async function sample() {\n \/\/ \u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\nawait \u306f\u3001 async\u95a2\u6570\u306e\u4e2d\u3067\u306e\u307f\u4f7f\u7528\u3067\u304d\u308b\u6f14\u7b97\u5b50\u3067\u3059\u3002
await\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5bfe\u8c61\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3066 Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8fd4\u3055\u308c\u308b\u307e\u3067\u3001\u95a2\u6570\u5185\u306e\u51e6\u7406\u304c\u4e00\u6642\u505c\u6b62\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\nasync function sample() {\n await \u51e6\u7406\u5185\u5bb9; \/\/ Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8fd4\u3055\u308c\u308b\u307e\u3067\u3053\u306e\u884c\u3067\u51e6\u7406\u304c\u4e00\u6642\u505c\u6b62\u3059\u308b\n}<\/code><\/pre><\/div>\n\n\n\nthen\u30e1\u30bd\u30c3\u30c9\u3092\u7e4b\u3044\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u9806\u306b\u5b9f\u884c\u3059\u308b\u306e\u3068\u540c\u3058\u51e6\u7406\u3092\u3001await\u3092\u4f7f\u3063\u3066\u3088\u308a\u898b\u3084\u3059\u304f\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\nasync function sample() {\n\n \/\/ \u4e0a\u304b\u3089\u9806\u306b\u5b9f\u884c\u3055\u308c\u308b\n await \u51e6\u7406\u5185\u5bb91; \n\n await \u51e6\u7406\u5185\u5bb92; \n\n await \u51e6\u7406\u5185\u5bb93; \n}<\/code><\/pre><\/div>\n\n\n\n“async\/await”\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b<\/h3>\n\n\n\n
\u305d\u308c\u3067\u306f\u3001\u5b9f\u969b\u306b async\/await \u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
async\u3092\u4f7f\u7528\u3057\u3066\u5ba3\u8a00\u3057\u305f\u975e\u540c\u671f\u95a2\u6570\u306f\u3001\u623b\u308a\u5024\u304c Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306a\u308a\u307e\u3059\u3002
\u95a2\u6570\u5185\u3067 return \u3092\u3057\u305f\u5834\u5408\u306f resolve \u3092\u5b9f\u884c\u3057\u3001\u4f8b\u5916\u51e6\u7406\u306a\u3069\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f reject \u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
return \u3067\u6307\u5b9a\u3057\u305f\u623b\u308a\u5024\u306f\u3001resolve\u306e\u5b9f\u884c\u6642\u306b\u5f15\u6570\u3092\u6e21\u3059\u306e\u3068\u540c\u3058\u3088\u3046\u306b\u6271\u308f\u308c\u307e\u3059\u3002
await \u3067 Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7d50\u679c\u3092\u5f85\u3064\u3053\u3068\u3067\u3001\u6307\u5b9a\u3057\u305f\u623b\u308a\u5024\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nasync function samlpeAsync() {\n return 5;\n}\n\nasync function asyncCall() {\n\n const num = await samlpeAsync(); \n console.log(num);\n}\n\nasyncCall();<\/code><\/pre><\/div>\n\n\n\n\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n5<\/code><\/pre><\/div>\n\n\n\n\u4e0a\u8a18\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e Promise.then \u3067\u5b9f\u884c\u3057\u305f\u5834\u5408\u3068\u540c\u3058\u5185\u5bb9\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nfunction samlpeAsync() {\n return new Promise((resolve, reject) => {\n resolve(5);\n });\n}\n\nsamlpeAsync().then(val => {\n console.log(val);\n});<\/code><\/pre><\/div>\n\n\n\nPromise.then\u3092\u4f7f\u308f\u305a\u306b\u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b<\/h3>\n\n\n\n
\u5192\u982d\u3067\u3001async\/await \u306f then\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u7b49\u306e\u51e6\u7406\u3092\u3088\u308a\u898b\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3067\u8a18\u8ff0\u3059\u308b\u65b9\u6cd5\u3060\u3068\u8aac\u660e\u3057\u307e\u3057\u305f\u3002
