{"id":2645,"date":"2026-10-24T08:44:03","date_gmt":"2026-10-24T08:44:03","guid":{"rendered":"https:\/\/wayhope.kro.kr\/?p=2645"},"modified":"2026-10-24T08:44:03","modified_gmt":"2026-10-24T08:44:03","slug":"javascript-%eb%b9%84%eb%8f%99%ea%b8%b0-%ec%b2%98%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/wayhope.kro.kr\/?p=2645","title":{"rendered":"JavaScript \ube44\ub3d9\uae30 \ucc98\ub9ac"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">JavaScript\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \ud558\ub098\uc758 \uba54\uc778 \uc2a4\ub808\ub4dc\uc5d0\uc11c \ucf54\ub4dc\ub97c \uc2e4\ud589\ud558\ub294 \uc2f1\uae00 \uc2a4\ub808\ub4dc \uae30\ubc18 \uc5b8\uc5b4\ub2e4. \uadf8\ub7f0\ub370\ub3c4 \ub124\ud2b8\uc6cc\ud06c \uc694\uccad, \ud30c\uc77c \uc785\ucd9c\ub825, \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c\uc640 \uac19\uc740 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ub3d9\uc548 \ub2e4\ub978 \uc791\uc5c5\uc744 \ucc98\ub9ac\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub7ec\ud55c \ub3d9\uc791\uc744 \uc774\ud574\ud558\ub824\uba74 \ub2e8\uc21c\ud788 <code>Promise<\/code>\ub098 <code>async\/await<\/code>\uc758 \ubb38\ubc95\uc744 \uc775\ud788\ub294 \uac83\ub9cc\uc73c\ub85c\ub294 \ubd80\uc871\ud558\ub2e4. <strong>\uc774\ubca4\ud2b8 \ub8e8\ud504(Event Loop), \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c(Microtask), \ud0dc\uc2a4\ud06c \ud050(Task Queue), \ube44\ub3d9\uae30 I\/O\uc758 \uc2e4\ud589 \uad6c\uc870<\/strong>\ub97c \ud568\uaed8 \uc774\ud574\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud2b9\ud788 Node.js \uae30\ubc18 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c, Redis \uce90\uc2dc \uc811\uadfc, WebSocket \uba54\uc2dc\uc9c0 \ucc98\ub9ac, \uc678\ubd80 API \ud638\ucd9c \ub4f1\uc774 \ube48\ubc88\ud558\uac8c \ubc1c\uc0dd\ud55c\ub2e4. \ube44\ub3d9\uae30 \ucc98\ub9ac\uc758 \uc6d0\ub9ac\ub97c \uc774\ud574\ud558\uc9c0 \ubabb\ud558\uba74 \uc694\uccad \uc9c0\uc5f0, \uc608\uc678 \ub204\ub77d, \uc0c1\ud0dc \ubcc0\uacbd \uacbd\uc7c1 \uc870\uac74\uacfc \uac19\uc740 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc5b4\ub835\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Promise\uc640 async\/await<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Promise\ub780?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Promise<\/code>\ub294 \ube44\ub3d9\uae30 \uc791\uc5c5\uc758 \uc644\ub8cc \ub610\ub294 \uc2e4\ud328 \uacb0\uacfc\ub97c \ub098\ud0c0\ub0b4\ub294 \uac1d\uccb4\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc77c\ubc18\uc801\uc778 \ub3d9\uae30 \ud568\uc218\ub294 \uc2e4\ud589 \uacb0\uacfc\ub97c \uc989\uc2dc \ubc18\ud658\ud55c\ub2e4. \ubc18\uba74 \ube44\ub3d9\uae30 \uc791\uc5c5\uc740 \uacb0\uacfc\uac00 \ub098\uc911\uc5d0 \ub3c4\ucc29\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c, \uacb0\uacfc\ub97c \ud45c\ud604\ud558\uace0 \ud6c4\uc18d \uc791\uc5c5\uc744 \uc5f0\uacb0\ud560 \uc218 \uc788\ub294 \ubcc4\ub3c4\uc758 \uad6c\uc870\uac00 \ud544\uc694\ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Promise\ub294 \ub2e4\uc74c \uc138 \uac00\uc9c0 \uc0c1\ud0dc\ub97c \uac00\uc9c4\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\uc0c1\ud0dc<\/th><th>\uc758\ubbf8<\/th><\/tr><tr><td>Pending<\/td><td>\uc791\uc5c5\uc774 \uc544\uc9c1 \uc644\ub8cc\ub418\uc9c0 \uc54a\uc74c<\/td><\/tr><tr><td>Fulfilled<\/td><td>\uc791\uc5c5\uc774 \uc131\uacf5\uc801\uc73c\ub85c \uc644\ub8cc\ub428<\/td><\/tr><tr><td>Rejected<\/td><td>\uc791\uc5c5\uc774 \uc2e4\ud328\ud568<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Promise\ub294 Pending \uc0c1\ud0dc\uc5d0\uc11c Fulfilled \ub610\ub294 Rejected \uc0c1\ud0dc\ub85c \uc804\ud658\ub41c\ub2e4. \ud55c \ubc88 \ud655\uc815\ub41c \uc0c1\ud0dc\ub294 \ub2e4\uc2dc \ubcc0\uacbd\ub418\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const promise = new Promise((resolve, reject) =&gt; {\n  const success = true;\n\n  if (success) {\n    resolve(\"\uc791\uc5c5 \uc131\uacf5\");\n  } else {\n    reject(new Error(\"\uc791\uc5c5 \uc2e4\ud328\"));\n  }\n});\n\npromise\n  .then((result) =&gt; {\n    console.log(result);\n  })\n  .catch((error) =&gt; {\n    console.error(error);\n  });<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>resolve()<\/code>\ub294 Promise\ub97c \uc131\uacf5 \uc0c1\ud0dc\ub85c \uc804\ud658\ud558\uace0, <code>reject()<\/code>\ub294 \uc2e4\ud328 \uc0c1\ud0dc\ub85c \uc804\ud658\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>then()<\/code>\uc740 \uc131\uacf5 \uacb0\uacfc\ub97c \ucc98\ub9ac\ud558\uace0, <code>catch()<\/code>\ub294 \uc2e4\ud328\ub97c \ucc98\ub9ac\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc Promise\ub97c \uc0dd\uc131\ud558\ub294 \uc21c\uac04 \uc791\uc5c5\uc774 \ubc18\ub4dc\uc2dc \ube44\ub3d9\uae30\ub85c \uc2e4\ud589\ub418\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4. <strong>Promise \uc0dd\uc131\uc790 \ub0b4\ubd80\uc758 \uc2e4\ud589 \ud568\uc218\ub294 \uc989\uc2dc \ub3d9\uae30\uc801\uc73c\ub85c \uc2e4\ud589\ub41c\ub2e4.