{"id":10144,"date":"2020-04-19T15:15:23","date_gmt":"2020-04-19T06:15:23","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=10144"},"modified":"2023-05-27T23:27:40","modified_gmt":"2023-05-27T14:27:40","slug":"%e3%80%90typescript%e3%80%91%e3%80%8c%e3%82%af%e3%83%a9%e3%82%b9%e3%80%8d%e3%81%ab%e9%96%a2%e3%81%99%e3%82%8b%e7%9f%a5%e8%ad%98","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=10144","title":{"rendered":"\u3010TypeScript\u3011\u300c\u95a2\u6570\u300d\u3001\u300c\u30af\u30e9\u30b9\u300d\u306b\u95a2\u3059\u308b\u77e5\u8b58"},"content":{"rendered":"

\u95a2\u6570<\/h2>\n

\u57fa\u672c\u5f62<\/h3>\n

TypeScript\u306e\u95a2\u6570\u306f\u5f15\u6570\u3068\u623b\u308a\u5024\u306b\u30c7\u30fc\u30bf\u578b\u3092\u3064\u3051\u308b\u4e8b\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

function kansu(a: number, b: number): number {\r\n  return a + b;\r\n}\r\n\r\nconsole.log(kansu(1, 2));<\/pre>\n
\u7121\u540d\u95a2\u6570<\/h4>\n
\u95a2\u6570\u540d\u3092\u76f4\u63a5\u3064\u3051\u305a\u306b\u95a2\u6570\u3092\u5909\u6570\u306b\u4ee3\u5165\u3057\u3066\u4f7f\u7528\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
let kansu = function (a: number, b: number): number {\r\n  return a + b;\r\n};\r\n\r\nconsole.log(kansu(1, 2));<\/pre>\n
\u30a2\u30ed\u30fc\u95a2\u6570<\/h4>\n
function\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u308f\u305a\u306b\u30a2\u30ed\u30fc\u8a18\u53f7\u3092\u4f7f\u3063\u3066\u95a2\u6570\u3092\u8868\u73fe\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002ES2015\u304b\u3089\u5c0e\u5165\u3055\u308c\u305fJavaScript\u306e\u8a18\u6cd5<\/p>\n
let kansu = (a: number, b: number): number => {\r\n  return a + b;\r\n};\r\n\r\nconsole.log(kansu(1, 2));<\/pre>\n
\u95a2\u6570\u304c1\u884c\u306b\u53ce\u307e\u308b\u5834\u5408\u306f\u3055\u3089\u306a\u308b\u7701\u7565\u304c\u53ef\u80fd<\/h5>\n
\u95a2\u6570\u306e\u5185\u5bb9\u304c1\u884c\u306b\u306a\u308b\u5834\u5408\u306f\u300c\u6ce2\u304b\u3063\u3053\u300d\u3068\u300creturn\u6587\u300d\u3092\u7701\u7565\u3057\u3066\u3055\u3089\u306b\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u4e8b\u304c\u53ef\u80fd<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
let kansu = (a: number, b: number): number => a + b;\r\n\r\nconsole.log(kansu(1, 2));<\/pre>\n
\u30b7\u30b0\u30cd\u30c1\u30e3\u3068\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9<\/h4>\n
\u4e8b\u524d\u306b\u95a2\u6570\u306e\u5f15\u6570\u3084\u623b\u308a\u5024\u3068\u540c\u69d8\u306e\u30b7\u30b0\u30cd\u30c1\u30e3<\/strong><\/span>\u3068\u3044\u3046\u5b9a\u7fa9\u3060\u3051\u3057\u307e\u3059\u3002\u305d\u3046\u3059\u308c\u3070\u30b7\u30b0\u30cd\u30c1\u30e3\u3068\u540c\u69d8\u306e\u5f15\u6570\u3092\u6301\u3063\u305f\u5024\u3092\u4f7f\u308f\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
function a(b: number): number; \/\/\u30b7\u30b0\u30cd\u30c1\u30e3\r\n\r\nfunction a(b: any): any {\r\n  if (typeof b === 'number') {\r\n    return b + b;\r\n  }\r\n}\r\n\r\nconsole.log(a(5));\r\nconsole.log(a('c'));\u3000\/\/\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002<\/pre>\n
\u5f15\u6570\u306b\u3064\u3044\u3066<\/h3>\n
\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u5f15\u6570<\/h4>\n