\u3053\u3053\u3067\u30012\u3064\u306e\u30b3\u30fc\u30c9\u306e\u9055\u3044\u3092\u5b9f\u969b\u306b\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u4f8b\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e2\u3064\u306e Promise \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u95a2\u6570\u3092\u3082\u3068\u306b\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nfunction wait2Seconds() {\n return new Promise(resolve => {\n setTimeout(() => {\n console.log("2\u79d2\u7d4c\u904e");\n resolve();\n }, 2000);\n });\n}\n\nfunction wait5Seconds() {\n return new Promise(resolve => {\n setTimeout(() => {\n console.log("5\u79d2\u7d4c\u904e");\n resolve();\n }, 5000);\n });\n}<\/code><\/pre><\/div>\n\n\n\n\u307e\u305a\u3001\u3053\u308c\u3089\u306e\u95a2\u6570\u3092\u305d\u306e\u307e\u307e\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u5b9f\u884c\u3055\u308c\u308b\u95a2\u6570\u3011<\/strong><\/p>\n\n\n\nwait5Seconds();\nwait2Seconds();\nconsole.log("calling");<\/code><\/pre><\/div>\n\n\n\n\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\ncalling\n2\u79d2\u7d4c\u904e\n5\u79d2\u7d4c\u904e<\/code><\/pre><\/div>\n\n\n\n\u3053\u308c\u3089\u306e\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u305f\u9806\u306b\u5b9f\u884c\u3055\u305b\u305f\u3044\u5834\u5408\u306b\u3001then\u30e1\u30bd\u30c3\u30c9\u3067\u8a18\u8ff0\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nwait5Seconds().then(() => {\n return wait2Seconds();\n}).then(() => {\n console.log("calling");\n});<\/code><\/pre><\/div>\n\n\n\n\u4e00\u65b9\u3001async\/await \u3092\u4f7f\u7528\u3057\u3066\u8a18\u8ff0\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nasync function asyncCall() {\n await wait5Seconds();\n await wait2Seconds();\n console.log("calling");\n}<\/code><\/pre><\/div>\n\n\n\nthen\u30e1\u30bd\u30c3\u30c9\u3068\u6bd4\u3079\u308b\u3068\u3001\u3069\u306e\u51e6\u7406\u3092\u3069\u306e\u9806\u756a\u3067\u5b9f\u884c\u3057\u3066\u3044\u308b\u306e\u304b\u304c\u898b\u3084\u3059\u304f\u306a\u3063\u305f\u306e\u304c\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u304b\uff1f
\u5b9f\u884c\u3059\u308b\u975e\u540c\u671f\u51e6\u7406\u306e\u6570\u3084\u3001\u51e6\u7406\u5185\u5bb9\u306e\u8907\u96d1\u3055\u304c\u5897\u3059\u307b\u3069\u3001\u3053\u306e\u9055\u3044\u306f\u30b3\u30fc\u30c9\u306e\u898b\u3084\u3059\u3055\u306b\u5927\u304d\u304f\u5f71\u97ff\u3057\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
“async\/await”\u3067\u4e26\u884c\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b<\/h2>\n\n\n\n
JavaScript\u306f\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u3067\u3057\u304b\u52d5\u304b\u306a\u3044\u6027\u8cea\u304c\u3042\u308b\u305f\u3081\u3001\u8907\u6570\u306e\u51e6\u7406\u3092\u4e26\u5217\u3067\u8d70\u3089\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
JavaScript\u306f\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u3067\u52d5\u4f5c\u3059\u308b\u4ed5\u69d8\u4e0a\u3001\u53b3\u5bc6\u306b\u306f\u8907\u6570\u306e\u51e6\u7406\u3092\u4e26\u5217\u3057\u3066\u5b9f\u884c\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002
\u3053\u3053\u307e\u3067\u8a18\u8ff0\u3057\u3066\u304d\u305f\u975e\u540c\u671f\u51e6\u7406\u3082\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u3067\u540c\u6642\u306b\u51e6\u7406\u3092\u884c\u3063\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u51e6\u7406\u306e\u5b9f\u884c\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u3067\u540c\u6642\u306b\u51e6\u7406\u3057\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u3066\u3044\u308b\u3060\u3051\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3067\u3059\u304c\u3001\u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u307e\u3068\u3081\u3066\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067\u3001\u7d50\u679c\u3068\u3057\u3066\u4e26\u5217\u51e6\u7406\u306b\u4f3c\u305f\u52d5\u304d (\u4e26\u884c\u51e6\u7406) \u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