<\/strong> \ube44\ub3d9\uae30 \uc791\uc5c5\uc758 \uc644\ub8cc\ub97c \uae30\ub2e4\ub9ac\ub294 \ud6c4\uc18d \ucf5c\ubc31\uc774 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub85c \ucc98\ub9ac\ub418\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(\"A\");\n\nconst promise = new Promise((resolve) =&gt; {\n  console.log(\"B\");\n  resolve(\"C\");\n});\n\npromise.then((value) =&gt; {\n  console.log(value);\n});\n\nconsole.log(\"D\");\n\n\/\/ \ucd9c\ub825\n\/\/ A\n\/\/ B\n\/\/ D\n\/\/ C<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Promise \uc0dd\uc131\uc790 \ub0b4\ubd80\uc758 <code>console.log(\"B\")<\/code>\ub294 \uc989\uc2dc \uc2e4\ud589\ub41c\ub2e4. \ubc18\uba74 <code>then()<\/code>\uc5d0 \ub4f1\ub85d\ud55c \ucf5c\ubc31\uc740 \ud604\uc7ac \ub3d9\uae30 \ucf54\ub4dc\uac00 \ub05d\ub09c \ud6c4 \uc2e4\ud589\ub41c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise \uccb4\uc774\ub2dd<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Promise\uc758 \uc911\uc694\ud55c \ud2b9\uc9d5 \uc911 \ud558\ub098\ub294 \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc5f0\uc18d\uc801\uc73c\ub85c \uc5f0\uacb0\ud560 \uc218 \uc788\ub2e4\ub294 \uc810\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>fetch(\"\/api\/user\")\n  .then((response) =&gt; {\n    if (!response.ok) {\n      throw new Error(\"\uc0ac\uc6a9\uc790 \uc870\ud68c \uc2e4\ud328\");\n    }\n\n    return response.json();\n  })\n  .then((user) =&gt; {\n    return fetch(`\/api\/inventory\/${user.id}`);\n  })\n  .then((response) =&gt; {\n    if (!response.ok) {\n      throw new Error(\"\uc778\ubca4\ud1a0\ub9ac \uc870\ud68c \uc2e4\ud328\");\n    }\n\n    return response.json();\n  })\n  .then((inventory) =&gt; {\n    console.log(\"\uc778\ubca4\ud1a0\ub9ac:\", inventory);\n  })\n  .catch((error) =&gt; {\n    console.error(\"\ucc98\ub9ac \uc2e4\ud328:\", error);\n  });<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac01 <code>then()<\/code>\uc740 \uc0c8\ub85c\uc6b4 Promise\ub97c \ubc18\ud658\ud55c\ub2e4. \ub530\ub77c\uc11c \uc774\uc804 \ub2e8\uacc4\uc758 \uacb0\uacfc\ub97c \ub2e4\uc74c \ub2e8\uacc4\uc5d0 \uc804\ub2ec\ud558\uba74\uc11c \uc791\uc5c5\uc744 \uc5f0\uacb0\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub610\ud55c \uccb4\uc778 \uc911\uac04\uc5d0\uc11c \uc608\uc678\uac00 \ubc1c\uc0dd\ud558\uba74 \uc774\ud6c4 \uc131\uacf5 \ucc98\ub9ac \ub2e8\uacc4\ub294 \uac74\ub108\ub6f0\uace0 \uac00\uc7a5 \uac00\uae4c\uc6b4 \ud6c4\uc18d \uc624\ub958 \ucc98\ub9ac \ub2e8\uacc4\ub85c \uc804\ub2ec\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \uad6c\uc870\ub294 \uc0ac\uc6a9\uc790 \uc870\ud68c \uc774\ud6c4 \uc778\ubca4\ud1a0\ub9ac \uc870\ud68c, \uacb0\uc81c \uac80\uc99d \uc774\ud6c4 \uc8fc\ubb38 \uc0dd\uc131\ucc98\ub7fc <strong>\uc791\uc5c5 \uac04 \uc120\ud6c4 \uad00\uacc4\uac00 \uc874\uc7ac\ud558\ub294 \ube44\ub3d9\uae30 \ud750\ub984<\/strong>\uc5d0 \uc720\uc6a9\ud558\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">async\/await\ub780?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>async\/await<\/code>\ub294 Promise \uae30\ubc18 \ube44\ub3d9\uae30 \ucc98\ub9ac\ub97c \ub3d9\uae30 \ucf54\ub4dc\uc640 \uc720\uc0ac\ud55c \ud615\ud0dc\ub85c \uc791\uc131\ud560 \uc218 \uc788\ub3c4\ub85d \ud574\uc8fc\ub294 \ubb38\ubc95\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function getUserInventory(userId) {\n  const response = await fetch(`\/api\/inventory\/${userId}`);\n\n  if (!response.ok) {\n    throw new Error(\"\uc778\ubca4\ud1a0\ub9ac \uc870\ud68c \uc2e4\ud328\");\n  }\n\n  const inventory = await response.json();\n\n  return inventory;\n}\n\ngetUserInventory(\"user-001\")\n  .then((inventory) =&gt; {\n    console.log(inventory);\n  })\n  .catch((error) =&gt; {\n    console.error(error);\n  });<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>async<\/code> \ud568\uc218\ub294 \ud56d\uc0c1 Promise\ub97c \ubc18\ud658\ud55c\ub2e4. \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c \uc77c\ubc18 \uac12\uc744 \ubc18\ud658\ud574\ub3c4 \ud574\ub2f9 \uac12\uc740 \uc774\ud589\ub41c Promise\uc758 \uacb0\uacfc\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>await<\/code>\ub294 Promise\uac00 \uc644\ub8cc\ub420 \ub54c\uae4c\uc9c0 \ud574\ub2f9 \ube44\ub3d9\uae30 \ud568\uc218\uc758 \ub2e4\uc74c \uc2e4\ud589\uc744 \uc77c\uc2dc \uc911\ub2e8\ud55c\ub2e4. \uc774\ub54c <strong>JavaScript \uba54\uc778 \uc2a4\ub808\ub4dc \uc804\uccb4\uac00 \uba48\ucd94\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/strong> \ud568\uc218\uc758 \uc2e4\ud589\uc774 \uc911\ub2e8\ub41c \ub3d9\uc548 \ub2e4\ub978 \uc791\uc5c5\uc774 \uc2e4\ud589\ub420 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c\ub97c \uae30\ub2e4\ub9ac\ub294 \ub3d9\uc548 \ub2e4\ub978 \uc0ac\uc6a9\uc790\uc758 WebSocket \uba54\uc2dc\uc9c0\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\ub2e4. \ub2e8, \uc774\ub294 \ud574\ub2f9 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ub4dc\ub77c\uc774\ubc84\uac00 \uc2e4\uc81c\ub85c \ube44\ub3d9\uae30 I\/O\ub97c \uc81c\uacf5\ud558\uace0, \ub2e4\ub978 \uc791\uc5c5\uc744 \ub9c9\ub294 \ub3d9\uae30 \ucf54\ub4dc\uac00 \uc5c6\ub2e4\ub294 \uc804\uc81c\uc5d0\uc11c \uc131\ub9bd\ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">async\/await\uc640 Promise\uc758 \uad00\uacc4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>async\/await<\/code>\ub294 Promise\ub97c \ub300\uccb4\ud558\ub294 \ubcc4\uac1c\uc758 \ube44\ub3d9\uae30 \uc2dc\uc2a4\ud15c\uc774 \uc544\ub2c8\ub2e4. Promise\ub97c \uae30\ubc18\uc73c\ub85c \ub3d9\uc791\ud558\ub294 \ubb38\ubc95\uc774\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\uad6c\ubd84<\/th><th>Promise \uccb4\uc774\ub2dd<\/th><th>async\/await<\/th><\/tr><tr><td>\uc791\uc131 \ubc29\uc2dd<\/td><td><code>then()<\/code>\uc73c\ub85c \uc5f0\uacb0<\/td><td><code>await<\/code>\ub85c \uc21c\ucc28 \ud45c\ud604<\/td><\/tr><tr><td>\uc624\ub958 \ucc98\ub9ac<\/td><td><code>catch()<\/code><\/td><td><code>try\/catch<\/code><\/td><\/tr><tr><td>\uc21c\ucc28 \uc791\uc5c5<\/td><td>\uccb4\uc774\ub2dd\uc73c\ub85c \ud45c\ud604<\/td><td>\ub3d9\uae30 \ucf54\ub4dc\ucc98\ub7fc \ud45c\ud604<\/td><\/tr><tr><td>\ubcd1\ub82c \uc791\uc5c5<\/td><td><code>Promise.all()<\/code> \ub4f1<\/td><td>\ub3d9\uc77c\ud558\uac8c \uc0ac\uc6a9 \uac00\ub2a5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ub458 \uc911 \uc5b4\ub290 \ubc29\uc2dd\uc774 \ud56d\uc0c1 \ub354 \ube60\ub978 \uac83\uc740 \uc544\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c \uc791\uc5c5\uc758 \uc120\ud6c4 \uad00\uacc4\uac00 \uba85\ud655\ud558\uba74 <code>async\/await<\/code>\uac00 \uc77d\uae30 \uc27d\uace0, \uc5ec\ub7ec Promise\ub97c \uc870\ud569\ud560 \ub54c\ub294 <code>Promise.all()<\/code>\uacfc \uac19\uc740 \uae30\ub2a5\uc774 \uc720\uc6a9\ud558\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc21c\ucc28 \uc2e4\ud589\uacfc \ubcd1\ub82c \uc2e4\ud589<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ube44\ub3d9\uae30 \ucf54\ub4dc\uc5d0\uc11c \uc790\uc8fc \ubc1c\uc0dd\ud558\ub294 \uc131\ub2a5 \ubb38\uc81c\ub294 \uc11c\ub85c \ub3c5\ub9bd\uc801\uc778 \uc791\uc5c5\uc744 \ubd88\ud544\uc694\ud558\uac8c \uc21c\ucc28 \uc2e4\ud589\ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function loadPlayerData(userId) {\n  const profile = await getProfile(userId);\n  const inventory = await getInventory(userId);\n  const quests = await getQuests(userId);\n\n  return { profile, inventory, quests };\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc138 \uc791\uc5c5\uc774 \uc11c\ub85c \ub3c5\ub9bd\uc801\uc774\ub77c\uba74 \uccab \ubc88\uc9f8 \uc791\uc5c5\uc774 \ub05d\ub09c \ud6c4 \ub450 \ubc88\uc9f8 \uc791\uc5c5\uc744 \uc2dc\uc791\ud560 \uc774\uc720\uac00 \uc5c6\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function loadPlayerData(userId) {\n  const &#91;profile, inventory, quests] = await Promise.all(&#91;\n    getProfile(userId),\n    getInventory(userId),\n    getQuests(userId),\n  ]);\n\n  return { profile, inventory, quests };\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Promise.all()<\/code>\uc740 \uc804\ub2ec\ub41c Promise\ub4e4\uc744 \ubcd1\ub82c\ub85c \uc9c4\ud589\uc2dc\ud0a4\uace0 \ubaa8\ub4e0 \uc791\uc5c5\uc774 \uc131\uacf5\ud558\uba74 \uacb0\uacfc\ub97c \ubc30\uc5f4\ub85c \ubc18\ud658\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud558\ub098\ub77c\ub3c4 \uac70\ubd80\ub418\uba74 \ubc18\ud658\ub41c Promise\ub294 \uac70\ubd80\ub41c\ub2e4. \ub2e4\ub9cc \ub098\uba38\uc9c0 \uc791\uc5c5\uc774 \uc790\ub3d9\uc73c\ub85c \ucde8\uc18c\ub418\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\uae30\uc11c \ubcd1\ub82c \uc2e4\ud589\uc740 \uc5ec\ub7ec \uc791\uc5c5\uc744 \ub3d9\uc2dc\uc5d0 \uc9c4\ud589\ud55c\ub2e4\ub294 \uc758\ubbf8\ub2e4. JavaScript \ucf5c\ubc31\uc774 \uba54\uc778 \uc2a4\ub808\ub4dc\uc5d0\uc11c \ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ub41c\ub2e4\ub294 \ub73b\uc740 \uc544\ub2c8\ub2e4. \uc2e4\uc81c I\/O\uc758 \ub3d9\uc2dc\uc131\uc740 \ub7f0\ud0c0\uc784\uacfc \ud574\ub2f9 API\uc758 \uad6c\ud604 \ubc29\uc2dd\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\ub300\ub85c \uc791\uc5c5 \uac04 \uc758\uc874\uc131\uc774 \uc788\ub2e4\uba74 \uc21c\ucc28 \uc2e4\ud589\uc774 \ud544\uc694\ud558\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function purchaseItem(userId, itemId) {\n  const player = await getPlayer(userId);\n\n  const item = await getItem(itemId);\n\n  return createPurchase(player, item);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \uacbd\uc6b0 <code>getPlayer()<\/code>\uc640 <code>getItem()<\/code>\uc774 \uc11c\ub85c \ub3c5\ub9bd\uc801\uc778\uc9c0, \uc774\ud6c4 \uc791\uc5c5\uc5d0 \uc55e\uc120 \uacb0\uacfc\uac00 \ud544\uc694\ud55c\uc9c0\ub97c \ud655\uc778\ud55c \ub4a4 \uc2e4\ud589 \uad6c\uc870\ub97c \uacb0\uc815\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uc774\ubca4\ud2b8 \ub8e8\ud504\uc640 \ube44\ub3d9\uae30 I\/O<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">JavaScript\uc758 \uc2e4\ud589 \uad6c\uc870<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript\uc758 \ube44\ub3d9\uae30 \ucc98\ub9ac\ub97c \uc774\ud574\ud558\ub824\uba74 \ub2e4\uc74c \uad6c\uc131 \uc694\uc18c\ub97c \uad6c\ubd84\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Call Stack:<\/strong> \ud604\uc7ac \uc2e4\ud589 \uc911\uc778 \ud568\uc218\uc640 \uc2e4\ud589 \ucee8\ud14d\uc2a4\ud2b8\ub97c \uad00\ub9ac\ud55c\ub2e4.<\/li>\n\n\n\n<li><strong>Heap:<\/strong> \uac1d\uccb4\uc640 \ud568\uc218 \ub4f1 \ub3d9\uc801\uc73c\ub85c \ud560\ub2f9\ub418\ub294 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud55c\ub2e4.<\/li>\n\n\n\n<li><strong>Host APIs:<\/strong> \ub7f0\ud0c0\uc784\uc774 \uc81c\uacf5\ud558\ub294 \ud0c0\uc774\uba38, \ub124\ud2b8\uc6cc\ud06c, \ud30c\uc77c \uc2dc\uc2a4\ud15c \ub4f1\uc758 \uae30\ub2a5\uc774\ub2e4.<\/li>\n\n\n\n<li><strong>Task Queue:<\/strong> \ud0dc\uc2a4\ud06c \uc2e4\ud589\uc744 \uae30\ub2e4\ub9ac\ub294 \uc791\uc5c5\uc744 \uad00\ub9ac\ud55c\ub2e4.<\/li>\n\n\n\n<li><strong>Microtask Queue:<\/strong> Promise \ubc18\uc751 \ucc98\ub9ac\uc640 \uac19\uc740 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub97c \uad00\ub9ac\ud55c\ub2e4.<\/li>\n\n\n\n<li><strong>Event Loop:<\/strong> \uc2e4\ud589 \uac00\ub2a5\ud55c \uc791\uc5c5\uc744 \uc120\ud0dd\ud574 \uc9c4\ud589\ud558\ub294 \uc2e4\ud589 \ubaa8\ub378\uc758 \ud575\uc2ec \uc694\uc18c\ub2e4.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ube0c\ub77c\uc6b0\uc800\uc640 Node.js\ub294 \ub7f0\ud0c0\uc784\uc758 \uc138\ubd80 \uad6c\uc870\uac00 \ub2e4\ub974\uc9c0\ub9cc, \uacf5\ud1b5\uc801\uc73c\ub85c \ud604\uc7ac \uc2e4\ud589 \uc911\uc778 JavaScript \ucf54\ub4dc\uac00 \ub05d\ub09c \ub4a4 \ub300\uae30 \uc911\uc778 \uc791\uc5c5\uc744 \ucc98\ub9ac\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c \ube44\ub3d9\uae30 \ub3d9\uc791\uc744 \uc81c\uacf5\ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc774\ubca4\ud2b8 \ub8e8\ud504\uc758 \ub3d9\uc791 \uc6d0\ub9ac<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\uc74c \ucf54\ub4dc\ub97c \uc0b4\ud3b4\ubcf4\uc790.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(\"A\");\n\nsetTimeout(() =&gt; {\n  console.log(\"B\");\n}, 0);\n\nPromise.resolve().then(() =&gt; {\n  console.log(\"C\");\n});\n\nconsole.log(\"D\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc77c\ubc18\uc801\uc778 \ube0c\ub77c\uc6b0\uc800 \ud658\uacbd\uc5d0\uc11c \ucd9c\ub825 \uc21c\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A\nD\nC\nB<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\uc720\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><code>console.log(\"A\")<\/code>\ub97c \uc2e4\ud589\ud55c\ub2e4.