{"id":4554,"date":"2025-01-15T21:30:22","date_gmt":"2025-01-15T12:30:22","guid":{"rendered":"https:\/\/www.wsmeguro.jp\/wp\/?p=4554"},"modified":"2025-01-15T21:55:42","modified_gmt":"2025-01-15T12:55:42","slug":"dart%e3%81%ae%e5%8b%89%e5%bc%b711%e2%88%922%ef%bc%9a%e5%90%8c%e6%9c%9f%e3%83%bb%e9%9d%9e%e5%90%8c%e6%9c%9f%ef%bc%88-then%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsmeguro.jp\/wp\/?p=4554","title":{"rendered":"Dart\u306e\u52c9\u5f3711\u22122\uff1a\u540c\u671f\u30fb\u975e\u540c\u671f\uff08.then\uff09\uff08\u307e\u3068\u3081\u3066await\uff09"},"content":{"rendered":"<p>\u307e\u305a\u306f\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u3088\u3046\u304b\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-dart\" data-lang=\"Dart\">\r\n=async\/await\u3092\u4f7f\u308f\u306a\u3044=\r\nFuture<String> fetchUserData() {\r\n  return Future.delayed(Duration(seconds: 2), () => 'User Data');\r\n}\r\n\r\nvoid main() {\r\n  fetchUserData().then((data) {\r\n    print(data); \/\/ 2\u79d2\u5f8c\u306b \"User Data\" \u304c\u8868\u793a\u3055\u308c\u308b\r\n  });\r\n}\r\n\r\n=async\/await\u3092\u4f7f\u3046\u3068\u3053\u3046\u306a\u308b=\r\nFuture<String> fetchUserData() async {\r\n  return await Future.delayed(Duration(seconds: 2), () => 'User Data');\r\n}\r\n\r\nvoid main() async {\r\n  var data = await fetchUserData();\r\n  print(data); \/\/ 2\u79d2\u5f8c\u306b \"User Data\" \u304c\u8868\u793a\u3055\u308c\u308b\r\n}\r\n<\/pre>\n<\/div>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001.then\u306f\u3001\u51e6\u7406\u7d50\u679c\u3092\u5f85\u3063\u3066\u304b\u3089\u52d5\u304d\u59cb\u3081\u308b\uff08\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u30d9\u30fc\u30b9\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u65b9\u6cd5\uff09\u306e\u3067\u3001async\/await\u304c\u4e0d\u8981\u306b\u306a\u308b\u3068\u3044\u3046\u3053\u3068\u306e\u3088\u3046\u3060\u3002\u6b63\u78ba\u306b\u3044\u3046\u3068\u3001\u5373\u5ea7\u306bFuture\u304c\u8fd4\u3055\u308c\u3001\u51e6\u7406\u7d50\u679c\u306f\u7d42\u308f\u3063\u3066\u304b\u3089\u8fd4\u3059\u3068\u3044\u3046\u4ed5\u7d44\u307f\u3068\u306e\u3053\u3068\u3067\u3059\u3002<br \/>\n\u3053\u3093\u306a\u611f\u3058\u3067\u7d9a\u3051\u3066.then\u3092\u4f7f\u3046\u3053\u3068\u3082\u53ef\u80fd\u3060\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-dart\" data-lang=\"Dart\">\r\nFuture<String> fetchUserData() {\r\n  return Future.delayed(Duration(seconds: 2), () => 'User Data');\r\n}\r\n\r\nvoid main() {\r\n  fetchUserData().then((data) {\r\n    print('Fetched: $data'); \/\/ 2\u79d2\u5f8c\u306b \"Fetched: User Data\" \u304c\u8868\u793a\u3055\u308c\u308b\r\n    return data.toUpperCase(); \/\/ \u7d50\u679c\u3092\u5927\u6587\u5b57\u306b\u5909\u63db\u3057\u3066\u6b21\u306ethen\u306b\u6e21\u3059\r\n  }).then((modifiedData) {\r\n    print('Modified: $modifiedData'); \/\/ \"Modified: USER DATA\" \u304c\u8868\u793a\u3055\u308c\u308b\r\n  });\r\n}\r\n<\/pre>\n<\/div>\n<p>\u51e6\u7406\u7d50\u679c\u304c\u5927\u7389\u9001\u308a\u307f\u305f\u3044\u306b\u3001\u6b21\u3078\u6b21\u3078\u3068\u9001\u3089\u308c\u3066\u3044\u304f\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u3068\u3044\u3046\u7406\u89e3\u3067\u3044\u3044\u306e\u304b\u306a\u3041\u3002<br \/>\n\u5148\u751f\u306b\u3088\u308c\u3070\u3001\u6ce8\u610f\u4e8b\u9805\u304c\uff12\u3064<br \/>\n1.