\u5f15\u6570\u306e\u672b\u5c3e\u306b?<\/strong><\/span>\u3092\u3064\u3051\u308b\u4e8b\u3067\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u5f15\u6570\u3068\u3057\u3066\u5f15\u6570\u5ba3\u8a00\u3092\u4efb\u610f\u3068\u3059\u308b\u4e8b\u304c\u53ef\u80fd<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
let kansu = (a: number, b: number, c?: boolean): number => a + b;\r\n\r\nconsole.log(kansu(1, 2));<\/pre>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf<\/h4>\n
\u300c\u95a2\u6570\u306b\u5f15\u6570\u304c\u6e21\u3055\u308c\u306a\u3044\u5834\u5408\u300d\u307e\u305f\u306f\u300cundefined\u304c\u6e21\u3055\u308c\u305f\u5834\u5408\u300d\u306b\u95a2\u6570\u306b\u8a2d\u5b9a\u3057\u3066\u304a\u3044\u305f\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u4f7f\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u4e8b<\/strong><\/span>\u3067\u3059\u3002\u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
let kansu = (a: number, b: number = 5): number => a + b;\r\n\r\nconsole.log(kansu(1));<\/pre>\n
REST\u30d1\u30e9\u30e1\u30fc\u30bf<\/h4>\n
JavaScript\u3067\u3082\u3042\u308b\u6a5f\u80fd\u3067\u3059\u3002\u5f15\u6570\u306b\u300c...\u5f15\u6570\u540d\u300d<\/strong><\/span>\u3092\u3064\u3051\u308b\u4e8b\u3067\u4e0d\u7279\u5b9a\u591a\u6570\u306e\u5f15\u6570\u3092\u914d\u5217\u578b\u5f0f\u3067\u6e21\u3059<\/strong><\/span>\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
let kansu = (...a: number[]): number => a[0] + a[1];\r\n\r\nconsole.log(kansu(1, 2, 3));<\/pre>\n
\u30af\u30e9\u30b9<\/h2>\n
ES5\u4ee5\u524d\u306b\u300c\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u95a2\u6570\u300d\u3068\u3044\u3046\u6587\u6cd5\u304c\u3042\u308a\u307e\u3057\u305f\u304c\u307b\u3068\u3093\u3069class\u3068\u30a4\u30b3\u30fc\u30eb\u3067\u3059\u3002\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u95a2\u6570\u304c\u3088\u308a\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u3063\u305f\u3082\u306e\u3068\u6349\u3048\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u57fa\u672c\u5f62<\/h3>\n
class Person {\r\n  name: string;\r\n  age: number;\r\n\r\n  constructor(name: string, age: number) {\r\n    this.name = name;\r\n    this.age = age;\r\n  }\r\n\r\n  aisatu(): string {\r\n    return `name: ${this.name},age: ${this.age}`;\r\n  }\r\n}\r\nlet keji = new Person('\u5065\u4e8c', 30);\r\nconsole.log(keji.aisatu());<\/pre>\n
\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50<\/h3>\n
class \u30af\u30e9\u30b9\u540d {\r\n  public \u30e1\u30f3\u30d0\u540d: \u30c7\u30fc\u30bf\u578b;   \/\/\u516c\u958b\u30e1\u30f3\u30d0\r\n  private \u30e1\u30f3\u30d0\u540d: \u30c7\u30fc\u30bf\u578b; \/\/\u975e\u516c\u958b\u30e1\u30f3\u30d0\uff08\u30af\u30e9\u30b9\u5185\u90e8\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef\uff09\r\n}<\/pre>\n
public<\/h4>\n
\u516c\u958b\u30e1\u30f3\u30d0\u3001\u66f8\u3044\u3066\u3082\u66f8\u304b\u306a\u304f\u3066\u3082\u540c\u3058\u610f\u5473\u306b\u306a\u308b\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3067\u3059\u3002\u3080\u3057\u308d\u66f8\u304b\u306a\u3044\u306e\u304c\u666e\u901a\u3067\u3059\u3002<\/p>\n
private<\/h4>\n
\u975e\u516c\u958b\u30e1\u30f3\u30d0\u3001\u30af\u30e9\u30b9\u5185\u90e8\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef\u3001\u898f\u5236\u3057\u305f\u3044\u30e1\u30f3\u30d0\u306b\u5bfe\u3057\u3066\u660e\u793a\u7684\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