<\/li>\n\n\n\n<li><code>setTimeout()<\/code>\uc758 \ucf5c\ubc31\uc744 \ud0c0\uc774\uba38 \ud0dc\uc2a4\ud06c\ub85c \uc608\uc57d\ud55c\ub2e4.<\/li>\n\n\n\n<li>Promise\uc758 <code>then()<\/code> \ucf5c\ubc31\uc744 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub85c \uc608\uc57d\ud55c\ub2e4.<\/li>\n\n\n\n<li><code>console.log(\"D\")<\/code>\ub97c \uc2e4\ud589\ud55c\ub2e4.<\/li>\n\n\n\n<li>\ud604\uc7ac \ub3d9\uae30 \uc2e4\ud589\uc774 \ub05d\ub098\uba74 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub97c \ucc98\ub9ac\ud55c\ub2e4.<\/li>\n\n\n\n<li>\uc774\ud6c4 \uc2e4\ud589 \uac00\ub2a5\ud55c \ud0c0\uc774\uba38 \ud0dc\uc2a4\ud06c\ub97c \ucc98\ub9ac\ud55c\ub2e4.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><code>setTimeout(callback, 0)<\/code>\uc740 \ucf5c\ubc31\uc744 \uc989\uc2dc \uc2e4\ud589\ud558\ub77c\ub294 \uc758\ubbf8\uac00 \uc544\ub2c8\ub2e4. \ucd5c\uc18c \uc9c0\uc5f0 \uc2dc\uac04 \uc870\uac74\uc744 \ub9cc\uc871\ud55c \ub4a4 \uc2e4\ud589 \uac00\ub2a5\ud55c \ud0dc\uc2a4\ud06c\ub85c \ub4f1\ub85d\ud55c\ub2e4\ub294 \uc758\ubbf8\ub2e4. \uc2e4\uc81c \uc2e4\ud589 \uc2dc\uc810\uc740 \ud604\uc7ac \uc791\uc5c5\uacfc \ub7f0\ud0c0\uc784\uc758 \uc2a4\ucf00\uc904\ub9c1\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ube44\ub3d9\uae30 I\/O\ub294 \uc5b4\ub5bb\uac8c \ucc98\ub9ac\ub418\ub294\uac00?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ub124\ud2b8\uc6cc\ud06c \uc694\uccad\uc774\ub098 \ud30c\uc77c \uc77d\uae30\ub97c \uc218\ud589\ud560 \ub54c JavaScript\uac00 \ubaa8\ub4e0 \ub300\uae30 \uc2dc\uac04\uc744 \uc9c1\uc811 \uc810\uc720\ud55c\ub2e4\uba74, \uc11c\ubc84\ub294 \ud55c \uc791\uc5c5\uc774 \ub05d\ub0a0 \ub54c\uae4c\uc9c0 \ub2e4\ub978 \uc694\uccad\uc744 \ucc98\ub9ac\ud558\uae30 \uc5b4\ub824\uc6cc\uc9c4\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ube44\ub3d9\uae30 I\/O\ub294 \ub7f0\ud0c0\uc784\uacfc \uc6b4\uc601\uccb4\uc81c \ub610\ub294 \ub7f0\ud0c0\uc784 \ub0b4\ubd80\uc758 \uc791\uc5c5 \ucc98\ub9ac \uba54\ucee4\ub2c8\uc998\uc744 \ud65c\uc6a9\ud574 \uc774\ub7ec\ud55c \ub300\uae30\ub97c \ud6a8\uc728\uc801\uc73c\ub85c \uad00\ub9ac\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4 Node.js\uc5d0\uc11c \ud30c\uc77c\uc744 \ube44\ub3d9\uae30\ub85c \uc77d\ub294 \uacbd\uc6b0\ub97c \uc0b4\ud3b4\ubcf4\uc790.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const fs = require(\"node:fs\");\n\nconsole.log(\"\ud30c\uc77c \uc77d\uae30 \uc2dc\uc791\");\n\nfs.readFile(\".\/data.json\", \"utf8\", (error, data) =&gt; {\n  if (error) {\n    console.error(\"\ud30c\uc77c \uc77d\uae30 \uc2e4\ud328:\", error);\n    return;\n  }\n\n  console.log(\"\ud30c\uc77c \ub0b4\uc6a9:\", data);\n});\n\nconsole.log(\"\ub2e4\ub978 \uc791\uc5c5 \uc2e4\ud589\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac00\ub2a5\ud55c \ucd9c\ub825 \uc21c\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\ud30c\uc77c \uc77d\uae30 \uc2dc\uc791\n\ub2e4\ub978 \uc791\uc5c5 \uc2e4\ud589\n\ud30c\uc77c \ub0b4\uc6a9: ...<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud30c\uc77c \uc77d\uae30\uac00 \uc644\ub8cc\ub418\uae30 \uc804\uc5d0 \ub2e4\ub978 JavaScript \ucf54\ub4dc\ub97c \uc2e4\ud589\ud560 \uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Node.js\uc758 \ud30c\uc77c \uc2dc\uc2a4\ud15c API\ub294 \ub0b4\ubd80\uc801\uc73c\ub85c libuv\uc758 \uc2a4\ub808\ub4dc \ud480 \ub4f1\uc744 \ud65c\uc6a9\ud560 \uc218 \uc788\ub2e4. \ub124\ud2b8\uc6cc\ud06c I\/O\ub294 \uc6b4\uc601\uccb4\uc81c\uc758 \ube44\ub3d9\uae30 I\/O \ubc0f \uc774\ubca4\ud2b8 \ud1b5\uc9c0 \uba54\ucee4\ub2c8\uc998 \ub4f1\uc744 \ud65c\uc6a9\ud55c\ub2e4. \ubaa8\ub4e0 \ube44\ub3d9\uae30 \uc791\uc5c5\uc774 \ub3d9\uc77c\ud55c \uc2a4\ub808\ub4dc \ud480\uc5d0\uc11c \ucc98\ub9ac\ub418\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ud575\uc2ec\uc740 <strong>\ube44\ub3d9\uae30 I\/O\uac00 \ub300\uae30 \uc2dc\uac04\uc744 \ud65c\uc6a9\ud574 \ub2e4\ub978 \uc791\uc5c5\uc744 \uc9c4\ud589\ud560 \uc218 \uc788\ub3c4\ub85d \ud55c\ub2e4\ub294 \uac83<\/strong>\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc \ube44\ub3d9\uae30 \ud568\uc218 \ub0b4\ubd80\uc5d0\uc11c CPU\ub97c \uc624\ub798 \uc810\uc720\ud558\ub294 \uacc4\uc0b0\uc744 \uc2e4\ud589\ud558\uba74 \uc774\uc57c\uae30\uac00 \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function calculate() {\n  let result = 0;\n\n  for (let i = 0; i &lt; 10_000_000_000; i++) {\n    result += i;\n  }\n\n  return result;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \ud568\uc218\ub294 <code>async<\/code>\ub85c \uc120\uc5b8\ub418\uc5b4 \uc788\uc9c0\ub9cc \ubc18\ubcf5\ubb38\uc740 \ub3d9\uae30\uc801\uc73c\ub85c \uc2e4\ud589\ub41c\ub2e4. <code>await<\/code>\uac00 \uc5c6\ub294 CPU \uc9d1\uc57d\uc801\uc778 \uc791\uc5c5\uc740 \uba54\uc778 \uc2a4\ub808\ub4dc\ub97c \uc810\uc720\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub530\ub77c\uc11c CPU \uc9d1\uc57d\uc801\uc778 \uacc4\uc0b0\uc740 \uc791\uc5c5\uc744 \ubd84\ud560\ud558\uac70\ub098 Node.js\uc758 <code>worker_threads<\/code> \ub4f1 \ubcc4\ub3c4\uc758 \uc2e4\ud589 \uc218\ub2e8\uc744 \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\uc640 \ud0dc\uc2a4\ud06c \ud050<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\ud0dc\uc2a4\ud06c\uc640 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\uc758 \ucc28\uc774<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript \ub7f0\ud0c0\uc784\uc740 \ubaa8\ub4e0 \ube44\ub3d9\uae30 \ucf5c\ubc31\uc744 \ud558\ub098\uc758 \ud050\uc5d0\uc11c \ub3d9\uc77c\ud558\uac8c \ucc98\ub9ac\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ube0c\ub77c\uc6b0\uc800\uc758 \uc77c\ubc18\uc801\uc778 \uc774\ubca4\ud2b8 \ub8e8\ud504\uc5d0\uc11c\ub294 \ud0dc\uc2a4\ud06c\ub97c \ucc98\ub9ac\ud55c \ub4a4 