{"id":45526,"date":"2023-09-13T04:52:22","date_gmt":"2023-04-24T13:22:23","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45526-2\/"},"modified":"2024-05-03T23:30:59","modified_gmt":"2024-05-03T15:30:59","slug":"45526-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45526-2\/","title":{"rendered":""},"content":{"rendered":"

\u306f\u3058\u3081\u306b<\/h1>\n

\u50d5\u3082\u304a\u524d\u3089\u306eXXXX\u306f<\u30cd\u30ac\u30c6\u30a3\u30d6\u306a\u5f62\u5bb9\u8a5e>\u30b7\u30ea\u30fc\u30ba \u3092\u30de\u30cd\u3057\u305f\u304b\u3063\u305f\u3093\u3067\u3059\u3002
\n\u3054\u3081\u3093\u306a\u3055\u3044\u3002<\/p>\n

Typescript\u66f8\u3044\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n

\u3042\u306a\u305f\u306fundefined\u6d3e\u3067\u3059\u304b\uff1f
\nnull+undefined\u6d3e\u3067\u3059\u304b\uff1f<\/p>\n

throw new Error\u6d3e\u3067\u3059\u304b\uff1f
\nreturn {error:null, result:true}\u6d3e\u3067\u3059\u304b\uff1f<\/p>\n

null\u3068undefined\u304c\u306a\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u306a\u3093\u3067null\u3092\u4f7f\u3063\u305f\u3089\u3044\u3051\u306a\u3044\u306e\uff1f<\/h2>\n