protected<\/h4>\n
\u6d3e\u751f\u30af\u30e9\u30b9\uff08\u5b50\u30af\u30e9\u30b9\uff09\u304b\u3089\u3082\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9\u306fTypeScript\u306e\u578b\u306b\u306a\u308b\u3002<\/h3>\n
\u4f5c\u3063\u305fclass\u306f\u76f4\u63a5TypeScript\u306e\u578b\u3068\u3057\u3066\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n
class Person {\r\n}\r\n\r\nconst peson:Person;<\/pre>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u521d\u671f\u5316\u306e\u52b9\u7387\u5316<\/h3>\n
\u4e0b\u8a18\u306e\u3088\u3046\u306b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306b\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u3064\u3051\u308b\u4e8b\u3067\u81ea\u52d5\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u521d\u671f\u5316\u51e6\u7406\u307e\u3067\u5b9f\u65bd\u3092\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n
class Person {\r\n  constructor(public name: string, private age: number) {}\r\n\r\n  aisatu(): string {\r\n    return `name: ${this.name},age: ${this.age}`;\r\n  }\r\n}\r\nlet keji = new Person('\u5065\u4e8c', 30);\r\nconsole.log(keji.aisatu());<\/pre>\n
\u30bb\u30c3\u30bf\u30fc\u3001\u30b2\u30c3\u30bf\u30fc<\/h3>\n
\u30e1\u30f3\u30d0\u5909\u6570\u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002\u6163\u7fd2\u7684\u306b\u30e1\u30f3\u30d0\u5909\u6570\u306e\u63a5\u982d\u8f9e\u306f\u300c_<\/span>\u300d\u3092\u3064\u3051\u3066\u30e1\u30bd\u30c3\u30c9\u540d\u306f\u30e1\u30f3\u30d0\u5909\u6570\u306f_<\/span>\u306a\u3057\u306e\u540d\u524d\u306b\u3057\u307e\u3059\u3002<\/p>\n
class Person {\r\n  constructor(public name: string, private _age: number) {}\r\n\r\n  get age() {\r\n    return this._age;\r\n  }\r\n\r\n  set age(age: number) {\r\n    this._age = age;\r\n  }\r\n}\r\nlet keji = new Person('\u5065\u4e8c', 30);\r\nkeji.age = 45;\r\nconsole.log(keji.age);<\/pre>\n
\u3061\u306a\u307f\u306b\u3001\u3053\u306e\u6a5f\u80fd\u306fTypeScript\u56fa\u6709\u6a5f\u80fd\u3067\u306f\u306a\u304fES6\u304b\u3089\u3042\u308bJavaScript\u306e\u6a5f\u80fd<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
readonly<\/h3>\n
class\u306e\u5916\u3067\u3082\u5185\u3067\u3082\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002\uff08\u521d\u671f\u5316\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u307f\uff09<\/p>\n
class Person {\r\n  public readonly name: string; \/\/\u516c\u958b\u30e1\u30f3\u30d0\r\n\r\n  constructor(name: string) {\r\n    this.name = name;\r\n  }\r\n}\r\nlet keji = new Person('\u5065\u4e8c', 30);\r\nkeji.name = '\u592a\u90ce';\r\n<\/pre>\n
\u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308c\u3070\u7701\u7565\u3057\u3066\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
class Person {\r\n  constructor(public readonly name: string, private _age: number) {}\r\n}\r\nlet keji = new Person('\u5065\u4e8c', 30);\r\nkeji.name = '\u592a\u90ce';<\/pre>\n
\u9759\u7684\u30e1\u30f3\u30d0<\/h3>\n
new<\/span>\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u306a\u304f\u3066\u3082\u30a2\u30af\u30bb\u30b9\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u30e1\u30f3\u30d0\u306e\u3053\u3068\u3067\u3059\u3002\u306a\u304a\u3001\u540c\u3058\u30af\u30e9\u30b9\u5185\u3067\u3042\u308c\u3070this<\/span>\u7d4c\u7531\u3067\u5225\u306e\u9759\u7684\u30e1\u30f3\u30d0\u3078\u30a2\u30af\u30bb\u30b9\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