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub97c \ube44\uc6b0\ub294 \ub3d9\uc791\uc774 \uc911\uc694\ud558\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>\uad6c\ubd84<\/th><th>\ud0dc\uc2a4\ud06c(Task)<\/th><th>\ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c(Microtask)<\/th><\/tr><tr><td>\ub300\ud45c\uc801\uc778 \uc608<\/td><td>\ud0c0\uc774\uba38 \ucf5c\ubc31, \uc77c\ubd80 \uc774\ubca4\ud2b8 \ucf5c\ubc31<\/td><td><code>Promise.then()<\/code>, <code>queueMicrotask()<\/code><\/td><\/tr><tr><td>\uc2e4\ud589 \uc2dc\uc810<\/td><td>\uc774\ubca4\ud2b8 \ub8e8\ud504\uac00 \ud574\ub2f9 \ud0dc\uc2a4\ud06c\ub97c \uc120\ud0dd\ud560 \ub54c<\/td><td>\ud604\uc7ac \uc2e4\ud589\uc774 \ub05d\ub09c \ub4a4 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c \ucc98\ub9ac \uc2dc<\/td><\/tr><tr><td>\ucc98\ub9ac \ubc29\uc2dd<\/td><td>\ud0dc\uc2a4\ud06c \ub2e8\uc704\ub85c \uc2e4\ud589<\/td><td>\uc77c\ubc18\uc801\uc73c\ub85c \ud050\uac00 \ube4c \ub54c\uae4c\uc9c0 \ucc98\ub9ac<\/td><\/tr><tr><td>\uc8fc\uc694 \ud2b9\uc9d5<\/td><td>\ub2e4\ub978 \ud0dc\uc2a4\ud06c\uc640 \uc2e4\ud589 \uc21c\uc11c\ub97c \uc870\uc728<\/td><td>\ub2e4\uc74c \ud0dc\uc2a4\ud06c\ubcf4\ub2e4 \uba3c\uc800 \ucc98\ub9ac\ub420 \uc218 \uc788\uc74c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\ube0c\ub77c\uc6b0\uc800\uc5d0\uc11c\ub294 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c \ud050\uac00 \ube44\uc6cc\uc9c4 \ud6c4 \ub80c\ub354\ub9c1\uc774 \uc774\ub8e8\uc5b4\uc9c8 \uc218 \uc788\ub2e4. \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub97c \ubb34\ud55c\ud788 \ucd94\uac00\ud558\uba74 \ub80c\ub354\ub9c1\uc774\ub098 \ub2e4\uc74c \ud0dc\uc2a4\ud06c\uac00 \uc9c0\uc5f0\ub420 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\uc758 \uc2e4\ud589 \uc21c\uc11c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(\"A\");\n\nsetTimeout(() =&gt; {\n  console.log(\"B\");\n}, 0);\n\nPromise.resolve().then(() =&gt; {\n  console.log(\"C\");\n});\n\nqueueMicrotask(() =&gt; {\n  console.log(\"D\");\n});\n\nconsole.log(\"E\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc77c\ubc18\uc801\uc778 \ube0c\ub77c\uc6b0\uc800 \ud658\uacbd\uc5d0\uc11c \ucd9c\ub825 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A\nE\nC\nD\nB<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc2e4\ud589 \uc21c\uc11c\ub97c \ubd84\uc11d\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>A<\/code>, <code>E<\/code>\ub294 \ub3d9\uae30 \ucf54\ub4dc\uc774\ubbc0\ub85c \uba3c\uc800 \uc2e4\ud589\ub41c\ub2e4.<\/li>\n\n\n\n<li><code>C<\/code>\uc640 <code>D<\/code>\ub294 \uac01\uac01 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c \ud050\uc5d0 \ub4f1\ub85d\ub41c\ub2e4.<\/li>\n\n\n\n<li>\uba3c\uc800 \ub4f1\ub85d\ub41c <code>C<\/code>\uac00 \uc2e4\ud589\ub418\uace0 \ub2e4\uc74c\uc73c\ub85c <code>D<\/code>\uac00 \uc2e4\ud589\ub41c\ub2e4.<\/li>\n\n\n\n<li>\uc774\ud6c4 \ud0c0\uc774\uba38 \ucf5c\ubc31\uc778 <code>B<\/code>\uac00 \uc2e4\ud589\ub41c\ub2e4.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\uae30\uc11c \uc911\uc694\ud55c \uc810\uc740 Promise \ucf5c\ubc31\uc774 \ub4f1\ub85d \uc989\uc2dc \uc2e4\ud589\ub418\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83\uc774\ub2e4. \ud604\uc7ac \uc2e4\ud589 \uc911\uc778 \ub3d9\uae30 \ucf54\ub4dc\uac00 \ub05d\ub09c \ub4a4 \uc2e4\ud589\ub41c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\uac00 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub97c \uc0dd\uc131\ud558\ub294 \uacbd\uc6b0<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(\"A\");\n\nPromise.resolve().then(() =&gt; {\n  console.log(\"B\");\n\n  Promise.resolve().then(() =&gt; {\n    console.log(\"C\");\n  });\n});\n\nPromise.resolve().then(() =&gt; {\n  console.log(\"D\");\n});\n\nconsole.log(\"E\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ucd9c\ub825 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A\nE\nB\nD\nC<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ucc98\uc74c\uc5d0\ub294 <code>B<\/code>\uc640 <code>D<\/code>\uac00 \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c \ud050\uc5d0 \ub4f1\ub85d\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>B<\/code>\uac00 \uc2e4\ud589\ub418\uba74\uc11c <code>C<\/code>\ub97c \uc0c8\ub85c \ub4f1\ub85d\ud55c\ub2e4. \ud558\uc9c0\ub9cc <code>D<\/code>\ub294 \uc774\ubbf8 \ud050\uc5d0\uc11c \ub300\uae30 \uc911\uc774\ubbc0\ub85c <code>C<\/code>\ubcf4\ub2e4 \uba3c\uc800 \uc2e4\ud589\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub530\ub77c\uc11c \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub294 \ud558\ub098\uc529 \uc2e4\ud589\ub418\uba70, \uc2e4\ud589 \ub3c4\uc911 \uc0c8\ub86d\uac8c \ub4f1\ub85d\ub41c \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ub3c4 \ud050\uc758 \uc21c\uc11c\uc5d0 \ub530\ub77c \ucc98\ub9ac\ub41c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Node.js\uc758 \ud050 \ucc98\ub9ac\uc5d0\uc11c \uc8fc\uc758\ud560 \uc810<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Node.js\uc5d0\ub294 \ube0c\ub77c\uc6b0\uc800\uc758 \uc774\ubca4\ud2b8 \ub8e8\ud504\uc640 \ub2e4\ub978 \uc138\ubd80 \uc2e4\ud589 \uaddc\uce59\uc774 \uc874\uc7ac\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc608\ub97c \ub4e4\uc5b4 Node.js\ub294 <code>process.nextTick()<\/code>\uc744 \uc704\ud55c \ubcc4\ub3c4\uc758 \ud050\ub97c \uad00\ub9ac\ud55c\ub2e4. \uc77c\ubc18\uc801\uc778 Node.js \ud658\uacbd\uc5d0\uc11c\ub294 <code>process.nextTick()<\/code> \ucf5c\ubc31\uc774 Promise \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c\ubcf4\ub2e4 \uba3c\uc800 \ucc98\ub9ac\ub418\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub610\ud55c CommonJS\uc640 ES Modules\uc758 \uc2e4\ud589 \ub9e5\ub77d\uc5d0 \ub530\ub77c \uad00\ucc30\ub418\ub294 \uc21c\uc11c\uac00 \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub530\ub77c\uc11c \ube0c\ub77c\uc6b0\uc800\uc5d0\uc11c \uad00\ucc30\ud55c \uc2e4\ud589 \uc21c\uc11c\ub97c Node.js\uc5d0 \uadf8\ub300\ub85c \uc801\uc6a9\ud574\uc11c\ub294 \uc548 \ub41c\ub2e4. \uc815\ud655\ud55c \ub3d9\uc791\uc744 \ud655\uc778\ud558\ub824\uba74 \uc2e4\ud589 \ud658\uacbd\uacfc \ubaa8\ub4c8 \uc2dc\uc2a4\ud15c\uc744 \ud568\uaed8 \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uc624\ub958 \uc804\ud30c\uc640 \uc608\uc678 \ucc98\ub9ac<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\ube44\ub3d9\uae30 \ucf54\ub4dc\ub294 \uc2e4\ud589 \uc2dc\uc810\uacfc \uc624\ub958 \ubc1c\uc0dd \uc2dc\uc810\uc774 \ub2e4\ub97c \uc218 \uc788\ub2e4. \ub530\ub77c\uc11c \ub3d9\uae30 \ucf54\ub4dc\uc758 <code>try\/catch<\/code>\ub9cc\uc73c\ub85c \ubaa8\ub4e0 \ube44\ub3d9\uae30 \uc624\ub958\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">try\/catch\uc640 await<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>await<\/code>\ub97c \uc0ac\uc6a9\ud558\ub294 \ube44\ub3d9\uae30 \ud568\uc218\uc5d0\uc11c\ub294 <code>try\/catch<\/code>\ub85c Promise \uac70\ubd80\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function getPlayer(userId) {\n  try {\n    const player = await findPlayer(userId);\n\n    return player;\n  } catch (error) {\n    console.error(\"\ud50c\ub808\uc774\uc5b4 \uc870\ud68c \uc2e4\ud328:\", error);\n\n    throw error;\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>findPlayer()<\/code>\uac00 \uac70\ubd80\ub41c Promise\ub97c \ubc18\ud658\ud558\uba74 <code>await<\/code> \ud45c\ud604\uc2dd\uc5d0\uc11c \uc608\uc678\uac00 \ubc1c\uc0dd\ud55c \uac83\ucc98\ub7fc \ub3d9\uc791\ud55c\ub2e4. \ub530\ub77c\uc11c <code>catch<\/code> \ube14\ub85d\uc5d0\uc11c \uc624\ub958\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\uae30\uc11c \uc624\ub958\ub97c \uae30\ub85d\ud55c \ub4a4 <code>throw error<\/code>\ub97c \uc2e4\ud589\ud558\uba74 \ud638\ucd9c\uc790\uc5d0\uac8c\ub3c4 \uc624\ub958\uac00 \uc804\ud30c\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubc18\ub300\ub85c \uc624\ub958\ub97c \uae30\ub85d\ud55c \ud6c4 \uc544\ubb34\uac83\ub3c4 \ub2e4\uc2dc \ub358\uc9c0\uc9c0 \uc54a\uc73c\uba74 \ud568\uc218\ub294 \uc815\uc0c1\uc801\uc73c\ub85c \uc644\ub8cc\ub41c \uac83\uc73c\ub85c \ucc98\ub9ac\ub420 \uc218 \uc788\ub2e4. \uc774 \uacbd\uc6b0 \ud638\ucd9c\uc790\ub294 \uc870\ud68c \uc2e4\ud328\ub97c \uc131\uacf5\uacfc \uad6c\ubd84\ud558\uc9c0 \ubabb\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uc8fc\uc758\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">await \uc5c6\uc774 \ubc1c\uc0dd\ud558\ub294 \ube44\ub3d9\uae30 \uc624\ub958<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\uc74c \ucf54\ub4dc\ub294 \uc624\ub958 \ucc98\ub9ac\uc5d0 \uc2e4\ud328\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function loadData() {\n  try {\n    fetchData();\n  } catch (error) {\n    console.error(\"\uc624\ub958 \ubc1c\uc0dd:\", error);\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>fetchData()<\/code>\uac00 \ub098\uc911\uc5d0 \uac70\ubd80\ub418\ub294 Promise\ub97c \ubc18\ud658\ud558\ub354\ub77c\ub3c4, <code>await<\/code>\ud558\uc9c0 \uc54a\uc558\uae30 \ub54c\ubb38\uc5d0 \ud574\ub2f9 \uac70\ubd80\ub294 \uc704 <code>try\/catch<\/code>\uc5d0\uc11c \ucc98\ub9ac\ub418\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\uc74c\uacfc \uac19\uc774 \uc791\uc131\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function loadData() {\n  try {\n    const data = await fetchData();\n\n    return data;\n  } catch (error) {\n    console.error(\"\uc624\ub958 \ubc1c\uc0dd:\", error);\n\n    throw error;\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud575\uc2ec\uc740 <code>try\/catch<\/code>\uac00 \uc790\uc2e0\uc774 \uc2e4\ud589\ub418\ub294 \ubc94\uc704\uc5d0\uc11c \ubc1c\uc0dd\ud55c \uc608\uc678\uc640 <code>await<\/code>\ub97c \ud1b5\ud574 \uad00\ucc30\ud55c Promise \uac70\ubd80\ub97c \ucc98\ub9ac\ud55c\ub2e4\ub294 \uc810\uc774\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Promise \uccb4\uc774\ub2dd\uc5d0\uc11c\uc758 \uc624\ub958 \uc804\ud30c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>function processOrder() {\n  return validateOrder()\n    .then((order) =&gt; {\n      return saveOrder(order);\n    })\n    .then((savedOrder) =&gt; {\n      return publishOrderEvent(savedOrder);\n    })\n    .catch((error) =&gt; {\n      console.error(\"\uc8fc\ubb38 \ucc98\ub9ac \uc2e4\ud328:\", error);\n\n      throw error;\n    });\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc911\uac04 \ub2e8\uacc4\uc5d0\uc11c \uc608\uc678\uac00 \ubc1c\uc0dd\ud558\uac70\ub098 Promise\uac00 \uac70\ubd80\ub418\uba74 \uc774\ud6c4 \uc131\uacf5 \ucc98\ub9ac \ub2e8\uacc4\ub294 \uac74\ub108\ub6f0\uace0 <code>catch()<\/code>\ub85c \uc804\ub2ec\ub41c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>catch()<\/code> \ub0b4\ubd80\uc5d0\uc11c \uc608\uc678\ub97c \ub2e4\uc2dc \ub358\uc9c0\uba74 \ubc18\ud658\ub41c Promise\ub3c4 \uac70\ubd80 \uc0c1\ud0dc\uac00 \ub41c\ub2e4. \ub530\ub77c\uc11c \ucd5c\uc885 \ud638\ucd9c\uc790\ub3c4 \uc624\ub958\ub97c \ucc98\ub9ac\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>processOrder()\n  .then((result) =&gt; {\n    console.log(\"\uc8fc\ubb38 \ucc98\ub9ac \uacb0\uacfc:\", result);\n  })\n  .catch((error) =&gt; {\n    console.error(\"\ucd5c\uc885 \uc624\ub958 \ucc98\ub9ac:\", error);\n  });<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Promise.all\uc758 \uc624\ub958 \ucc98\ub9ac<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc5ec\ub7ec \uc791\uc5c5\uc744 \ub3d9\uc2dc\uc5d0 \uc218\ud589\ud558\ub294 \uacbd\uc6b0\uc5d0\ub3c4 \uc624\ub958 \ucc98\ub9ac \uc804\ub7b5\uc774 \ud544\uc694\ud558\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function loadGameData(userId) {\n  try {\n    const &#91;profile, inventory, quests] = await Promise.all(&#91;\n      getProfile(userId),\n      getInventory(userId),\n      