JavaScript\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u884c\u3046\u5834\u5408\u306f\u3001Promise.all \u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
Promise.all \u306f \u5f85\u6a5f\u72b6\u614b\u306e Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5f15\u6570\u306b\u6e21\u3059\u3053\u3068\u3067\u3001 \u305d\u308c\u305e\u308c\u306e Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7d50\u679c\u304c\u8fd4\u3055\u308c\u308b\u3053\u3068\u3092\u4e26\u884c\u3067\u5f85\u6a5f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002
async\/await \u3067 Promise.all \u306e\u7d50\u679c\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u975e\u540c\u671f\u51e6\u7406\u3092\u4e26\u884c\u3057\u3066\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nfunction samlpeAsync(num) {\n return new Promise(resolve => {\n setTimeout(() => {\n resolve(num);\n }, num*1000 )\n });\n}\n\nasync function asyncCall() {\n \n const func1 = samlpeAsync(3);\n const func2 = samlpeAsync(5);\n const func3 = samlpeAsync(2);\n\n const [num1, num2, num3] = await Promise.all([func1, func2, func3]);\n\n console.log(num1 + num2 + num3);\n}\n\nconsole.log("start");\nasyncCall();\nconsole.log("end");<\/code><\/pre><\/div>\n\n\n\n\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\nstart\nend\n10<\/code><\/pre><\/div>\n\n\n\n\u5b9f\u884c\u3059\u308b\u3068\u3001\u975e\u540c\u671f\u51e6\u7406\u306e\u7d50\u679c\u304c\u304a\u3088\u305d\uff15\u79d2\u307b\u3069\u3067\u30b3\u30f3\u30bd\u30fc\u30eb\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
\u901a\u5e38\u306e async\/await \u3067\u5b9f\u884c\u3059\u308b\u3068\u3001\u5404\u51e6\u7406\u3054\u3068\u306b\u51e6\u7406\u306e\u5b8c\u4e86\u3092\u5f85\u6a5f\u3057\u3066\u304b\u3089\u6b21\u306e\u51e6\u7406\u3078\u3068\u79fb\u308b\u305f\u3081\u3001\u5168\u3066\u3092\u7d50\u679c\u3092\u5f97\u308b\u306e\u306b\u3088\u308a\u591a\u304f\u306e\u6642\u9593\u304c\u304b\u304b\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nasync function asyncCall() {\n\n \/\/ \u5168\u3066\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3059\u308b\u306e\u306b 10\u79d2\u307b\u3069\u304b\u304b\u3063\u3066\u3057\u307e\u3046\n const num1 = await samlpeAsync(3);\n const num2 = await samlpeAsync(5);\n const num3 = await samlpeAsync(2);\n\n console.log(num1 + num2 + num3);\n}\n\nasyncCall();<\/code><\/pre><\/div>\n\n\n\nPromise.all \u3092\u4f7f\u3063\u3066\u4e26\u884c\u51e6\u7406\u3059\u308b\u3053\u3068\u3067\u30013\u3064\u306e\u51e6\u7406\u306e\u4e2d\u3067\u6700\u3082\u6642\u9593\u306e\u304b\u304b\u308b func2\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u6bb5\u968e\u3067\u5168\u3066\u306e\u51e6\u7406\u7d50\u679c\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u305f\u3001Promise.all \u306f\u4f7f\u7528\u305b\u305a\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u6587\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\nasync function asyncCall() {\n\n const num1 = samlpeAsync(3);\n const num2 = samlpeAsync(5);\n const num3 = samlpeAsync(2);\n\n console.log(await num1 + await num2 + await num3);\n}\n\nasyncCall();<\/code><\/pre><\/div>\n\n\n\n\u307e\u3068\u3081<\/h2>\n\n\n\n
\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001JavaScript\u3067 async\/await \u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
\u975e\u540c\u671f\u51e6\u7406\u306f\u4ed5\u69d8\u4e0a\u3001\u30b3\u30fc\u30c9\u5185\u5bb9\u304c\u8907\u96d1\u306b\u306a\u308a\u304c\u3061\u306a\u305f\u3081\u3001\u6163\u308c\u306a\u3044\u3046\u3061\u306f\u7406\u89e3\u3059\u308b\u306e\u304c\u96e3\u3057\u3044\u3068\u611f\u3058\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u4e0a\u3067\u306f\u907f\u3051\u3066\u901a\u308c\u306a\u3044\u91cd\u8981\u306a\u6a5f\u80fd\u3067\u3059\u3002
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