\u4f8b\u3048\u3070\u3001\u3053\u3046\u3044\u3046\u4f8b<\/p>\n

\/\/\u521d\u671f\u5024\u3068\u3057\u3066null\u3092\u4f7f\u3046<\/span>\r\nlet<\/span> str<\/span>:<\/span>string<\/span> =<\/span> null<\/span>;<\/span>\r\n\r\n\/\/\u4f55\u304b\u51e6\u7406\u3092\u3057\u3066str\u306b\u683c\u7d0d...\u3067\u304d\u3066\u306a\u304b\u3063\u305f<\/span>\r\n\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>str<\/span>.<\/span>toLowerCase<\/span>());<\/span> \/\/TypeError: Cannot read property 'toLowerCase' of null<\/span>\r\n<\/code><\/pre>\n
null\u304c\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3067\u304d\u3066\u3044\u306a\u3044\u306e\u3067toLowerCase()\u3067\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
tsconfig.json\u306b “strict”:true \u3084 “strictNullChecks”:true\u3092\u3064\u3051\u3066\u304a\u304f\u3068\u3001\u3053\u306e\u4f8b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u3089\u306a\u3044\u306e\u3067\u3001\u307e\u305a\u6709\u52b9\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
null\u3067\u306f\u306a\u304f\u3001undefined\u306b\u3059\u308b\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u8b66\u544a\u3057\u3066\u304f\u308c\u307e\u3059\u3057\u3001Optional chaining\u306a\u3069\u3082\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
let<\/span> str<\/span>:<\/span>string<\/span>|<\/span>undefined<\/span> =<\/span> undefined<\/span>;<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>str<\/span>.<\/span>toLowerCase<\/span>());<\/span> \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc str\u306f\u5fc5\u305aundefined\u3060\u304b\u3089<\/span>\r\n<\/code><\/pre>\n
let<\/span> str<\/span>:<\/span>string<\/span>|<\/span>undefined<\/span> =<\/span> undefined<\/span>;<\/span>\r\n\r\nif<\/span>(<\/span>Math<\/span>.<\/span>random<\/span>()<\/span> ><\/span> 0.5<\/span>){<\/span> \/\/\u7279\u306b\u610f\u5473\u306e\u306a\u3044\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u901a\u3059\u305f\u3081\u306e\u51e6\u7406<\/span>\r\n    str<\/span> =<\/span> '<\/span>yey<\/span>'<\/span>;<\/span>\r\n}<\/span>\r\n\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>str<\/span>?.<\/span>toLowerCase<\/span>());<\/span> \/\/str\u304cundefined\u3060\u3063\u305f\u3089\u3001toLowerCase()\u304c\u5b9f\u884c\u3055\u308c\u306a\u3044<\/span>\r\n<\/code><\/pre>\n
\u3067\u3082\u3001null or undefined\u306f\u7d71\u4e00\u3055\u308c\u3066\u3044\u306a\u3044<\/h2>\n
document<\/span>.<\/span>querySelector<\/span>(<\/span>\"<\/span>abc<\/span>\"<\/span>);<\/span> \/\/null<\/span>\r\n\r\n[<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>].<\/span>find<\/span>(<\/span>v<\/span>=><\/span>v<\/span>===<\/span>4<\/span>);<\/span> \/\/undefined<\/span>\r\n\r\n[<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>].<\/span>filter<\/span>(<\/span>v<\/span>=><\/span>v<\/span>===<\/span>4<\/span>);<\/span> \/\/[]<\/span>\r\n<\/code><\/pre>\n
\u7dba\u9e97\u4e8b\u3060\u3051\u3058\u3083\u751f\u304d\u3066\u3044\u3051\u306a\u3044\u3002<\/p>\n
undefined\u306b\u7d71\u4e00\u3057\u3066\u307f\u308b\u30fb\u30fb\u30fb\u3053\u3093\u306a\u5834\u5408\u306f\u3069\u3046\u3059\u308b\uff1f<\/h2>\n
\/\/\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u306e\u4e2d\u8eab\u3092\u6587\u5b57\u5217\u3067\u8fd4\u3059\u3002<\/span>\r\nfunction<\/span> downloadSomething<\/span>(<\/span>url<\/span>:<\/span>string<\/span>):<\/span> string<\/span> |<\/span> undefined<\/span>{<\/span>\r\n\r\n    \/\/\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u5931\u6557\u3057\u305f\u3089undefined\u3092\u8fd4\u3059\uff1f<\/span>\r\n    \/\/\u8907\u6570\u306e\u30a8\u30e9\u30fc\u306e\u5207\u308a\u5206\u3051\u3092\u3069\u3046\u3059\u308b\uff1f<\/span>\r\n    \/\/throw new Error\u3057\u3066\u5916\u5074\u306etry-catch\u3067\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3059\u308b\uff1f<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3092\u3069\u3046\u3059\u308b\u304b\u3001\u56f0\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002
\n\u3053\u306e\u3088\u3046\u306b\u66f8\u304f\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
function<\/span> validate<\/span>(<\/span>value<\/span>:<\/span> number<\/span>):<\/span> {<\/span>error<\/span>?:<\/span> string<\/span>}<\/span> {<\/span>\r\n  if<\/span> (<\/span>value<\/span> <<\/span> 0<\/span> ||<\/span> value<\/span> ><\/span> 100<\/span>)<\/span> return<\/span> {<\/span>error<\/span>:<\/span>'<\/span>Invalid value<\/span>'<\/span>};<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u2191Typescript deep dive\u3067\u306f\u3001\u3053\u3046\u3044\u3046\u66f8\u304d\u65b9\u3092\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3067\u3082\u3001\u623b\u308a\u5024\u304c\u5fc5\u8981\u3060\u3068 {error?: string, result?:string}\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u304d\u3066\u3001
\n\u30c1\u30fc\u30e0\u304c\u5927\u304d\u3044\u3068\u7d71\u4e00\u304c\u96e3\u3057\u304f\u306a\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n
Rust\u306eOption\u3068Result\u306f\u3044\u3044\u305e<\/h2>\n
Rust\u3067\u306f\u3001\u8a00\u8a9e\u3068\u3057\u3066\u3053\u3046\u3044\u3063\u305f\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
Option\u306fSome\u304bNone\u3068\u3044\u3046\u5024\u3092\u53d6\u308b<\/p>\n
null\u3084undefined\u3092\u4f7f\u308f\u306a\u3044\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u308b<\/p>\n