getQuests(userId),\n    ]);\n\n    return { profile, inventory, quests };\n  } catch (error) {\n    console.error(\"\uac8c\uc784 \ub370\uc774\ud130 \ub85c\ub4dc \uc2e4\ud328:\", error);\n\n    throw error;\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Promise.all()<\/code>\uc740 \uc785\ub825 Promise \uc911 \ud558\ub098\ub77c\ub3c4 \uac70\ubd80\ub418\uba74 \ubc18\ud658\ub41c Promise\ub97c \uac70\ubd80\ud55c\ub2e4. \ud558\uc9c0\ub9cc \uc774\ubbf8 \uc2dc\uc791\ub41c \ub098\uba38\uc9c0 \uc791\uc5c5\uc744 \uc790\ub3d9\uc73c\ub85c \ucde8\uc18c\ud558\uc9c0\ub294 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uac01 \uc791\uc5c5\uc758 \uc131\uacf5\uacfc \uc2e4\ud328\ub97c \ub3c5\ub9bd\uc801\uc73c\ub85c \ud655\uc778\ud558\uace0 \uc2f6\ub2e4\uba74 <code>Promise.allSettled()<\/code>\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function loadOptionalGameData(userId) {\n  const results = await Promise.allSettled(&#91;\n    getProfile(userId),\n    getInventory(userId),\n    getQuests(userId),\n  ]);\n\n  return results.map((result) =&gt; {\n    if (result.status === \"fulfilled\") {\n      return {\n        success: true,\n        data: result.value,\n      };\n    }\n\n    return {\n      success: false,\n      error: result.reason,\n    };\n  });\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \ubc29\uc2dd\uc740 \uc77c\ubd80 \ub370\uc774\ud130\uac00 \uc2e4\ud328\ud574\ub3c4 \ub098\uba38\uc9c0 \uacb0\uacfc\ub97c \ud65c\uc6a9\ud574\uc57c \ud558\ub294 \uacbd\uc6b0\uc5d0 \uc801\ud569\ud558\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e8, \uacb0\uc81c \ucc98\ub9ac\ub098 \uc7ac\ud654 \uc9c0\uae09\ucc98\ub7fc \ubaa8\ub4e0 \uc791\uc5c5\uc774 \uc131\uacf5\ud574\uc57c \ud558\ub294 \ube44\uc988\ub2c8\uc2a4 \ub85c\uc9c1\uc5d0\uc11c\ub294 \ub2e8\uc21c\ud788 \uc2e4\ud328\ud55c \uc791\uc5c5\ub9cc \ubb34\uc2dc\ud574\uc11c\ub294 \uc548 \ub41c\ub2e4. \ud2b8\ub79c\uc7ad\uc158, \ubcf4\uc0c1 \ucc98\ub9ac, \uba71\ub4f1\uc131 \ub4f1\uc758 \ubcc4\ub3c4 \uc124\uacc4\uac00 \ud544\uc694\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc624\ub958\ub97c \uc5b4\ub514\uc11c \ucc98\ub9ac\ud574\uc57c \ud558\ub294\uac00?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc624\ub958 \ucc98\ub9ac\ub294 \ud06c\uac8c \uc138 \uac00\uc9c0 \uad00\uc810\uc5d0\uc11c \uc124\uacc4\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud558\uc704 \uacc4\uce35<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc5f0\uacb0 \uc624\ub958\ub098 \uc678\ubd80 API \uc751\ub2f5 \uc624\ub958\ub97c \uc2dd\ubcc4\ud558\uace0, \ud544\uc694\ud55c \uacbd\uc6b0 \uae30\uc220\uc801\uc778 \uc815\ubcf4\ub97c \ucd94\uac00\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\uc11c\ube44\uc2a4 \uacc4\uce35<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc720\uc2a4\ucf00\uc774\uc2a4\ub97c \uc911\ub2e8\ud574\uc57c \ud558\ub294\uc9c0, \uc7ac\uc2dc\ub3c4\ud574\uc57c \ud558\ub294\uc9c0, \ub300\uccb4 \ucc98\ub9ac\uac00 \uac00\ub2a5\ud55c\uc9c0 \ud310\ub2e8\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ucd5c\uc0c1\uc704 \uacbd\uacc4<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP \uc694\uccad \ud578\ub4e4\ub7ec\ub098 WebSocket \uba54\uc2dc\uc9c0 \ud578\ub4e4\ub7ec \ub4f1\uc5d0\uc11c \ucc98\ub9ac\ub418\uc9c0 \uc54a\uc740 \uc624\ub958\ub97c \uae30\ub85d\ud558\uace0 \uc801\uc808\ud55c \uc624\ub958 \uc751\ub2f5\uc744 \ubc18\ud658\ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ubaa8\ub4e0 \uacc4\uce35\uc5d0\uc11c \ub3d9\uc77c\ud55c \uc624\ub958\ub97c \ubb34\uc870\uac74 \uc7a1\uc544\uc11c \ub2e4\uc2dc \ub358\uc9c0\ub294 \uac83\uc740 \ubd88\ud544\uc694\ud558\ub2e4. \uc624\ub958\ub97c \uc2e4\uc81c\ub85c \ucc98\ub9ac\ud558\uac70\ub098 \uc758\ubbf8 \uc788\ub294 \uc815\ubcf4\ub97c \ucd94\uac00\ud558\ub294 \uc9c0\uc810\uc5d0\uc11c \uc7a1\ub294 \ud3b8\uc774 \ub0ab\ub2e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\uc2e4\uc2dc\uac04 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c\uc758 \ud65c\uc6a9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Node.js \uae30\ubc18 \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c\ub294 \ube44\ub3d9\uae30 \ucc98\ub9ac\uac00 \uc131\ub2a5\uacfc \ub370\uc774\ud130 \uc815\ud569\uc131\uc5d0 \uc9c1\uc811\uc801\uc778 \uc601\ud5a5\uc744 \uc900\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c\uc640 \uce90\uc2dc<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>async function getPlayerInventory(userId) {\n  const cacheKey = `inventory:${userId}`;\n\n  const cached = await redis.get(cacheKey);\n\n  if (cached !== null) {\n    return JSON.parse(cached);\n  }\n\n  const inventory = await inventoryRepository.findByUserId(userId);\n\n  if (inventory === null) {\n    throw new Error(\"\uc778\ubca4\ud1a0\ub9ac\ub97c \ucc3e\uc744 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.\");\n  }\n\n  await redis.set(\n    cacheKey,\n    JSON.stringify(inventory),\n    \"EX\",\n    300\n  );\n\n  return inventory;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uce90\uc2dc \uc870\ud68c\uac00 \ub05d\ub09c \ub4a4 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub97c \uc870\ud68c\ud558\ub294 \uac83\uc740 \uc758\ub3c4\uc801\uc778 \uc21c\ucc28 \ucc98\ub9ac\ub2e4. \uce90\uc2dc \uc801\uc911 \uc5ec\ubd80\uc5d0 \ub530\ub77c \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c\uac00 \ud544\uc694\ud560\uc9c0 \uacb0\uc815\ub418\uae30 \ub54c\ubb38\uc774\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub9cc \uce90\uc2dc \uc800\uc7a5 \uc2e4\ud328 \ub54c\ubb38\uc5d0 \uc815\uc0c1\uc801\uc778 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c \uacb0\uacfc\uae4c\uc9c0 \uc2e4\ud328 \ucc98\ub9ac\ud560 \uac83\uc778\uc9c0, \uce90\uc2dc\ub97c \uc120\ud0dd\uc801 \ucd5c\uc801\ud654 \uacc4\uce35\uc73c\ub85c \ucde8\uae09\ud560 \uac83\uc778\uc9c0\ub294 \uc11c\ube44\uc2a4\uc758 \uc694\uad6c\uc0ac\ud56d\uc5d0 \ub530\ub77c \uacb0\uc815\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ube44\ub3d9\uae30 \ucc98\ub9ac\uc640 \uacbd\uc7c1 \uc870\uac74<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\ube44\ub3d9\uae30 \ud568\uc218\ub294 \ucf54\ub4dc\uac00 \uc21c\ucc28\uc801\uc73c\ub85c \uc791\uc131\ub418\uc5b4 \uc788\uc5b4\ub3c4 \uc5ec\ub7ec \uc694\uccad\uc774 \uc11c\ub85c \uad50\ucc28\ud558\uc5ec \uc2e4\ud589\ub420 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let gold = 100;\n\nasync function purchaseItem(price) {\n  if (gold &lt; price) {\n    throw new Error(\"\uace8\ub4dc\uac00 \ubd80\uc871\ud569\ub2c8\ub2e4.