{"id":16240,"date":"2022-01-08T16:45:16","date_gmt":"2022-01-08T07:45:16","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=16240"},"modified":"2023-05-27T23:24:23","modified_gmt":"2023-05-27T14:24:23","slug":"%e3%80%90typescript%e3%80%91%e3%80%8c%e3%82%aa%e3%83%bc%e3%83%90%e3%83%bc%e3%83%ad%e3%83%bc%e3%83%89%e3%80%8d%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=16240","title":{"rendered":"\u3010TypeScript\u3011\u300c\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u300d\u306b\u3064\u3044\u3066"},"content":{"rendered":"

\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3068\u306f\uff1f<\/h2>\n

\u300c\u95a2\u6570\u306b\u5bfe\u3057\u3066\u8907\u6570\u306e\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u300d\u3067\u3059\u3002\u4ed6\u8a00\u8a9e\u306e\u3088\u3046\u306b\u3001\u5f15\u6570\u306e\u7570\u306a\u308b\u540c\u540d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8907\u6570\u5b9f\u88c5\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3042\u304f\u307e\u3067\u4e00\u3064\u306e\u307f\u95a2\u6570\u3092\u5b9f\u88c5\u3059\u308b\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u30e1\u30ea\u30c3\u30c8<\/h2>\n

\u300c\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u578b\u306b\u3088\u3063\u3066\u8fd4\u308a\u5024\u306e\u578b\u304c\u5909\u308f\u308b\u95a2\u6570\u300d<\/strong><\/span>\u3092\u8868\u73fe\u3067\u304d\u308b\u3002<\/h3>\n

\u57fa\u672c\u7684\u306b\u4ed6\u8a00\u8a9e(Java\u306a\u3069)\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u540c\u3058\u3068\u601d\u3063\u3066\u826f\u3044\u3067\u3059\u3002<\/p>\n

\u672b\u5c3e\u4ee5\u5916\u306e\u5f15\u6570\u306e\u578b\u3092\u4efb\u610f\u306b\u3059\u308b\u5b9f\u88c5\u304c\u53ef\u80fd<\/h3>\n

\u9006\u306b\u8a00\u3048\u3070\u3001\u672b\u5c3e\u306e\u5f15\u6570\u306e\u307f\u304cOptional\u306b\u306a\u308b\u5834\u5408\u306f\u3001\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3067\u306f\u306a\u304f\u3001\u578b\u306b\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u6307\u5b9a\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n

function\u3092\u4f7f\u3063\u3066\u66f8\u304f\u65b9\u6cd5<\/h2>\n

\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n

function \u95a2\u6570\u540d(\u5f15\u6570:\u5f15\u6570\u306e\u578b):\u623b\u308a\u5024 \/\/ \u30b7\u30b0\u30cd\u30c1\u30e31\r\nfunction \u95a2\u6570\u540d(\u5f15\u65701:\u5f15\u6570\u306e\u578b,\u5f15\u65702:\u5f15\u6570\u306e\u578b):\u623b\u308a\u5024 \/\/ \u30b7\u30b0\u30cd\u30c1\u30e32\r\nfunction \u95a2\u6570\u540d() {\r\n  \/\/ \u5177\u4f53\u7684\u306a\u5b9f\u88c5\r\n}\r\n<\/pre>\n
\u5177\u4f53\u7684\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
function test(arg1: number): number;\r\nfunction test(arg1: string, arg2: number): number;\r\nfunction test(arg1: string | number, arg2?: number) {\r\n  if (typeof arg1 === \"string\" && arg2) return Number(arg1) + arg2;\r\n  if (arg2) return Number(arg1) + arg2;\r\n  return 0;\r\n}\r\n\r\nconsole.log(\"test(1)\", test(1)); \/\/ 0\r\nconsole.log(\"test(1,2)\", test(\"1\", 2)); \/\/ 3<\/pre>\n
function\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u306a\u3044<\/strong><\/span>\u306e\u3067\u6ce8\u610f\u3067\u3059\u3002<\/p>\n
type\u3001interface\u3092\u4f7f\u3063\u3066\u66f8\u304f\u65b9\u6cd5<\/h2>\n
\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092type\u3092\u4f7f\u3063\u3066\u66f8\u304d\u76f4\u3059\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u306a\u304a\u3001type\u3067\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u500b\u3005\u306e\u95a2\u6570\u3092\u300c\u547c\u3073\u51fa\u3057\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u8981\u306f\u3001\u95a2\u6570\u305d\u306e\u3082\u306e\u306e\u578b\u306e\u3053\u3068\u3067\u3059\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306a\u3069\u3092\u5f15\u6570\u306b\u6e21\u3059\u5834\u5408\u306a\u3069\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\uff09\u300d<\/strong><\/span>\u3068\u547c\u3076\u3088\u3046\u3067\u3059\u3002<\/p>\n
type\u7248<\/h3>\n
type test = {\r\n  (arg1: number): number; \/\/ \u547c\u3073\u51fa\u3057\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c81\r\n  (arg1: string, arg2: number): number; \/\/ \u547c\u3073\u51fa\u3057\u53ef\u80fd\u30aa\u30d6\u30b8\u30a7\u30af\u30c82\r\n};\r\n\r\nconst testfunc: test = (arg1: string | number, arg2?: number) => {\r\n  if (typeof arg1 === \"string\" && arg2) return Number(arg1) + arg2;\r\n  if (arg2) return Number(arg1) + arg2;\r\n  return 0;\r\n};\r\n\r\nconsole.log(\"test(1)\", testfunc(1)); \/\/ 0\r\nconsole.log(\"test(1,2)\", testfunc(\"1\", 2)); \/\/ 3<\/pre>\n
interface\u7248<\/h3>\n
interface test {\r\n  (arg1: number): number;\r\n  (arg1: string, arg2: number): number;\r\n}\r\n\r\nconst testfunc: test = (arg1: string | number, arg2?: number) => {\r\n  if (typeof arg1 === \"string\" && arg2) return Number(arg1) + arg2;\r\n  if (arg2) return Number(arg1) + arg2;\r\n  return 0;\r\n};\r\n\r\nconsole.log(\"test(1)\", testfunc(1)); \/\/ 0\r\nconsole.log(\"test(1,2)\", testfunc(\"1\", 2)); \/\/ 3<\/pre>\n
\u3053\u306e\u65b9\u6cd5\u3067\u3042\u308c\u3070\u3001\u30a2\u30ed\u30fc\u95a2\u6570<\/strong><\/span>\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3068\u306f\uff1f \u300c\u95a2\u6570\u306b\u5bfe\u3057\u3066\u8907\u6570\u306e\u578b\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u300d\u3067\u3059\u3002\u4ed6\u8a00\u8a9e\u306e\u3088\u3046\u306b\u3001\u5f15\u6570\u306e\u7570\u306a\u308b\u540c\u540d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u8907\u6570\u5b9f\u88c5\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3042\u304f\u307e\u3067\u4e00\u3064\u306e\u307f\u95a2\u6570\u3092\u5b9f\u88c5\u3059\u308b\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002 \u30e1\u30ea\u30c3\u30c8 \u300c\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u578b\u306b\u3088\u3063 […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[101],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/16240"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16240"}],"version-history":[{"count":8,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/16240\/revisions"}],"predecessor-version":[{"id":20598,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/16240\/revisions\/20598"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16240"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}