AI代码解释 functiongetPort(scheme:"http"):80;functiongetPort(scheme:"https"):443;functiongetPort(scheme:"http"|"https"):80|443{switch(scheme){case"http":return80;case"https":return443;}}consthttpPort=getPort("http");// Type 80consthttpsPort=getPort("https");// Type 443 现在,当返回...
In the above example, we used the switch cases at basic levels. We can also use the variables in the first statement to select the choices in the switch block. The default keyword will be the optional one of the switch statement, and it will be executed whenever the switch case is termi...
AI代码解释 enumMovement{Up="UP",Down="DOWN",Left="LEFT",Right="RIGHT"}functionhandlePlayerInput(key:string){switch(key){caseMovement.Up:// 移动玩家角色向上console.log("移动玩家角色向上");break;caseMovement.Down:// 移动玩家角色向下console.log("移动玩家角色向下");break;caseMovement.Left:// ...
function getArea(shape: Shape) { switch (shape.kind) { case 'circle': return Math.PI * Math.pow(shape.radius, 2) break; case 'square': return Math.pow(shape.sideLength, 2) break } } console.log(getArea({kind:"circle",radius:10})); console.log(getArea({kind:"square",sideLength:1...
type AppState = {};type Action = | { type: "SET_ONE"; payload: string } | { type: "SET_TWO"; payload: number };exportfunctionreducer(state: AppState, action: Action): AppState{switch (action.type) {case"SET_ONE":return { ...state,one: action.payload // `payload` is stri...
// Gooddeclare function fn(x: HTMLDivElement): stringdeclare function fn(x: HTMLElement): numberdeclare function fn(x: any): anylet myElem: HTMLDivElementlet x = fn(myElem) // x: string, :)优先使用使用可选参数，而不是重载：// Badinterface Example { diff(one: string): number ...
import { useReducer } from "react";const initialState = { count: 0 };type ACTIONTYPE =| { type: "increment"; payload: number }| { type: "decrement"; payload: string };function reducer(state: typeof initialState, action: ACTIONTYPE) {switch (action.type) {case "increment":return { ...
Flipping the Switch! Eventually all these decisions and meticulous planning had to go somewhere! What was years in the making turned intoa hefty pull request with over282,000 lineschanged. Plus, the pull request had to be refreshed periodically given that we couldn’t freeze the TypeScript code...
// You can override the _destruct method if you need, for example: _destruct: function () { for (var key in this) { if (this.hasOwnProperty(key)) { switch (typeof this[key]) { case 'string': this[key] = ''; break; case 'object': case 'function': this[key] = null; brea...
switch (error.code) { case 'EACCES': console.error(bind + ' requires elevated privileges'); process.exit(1); break; case 'EADDRINUSE': console.error(bind + ' is already in use'); process.exit(1); break; default: throw error;