\");\n  }\n\n  await savePurchaseLog(price);\n\n  gold -= price;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub450 \uc694\uccad\uc774 \uac70\uc758 \ub3d9\uc2dc\uc5d0 <code>purchaseItem(80)<\/code>\uc744 \ud638\ucd9c\ud558\uba74 \ub450 \uc694\uccad \ubaa8\ub450 <code>gold<\/code>\uac00 100\uc774\ub77c\uace0 \ud310\ub2e8\ud560 \uc218 \uc788\ub2e4. \uc774\ud6c4 \uac01\uac01 80\uc744 \ucc28\uac10\ud558\uba74\uc11c \uc798\ubabb\ub41c \uc0c1\ud0dc\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774\ub294 <code>await<\/code> \uc774\ud6c4\uc5d0 \ub2e4\uc2dc \uc2e4\ud589\ub41c\ub2e4\ub294 \uc0ac\uc2e4 \uc790\uccb4\uac00 \ubb38\uc81c\uac00 \uc544\ub2c8\ub77c, <strong>\uac80\uc99d\uacfc \uc0c1\ud0dc \ubcc0\uacbd \uc0ac\uc774\uc5d0 \ub2e4\ub978 \uc694\uccad\uc774 \ub07c\uc5b4\ub4e4 \uc218 \uc788\ub2e4\ub294 \uc810<\/strong>\uc774 \ubb38\uc81c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc2e4\uc81c \uac8c\uc784 \uc11c\ubc84\uc5d0\uc11c\ub294 \uc11c\ubc84 \uad8c\ud55c\uc744 \uc720\uc9c0\ud558\uba74\uc11c \uc7ac\ud654 \uac80\uc99d\uacfc \ucc28\uac10\uc744 \ud558\ub098\uc758 \uc6d0\uc790\uc801 \uc791\uc5c5\uc73c\ub85c \ucc98\ub9ac\ud574\uc57c \ud55c\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ud2b8\ub79c\uc7ad\uc158\uacfc \uc870\uac74\ubd80 \uac31\uc2e0, \uc801\uc808\ud55c \uc7a0\uae08 \ub610\ub294 Redis\uc758 \uc6d0\uc790\uc801 \uc5f0\uc0b0\uc744 \ud65c\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc694\uccad \ud578\ub4e4\ub7ec\uc5d0\uc11c\uc758 \uc624\ub958 \ucc98\ub9ac<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>async function handlePurchaseRequest(client, message) {\n  try {\n    const result = await purchaseItem(\n      client.userId,\n      message.itemId\n    );\n\n    client.send(\"purchase:success\", result);\n  } catch (error) {\n    console.error(\"\uad6c\ub9e4 \uc694\uccad \uc2e4\ud328:\", {\n      userId: client.userId,\n      itemId: message.itemId,\n      error,\n    });\n\n    client.send(\"purchase:error\", {\n      code: \"PURCHASE_FAILED\",\n      message: \"\uad6c\ub9e4\ub97c \ucc98\ub9ac\ud558\uc9c0 \ubabb\ud588\uc2b5\ub2c8\ub2e4.\",\n    });\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \uc608\uc81c\ub294 \uc694\uccad \ub2e8\uc704\uc5d0\uc11c \uc624\ub958\ub97c \ucc98\ub9ac\ud558\uace0 \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0 \uacb0\uacfc\ub97c \uc804\ub2ec\ud558\ub294 \uae30\ubcf8\uc801\uc778 \ud615\ud0dc\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uc2e4\uc81c \uc6b4\uc601 \ud658\uacbd\uc5d0\uc11c\ub294 \ub0b4\ubd80 \uc624\ub958 \uba54\uc2dc\uc9c0\ub97c \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0 \uadf8\ub300\ub85c \ub178\ucd9c\ud558\uc9c0 \uc54a\uace0, \uc624\ub958 \uc720\ud615\uc5d0 \ub530\ub77c <code>400<\/code>, <code>401<\/code>, <code>403<\/code>, <code>409<\/code>, <code>500<\/code> \ub4f1\uc758 \uc801\uc808\ud55c \uc751\ub2f5\uc774\ub098 \uac8c\uc784 \ud504\ub85c\ud1a0\ucf5c \uc624\ub958 \ucf54\ub4dc\ub97c \uc120\ud0dd\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\ub610\ud55c \uba54\uc2dc\uc9c0 \ud578\ub4e4\ub7ec\ub97c \ub4f1\ub85d\ud558\ub294 \ub77c\uc774\ube0c\ub7ec\ub9ac\uac00 \ubc18\ud658\ub41c Promise\uc758 \uac70\ubd80\ub97c \uc790\ub3d9\uc73c\ub85c \ucc98\ub9ac\ud558\ub294\uc9c0 \ud655\uc778\ud574\uc57c \ud55c\ub2e4. \ube44\ub3d9\uae30 \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\uc5d0\uc11c \ubc1c\uc0dd\ud55c \uc624\ub958\uac00 \ud638\ucd9c \uce21\uc73c\ub85c \uc790\ub3d9 \uc804\ud30c\ub41c\ub2e4\uace0 \uac00\uc815\ud574\uc11c\ub294 \uc548 \ub41c\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \ud558\ub098\uc758 \uba54\uc778 \uc2a4\ub808\ub4dc\uc5d0\uc11c \ucf54\ub4dc\ub97c \uc2e4\ud589\ud558\ub294 \uc2f1\uae00 \uc2a4\ub808\ub4dc \uae30\ubc18 \uc5b8\uc5b4\ub2e4. \uadf8\ub7f0\ub370\ub3c4 \ub124\ud2b8\uc6cc\ud06c \uc694\uccad, \ud30c\uc77c \uc785\ucd9c\ub825, \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc870\ud68c\uc640 \uac19\uc740 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ub3d9\uc548 \ub2e4\ub978 \uc791\uc5c5\uc744 \ucc98\ub9ac\ud560 \uc218 \uc788\ub2e4. \uc774\ub7ec\ud55c \ub3d9\uc791\uc744 \uc774\ud574\ud558\ub824\uba74 \ub2e8\uc21c\ud788 Promise\ub098 async\/await\uc758 \ubb38\ubc95\uc744 \uc775\ud788\ub294 \uac83\ub9cc\uc73c\ub85c\ub294 \ubd80\uc871\ud558\ub2e4. \uc774\ubca4\ud2b8 \ub8e8\ud504(Event Loop), \ub9c8\uc774\ud06c\ub85c\ud0dc\uc2a4\ud06c(Microtask), \ud0dc\uc2a4\ud06c \ud050(Task Queue), \ube44\ub3d9\uae30 I\/O\uc758 \uc2e4\ud589 \uad6c\uc870\ub97c \ud568\uaed8 \uc774\ud574\ud574\uc57c \ud55c\ub2e4. \ud2b9\ud788 Node.js \uae30\ubc18 \uac8c\uc784 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2645","post","type-post","status-publish","format-standard","hentry","category-dev-logs"],"_links":{"self":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2645","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2645"}],"version-history":[{"count":1,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2645\/revisions"}],"predecessor-version":[{"id":2646,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2645\/revisions\/2646"}],"wp:attachment":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}