Result\u306fOk\u304bErr\u3068\u3044\u3046\u5024\u3092\u53d6\u308b<\/p>\n
\u5931\u6557\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u95a2\u6570\u306e\u623b\u308a\u5024\u3092\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3067\u304d\u308b<\/p>\n
Rust\u306eOption\u3068Result\u3092Typescript\u306b\u30dd\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u307e\u3057\u305f\u3002<\/h2>\n
https:\/\/github.com\/komasayuki\/ts-rust<\/p>\n
Typescript deep dive\u306e \u201d\u3072\u3069\u3044\u95a2\u6570\u306e\u4f8b\u201d\u3067\u8003\u3048\u3066\u307f\u307e\u3059\u3002<\/p>\n
function<\/span> toInt<\/span>(<\/span>str<\/span>:<\/span>string<\/span>)<\/span> {<\/span>\r\n  return<\/span> str<\/span> ?<\/span> parseInt<\/span>(<\/span>str<\/span>)<\/span> :<\/span> undefined<\/span>;<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u5f15\u6570\u306estr\u306fnull\u3092\u53d6\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002
\n\u3053\u308c\u3092ts-rust\u3092\u4f7f\u3063\u3066Rust\u3063\u307d\u304f\u66f8\u304f\u306b\u306f<\/p>\n
toInt(str:string) \u3092 toInt(str:Option)\u3068\u5ba3\u8a00\u3059\u308b\u3002<\/p>\n
\u307e\u305f\u3001\u623b\u308a\u5024\u306fundefined\u306e\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002
\n\u305d\u306e\u305f\u3081\u3001\u5143\u306e\u623b\u308a\u5024\u306f number|undefined\u3067\u3057\u305f\u3002<\/p>\n
\u3053\u306e\u623b\u308a\u5024\u306fResult<int, string>\u3068\u5ba3\u8a00\u3057\u307e\u3059\u3002
\n\u66f8\u304d\u76f4\u3059\u3068<\/p>\n
import<\/span> {<\/span>RustOption<\/span> as<\/span> Option<\/span>,<\/span> RustResult<\/span> as<\/span> Result<\/span>}<\/span> from<\/span> '<\/span>ts-rust<\/span>'<\/span>\r\n\r\n\/\/\u7c21\u5358\u306a\u4f8b<\/span>\r\nfunction<\/span> toIntVersion1<\/span>(<\/span>str<\/span>:<\/span>Option<\/span><<\/span>string<\/span>><\/span>)<\/span> :<\/span>Result<\/span><<\/span>number<\/span>,<\/span> string<\/span>><\/span> {<\/span>\r\n    if<\/span>(<\/span>str<\/span>.<\/span>isSome<\/span>()){<\/span>\r\n        return<\/span> Result<\/span>.<\/span>Ok<\/span>(<\/span>str<\/span>.<\/span>unwrap<\/span>());<\/span>\r\n    }<\/span>\r\n    return<\/span> Result<\/span>.<\/span>Err<\/span>(<\/span>'<\/span>parse failed<\/span>'<\/span>);<\/span>\r\n}<\/span>\r\n\r\n\/\/\u3088\u308aRust\u3063\u307d\u3044\u4f8b<\/span>\r\nfunction<\/span> toIntVersion2<\/span>(<\/span>str<\/span>:<\/span>Option<\/span><<\/span>string<\/span>><\/span>)<\/span> :<\/span>Result<\/span><<\/span>number<\/span>,<\/span> string<\/span>><\/span> {<\/span>\r\n    \/\/str.map(parseInt)     str\u304cSome\u306a\u3089parseInt\u306b\u6e21\u3059\u3001str\u304cNone\u306a\u3089\u305d\u306e\u307e\u307eNone\u3092\u8fd4\u3059<\/span>\r\n    \/\/okOr()                \u5de6\u8fba\u304cOption.Some\u306a\u3089Result.Ok(\u5de6\u8fba)\u3092\u8fd4\u3059\u3001\u5de6\u8fba\u304cOption.None\u306a\u3089Result.Err(\u5f15\u6570)\u3092\u8fd4\u3059<\/span>\r\n    return<\/span> str<\/span>.<\/span>map<\/span>(<\/span>parseInt<\/span>).<\/span>okOr<\/span>(<\/span>'<\/span>parse failed<\/span>'<\/span>);<\/span>\r\n}<\/span>\r\n\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>toIntVersion2<\/span>(<\/span>Option<\/span>.<\/span>Some<\/span>(<\/span>234<\/span>)).<\/span>toString<\/span>());<\/span> \/\/Ok(234)<\/span>\r\nconsole<\/span>.<\/span>log<\/span>(<\/span>toIntVersion2<\/span>(<\/span>Option<\/span>.<\/span>None<\/span>)<\/span>+<\/span>''<\/span>);<\/span> \/\/Err(\"parse failed\")<\/span>\r\n<\/code><\/pre>\n
toIntVersion1\u3084toIntVersion2\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u203b\u6700\u521d\u306e\u4f8b\u304b\u3089\u3001\u305d\u3082\u305d\u3082parseInt\u306eNaN\u3092\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u306f\u7121\u8996\u3057\u3066\u4e0b\u3055\u3044\uff01<\/p>\n
\u65b0\u3057\u304f\u4f5c\u3089\u306a\u304f\u3066\u3082Nullable\u306a\u578b\u306f\u63d0\u4f9b\u3057\u3066\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3042\u308b\u3088\u306d<\/h2>\n
\u3042\u3063\u305f\u3093\u3067\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u7406\u7531\u3067\u4f5c\u308a\u76f4\u3059\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n
    \n
  • \n
      Rust\u306eOption\/Result\u306e\u5168\u6a5f\u80fd\u3092\u7d20\u76f4\u306b\u30dd\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u3066\u3044\u308b\u3082\u306e\u304c\u306a\u304b\u3063\u305f<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          Rust\u306fsnake_case\u3060\u3051\u3069\u3001Typescript\u3067\u306fcamelCase\u306b\u3057\u305f\u304b\u3063\u305f<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \n
          • \n
              \u30c7\u30d0\u30c3\u30b0\u3059\u308b\u3068\u304d\u306b\u512a\u3057\u304f\u306a\u304b\u3063\u305f<\/ul>\n<\/li>\n<\/ul>\n
               <\/p>\n
                \u91cd\u8981\u306a\u30d9\u30fc\u30b9\u306b\u306a\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u306a\u306e\u3067\u3001\u5916\u90e8\u4f9d\u5b58\u306e\u306a\u3044\u5c0f\u3055\u3044\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3057\u305f\u304b\u3063\u305f<\/ul>\n
                Rust\u306f\u3044\u3044\u305e<\/h2>\n
                  Typescript\u3082\u3044\u3044\u305e<\/ul>\n","protected":false},"excerpt":{"rendered":"
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