class Person {\r\n  static firstname: string = '\u592a\u90ce';\r\n\r\n  static aisatu() {\r\n    return `\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306f${this.firstname}\u3067\u3059\u3002`;\r\n  }\r\n}\r\n\r\nconsole.log(Person.firstname);\r\nconsole.log(Person.aisatu());<\/pre>\n
\u540d\u524d\u7a7a\u9593<\/h3>\n
\u4e0b\u8a18\u306e\u3088\u3046\u306b\u540d\u524d\u7a7a\u9593\u3067\u5206\u3051\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u540c\u3058\u30af\u30e9\u30b9\u540d\u3092\u4f7f\u7528\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u5927\u62b5\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u306f\u540d\u524d\u7a7a\u9593\u3084\u305d\u308c\u3068\u4f3c\u305f\u6a5f\u80fd\u304c\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
namespace Tokyo {\r\n  export class Person {\r\n    constructor(public name: string) {}\r\n  }\r\n}\r\n\r\nnamespace Aiti {\r\n  export class Person {\r\n    constructor(public name: string) {}\r\n  }\r\n}\r\n\r\nconst hito = new Tokyo.Person('\u592a\u90ce');\r\nconsole.log(hito);<\/pre>\n
\u7d99\u627f<\/h3>\n
\u7d99\u627f\u306fextends\u30ad\u30fc\u30ef\u30fc\u30c9<\/strong><\/span>\u3092\u4f7f\u3063\u3066\u884c\u3044\u307e\u3059\u3002<\/p>\n
class Person {\r\n  constructor(public name: string) {}\r\n\r\n  aisatu(): string {\r\n    return `\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306f${this.name}\u3067\u3059`;\r\n  }\r\n}\r\n\r\nclass SuperMan extends Person {\r\n  constructor(public name: string) {\r\n    super(name);\r\n  }\r\n\r\n  aisatu(): string {\r\n    return `\u3053\u3093\u306b\u3061\u306f\u3001\u79c1\u306f${this.name}\u3067\u3059`;\r\n  }\r\n}\r\n\r\nconst hito = new Person('\u7530\u4e2d');\r\nconsole.log(hito.aisatu());\r\nconst hito2 = new SuperMan('\u9ad8\u6a4b');\r\nconsole.log(hito2.aisatu());<\/pre>\n
\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb<\/h3>\n
\u4efb\u610f\u306e\u30e1\u30f3\u30d0\u30fc\u3082\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u306f\u30e1\u30bd\u30c3\u30c9\u3084\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u6700\u5f8c\u306e\u30d1\u30bf\u30e1\u30fc\u30bf\u306b\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
class Person {\r\n  name?: string;\r\n  age: number;\r\n  constructor(age: number, name?: string) {\r\n    this.name = name;\r\n    this.age = age;\r\n  }\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"\u95a2\u6570 \u57fa\u672c\u5f62 TypeScript\u306e\u95a2\u6570\u306f\u5f15\u6570\u3068\u623b\u308a\u5024\u306b\u30c7\u30fc\u30bf\u578b\u3092\u3064\u3051\u308b\u4e8b\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002 function kansu(a: number, b: number): number { return a + b; }  […]","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\/10144"}],"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=10144"}],"version-history":[{"count":11,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10144\/revisions"}],"predecessor-version":[{"id":20605,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10144\/revisions\/20605"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10144"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10144"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}