{"id":10113,"date":"2020-04-19T09:12:02","date_gmt":"2020-04-19T00:12:02","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=10113"},"modified":"2023-05-27T23:28:19","modified_gmt":"2023-05-27T14:28:19","slug":"%e3%80%90typescript%e3%80%91%e3%80%8cnever%e5%9e%8b%e3%80%8d%e3%82%84%e3%80%8cvoid%e5%9e%8b%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=10113","title":{"rendered":"\u3010TypeScript\u3011\u300cnever\u578b\u300d\u3084\u300cvoid\u578b\u300d\u3001\u300cObject\u578b\u300d\u3001\u300c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30b7\u30b0\u30cd\u30c1\u30e3\u300d"},"content":{"rendered":"

void\u578b<\/h2>\n

\u95a2\u6570\u306e\u623b\u308a\u5024\u304c\u306a\u3044\u5834\u5408\u306b\u4f7f\u3044\u307e\u3059\u3002\uff08\u95a2\u6570\u306f\u660e\u793a\u7684\u306breturn\u6587\u3067\u4f55\u304b\u3057\u3089\u306e\u30c7\u30fc\u30bf\u3092\u8fd4\u3059\u3068\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u304c\u3001\u3053\u306e\u578b\u3092\u6307\u5b9a\u3059\u308c\u3070\u95a2\u6570\u306ereturn\u6587\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002\uff09<\/p>\n

\u3061\u306a\u307f\u306b\u3001\u30c7\u30d0\u30c3\u30b0\u3059\u308c\u3070\u308f\u304b\u308a\u307e\u3059\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u4e0a\u306fundefined<\/strong><\/span>\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

never\u578b<\/h2>\n

\u4f8b\u3048\u3070\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306a\u95a2\u6570\u3067\u3042\u308c\u3070\u4f8b\u5916\u3092throw<\/span>\u3092\u3057\u3066\u3044\u308b\u306e\u3067\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u308a\u5024\u304c\u8fd4\u3063\u3066\u304d\u307e\u305b\u3093\u3002<\/strong><\/span>\u305d\u3046\u3057\u305f\u5834\u5408\u306b\u4f7f\u3046\u306e\u304cnever<\/span>\u578b\u306b\u306a\u308a\u307e\u3059\u3002never<\/span>\u306f\u300c\u547c\u3073\u5143\u306b\u623b\u3063\u3066\u3053\u306a\u3044\u300d\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