\u30b7\u30f3\u30d7\u30eb\u306a\u51e6\u7406\u3084\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u5c11\u306a\u3044\u5834\u5408\u306f.then() \u3067\u5341\u5206\u3002\u8907\u96d1\u306a\u975e\u540c\u671f\u51e6\u7406\u3084\u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u9806\u5e8f\u7acb\u3066\u3066\u66f8\u304f\u5834\u5408\u306fasync\/await \u306e\u65b9\u304c\u8aad\u307f\u3084\u3059\u304f\u4fdd\u5b88\u3057\u3084\u3059\u3044\u3002<br \/>\n2.then() \u3068 await \u3092\u6df7\u5728\u3055\u305b\u306a\u3044\u3002\uff08\u6df7\u5728\u3055\u305b\u308b\u3068\u8907\u96d1\u306b\u306a\u308a\u3084\u3059\u3044\u3068\u306e\u3053\u3068\uff09<\/p>\n<p>\u6b21\u306f\u3001\u307e\u3068\u3081\u3066await\u3067\u3059\u3002async\u306e\u95a2\u6570\u304c\u7d42\u308f\u308b\u6642\u306b\u306f\u3059\u3079\u3066\u306e\u51e6\u7406\u304c\u7d42\u308f\u3063\u3066\u3044\u3066\u307b\u3057\u3044\uff08\u3059\u3079\u3066\u306e\u51e6\u7406\u7d50\u679c\u3092\u8e0f\u307e\u3048\u3066\u6b21\u306e\u51e6\u7406\u304c\u52d5\u304f\uff09\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u305e\u308cawait\u3068\u3084\u308b\u3068\u6642\u9593\u304c\u304b\u304b\u308b\u306e\u3067\u3001\u4e26\u884c\u3057\u3066\u51e6\u7406\u3057\u3066\u307b\u3057\u3044\u3002\u306a\u3093\u3066\u3044\u3046\u3068\u304d\u306fFuture.wait\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-dart\" data-lang=\"Dart\">\r\nFuture<void> fetchUserData(int sec) async {\r\n  return await Future.delayed(\r\n      Duration(seconds: sec), () => print('User Data($sec)'));\r\n}\r\n\r\nFuture<void> doubleCallFetch() async {\r\n  await Future.wait([\r\n    fetchUserData(4),\r\n    fetchUserData(2),\r\n  ]);\r\n}\r\n\r\nvoid main() async {\r\n  await doubleCallFetch();\r\n  await fetchUserData(1);\r\n}\r\n=\u51e6\u7406\u7d50\u679c=\r\nUser Data(2)\r\nUser Data(4)\r\nUser Data(1)\r\n<\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u307e\u305a\u306f\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u3088\u3046\u304b\u3002 =async\/await\u3092\u4f7f\u308f\u306a\u3044= Future fetchUserData() { return Future.delayed(Duration(seconds: 2), () =&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[595,505],"tags":[601,619],"class_list":["post-4554","post","type-post","status-publish","format-standard","hentry","category-dart2","category-programming","tag-dart"],"_links":{"self":[{"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=\/wp\/v2\/posts\/4554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4554"}],"version-history":[{"count":4,"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=\/wp\/v2\/posts\/4554\/revisions"}],"predecessor-version":[{"id":4559,"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=\/wp\/v2\/posts\/4554\/revisions\/4559"}],"wp:attachment":[{"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsmeguro.jp\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}