function kansu() : never{\r\n  throw new Error(\u2018\u30a8\u30e9\u30fc\u3067\u3059\u2019);\r\n}<\/pre>\n
\u306a\u304a\u3001never<\/span>\u578b\u306e\u5909\u6570\u306b\u306f\u300cnever<\/span>\u578b\u3092\u623b\u308a\u5024\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u95a2\u6570\u306e\u307f\u300d<\/strong><\/span>\u4ee3\u5165\u304c\u8a31\u3055\u308c\u3066\u3044\u307e\u3059\u3002\uff08\u307b\u3068\u3093\u3069\u3053\u306e\u4f7f\u3044\u65b9\u3092\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u304b\u3068\u306f\u601d\u3044\u307e\u3059\u304c\u3002\uff09<\/p>\n
let hensu: never = kansu();<\/pre>\n
try\u301ccatch<\/h3>\n
\u306a\u304a\u3001\u547c\u3073\u51fa\u3057\u5143\u3067\u306fnever\u3067Error\u304cthrow\u3055\u308c\u308b\u95a2\u6570\u3067\u3042\u3063\u3066\u3082try\u301ccatch\u3092\u3059\u308c\u3070\u51e6\u7406\u3092\u7d99\u7d9a\u3055\u305b\u308b\u3053\u3068\u306f\u3067\u304d\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n
never\u578b\u3068<\/span>void\u578b\u306e\u9055\u3044<\/span><\/h2>\n
\u300cvoid<\/span>\u578b\u306f\u547c\u3073\u5143\u306b\u306f\u8fd4\u308a\u307e\u3059\u304c\u3001return<\/span>\u3055\u308c\u308b\u5024\u304c\u306a\u3044\u5834\u5408\u300d<\/strong><\/span>\u306b\u4f7f\u3044\u307e\u3059\u3002never<\/span>\u578b\u306f\u300c\u305d\u3082\u305d\u3082\u547c\u3073\u5143\u306b\u8fd4\u3063\u3066\u304f\u308b\u4e8b\u304c\u3042\u308a\u307e\u305b\u3093\u300d\u3002<\/p>\n
Object\u578b\u3068\u306f\uff1f<\/h2>\n
JavaScript<\/span>\u3067\u306f\u304a\u99b4\u67d3\u307f\u306e\u300c{}<\/span>\u300d\u306e\u30c7\u30fc\u30bf\u578b\u3092\u683c\u7d0d\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u30c7\u30fc\u30bf\u578b<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002\u6b63\u76f4\u6ce2\u304b\u3063\u3053\u306e\u4e2d\u8eab\u306f\u81ea\u7531\u306b\u66f8\u304d\u63db\u3048\u304c\u53ef\u80fd\u306a\u306e\u3067\u5236\u7d04\u304c\u7de9\u3044\u30c7\u30fc\u30bf\u578b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4e0b\u8a18\u306e\u4f8b\u306e\u3088\u3046\u306b\u7c21\u5358\u306b\u66f8\u304d\u63db\u3048\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
let obj: object = {name:\u2019\u592a\u90ce\u2019}\r\nobj = {age:34}<\/pre>\n
\u57fa\u672c\u7684\u306b\u306f\u5b9f\u52d9\u3067\u306f\u3053\u306e\u66f8\u304d\u65b9\u306f\u4f7f\u3044\u307e\u305b\u3093\u3002<\/strong><\/span>\u306a\u305c\u306a\u3089\u3069\u3093\u306a\u30ad\u30fc\u306b\u3067\u3082\uff08\u5b58\u5728\u3057\u306a\u3044\u30ad\u30fc\u306b\u3067\u3082\uff09\u30a2\u30af\u30bb\u30b9\u3067\u304d\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u578b\u3068\u3057\u3066\u306e\u5f79\u5272\u304c\u8584\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u5b9f\u52d9\u3067\u4f7f\u3046\u66f8\u304d\u65b9<\/h3>\n
\u57fa\u672c\u7684\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u66f8\u304d\u65b9\u3092\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n
let obj: {\r\n   name: string\r\n} = { name:\u2019\u592a\u90ce\u2019 }<\/pre>\n
\u3061\u306a\u307f\u306b\u3001\u3053\u308c\u306f\u308f\u3056\u308f\u3056\u578b\u5ba3\u8a00\u3057\u306a\u304f\u3066\u3082\u578b\u63a8\u8ad6\u3067\u81ea\u52d5\u3067\u578b\u3092\u6c7a\u5b9a\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n
\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30b7\u30b0\u30cd\u30c1\u30e3\u3068\u306f\uff1f<\/h2>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u3001\u4e2d\u8eab\u306e\u30c7\u30fc\u30bf\u540d\u3092\u62bd\u8c61\u7684\u306b\u66f8\u304d\u305f\u3044\u5834\u5408<\/strong><\/span>\u306b\u4f7f\u3044\u307e\u3059\u3002\u4e00\u3064\u4e00\u3064\u8a18\u8ff0\u3057\u3066\u3044\u3066\u306f\u5927\u5909\u306a\u306e\u3067\u3002<\/p>\n
\u69cb\u6587<\/h3>\n
[\u4efb\u610f\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d:\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u578b]: \u4ee3\u5165\u3059\u308b\u5024\u306e\u30c7\u30fc\u30bf\u578b<\/pre>\n
\u4f8b<\/h3>\n
\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u578b\u304cstring\u306e\u5834\u5408<\/h4>\n
let a: { [index: string]: string | number } = {};\r\na.name = '\u3042';\r\na.age = 12;<\/pre>\n
\u901a\u5e38\u306e\u30bf\u30a4\u30d7\u3067\u3042\u308c\u3070\u3001name\u3084age\u306a\u3069\u306e\u540d\u524d\u3092\u578b\u306e\u4e2d\u306b\u5b9a\u7fa9\u3057\u306a\u3051\u308c\u3070\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u304c\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30b7\u30b0\u30cd\u30c1\u30e3\u3092\u4f7f\u3048\u3070\u3044\u3061\u3044\u3061\u5b9a\u7fa9\u3057\u306a\u304f\u3066\u3082\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u578b\u304cnumber\u306e\u5834\u5408<\/h4>\n
\u6570\u5024\u3092\u30ad\u30fc\u3068\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u304c\u756a\u53f7\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
let a: { [index: number]: string | number } = {};\r\na[0] = '\u4e00\u3064\u76ee';\r\na[1] = '2\u3064\u76ee';<\/pre>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6570\u5024\u3092\u30ad\u30fc\u3068\u3059\u308b\u9023\u60f3\u914d\u5217\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
{0: \"\u4e00\u3064\u76ee\", 1: \"2\u3064\u76ee\"}<\/pre>\n","protected":false},"excerpt":{"rendered":"void\u578b \u95a2\u6570\u306e\u623b\u308a\u5024\u304c\u306a\u3044\u5834\u5408\u306b\u4f7f\u3044\u307e\u3059\u3002\uff08\u95a2\u6570\u306f\u660e\u793a\u7684\u306breturn\u6587\u3067\u4f55\u304b\u3057\u3089\u306e\u30c7\u30fc\u30bf\u3092\u8fd4\u3059\u3068\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u304c\u3001\u3053\u306e\u578b\u3092\u6307\u5b9a\u3059\u308c\u3070\u95a2\u6570\u306ereturn\u6587\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\uff09 \u3061\u306a\u307f\u306b\u3001\u30c7\u30d0\u30c3\u30b0\u3059\u308c […]","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\/10113"}],"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=10113"}],"version-history":[{"count":7,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10113\/revisions"}],"predecessor-version":[{"id":20607,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10113\/revisions\/20607"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10113"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10113"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}