let someArray = [1, "string",false];for(let entry of someArray) { console.log(entry);//1, "string", false} 二、for..in 方法 这个方法要注意和for..of的区别,for..in遍历的值是数组的索引 let list = [4, 5, 6];//for infor(let iinlist) { console.log(i);//"0", "1", "2...
interfaceAdmin{name:string;privileges:string[];}interfaceEmployee{name:string;startDate:Date;}type UnknownEmployee=Employee|Admin;functionprintEmployeeInformation(emp:UnknownEmployee){console.log("Name: "+emp.name);if("privileges"inemp){console.log("Privileges: "+emp.privileges);}if("startDate"inemp...
type User={firstName:string;lastName:string;};functiongetUserFullName(user:User,prefix?:string){return`${prefix??''}${user.firstName}${user.lastName}`;}constuser:User={firstName:"Jon",lastName:"Doe"};constuserFullName=getUserFullName(user);constmrUserFullName=getUserFullName(user,'Mr....
I've also written an article onhow to check if an array contains a value in TS. I wrotea bookin which I share everything I know about how to become a better, more efficient programmer. You can use the search field on myHome Pageto filter through all of my articles. ...
6）代码对于TypeScript：kotlin复制代码classPerson{privatename:string;constructor(privatename:string){this...
if ("startDate" in emp) { console.log("Start Date: " + emp.startDate); } } 4.2 typeof 关键字 function padLeft(value: string, padding: string | number) { if (typeof padding === "number") { return Array(padding + 1).join(" ") + value; ...
function getVersion(version:string) {if (!version) {version = "1.0.0";}return version;}console.log(getVersion("1.0.1")); 使用常见配置选项 {"compilerOptions": {"target": "ES6", // 目标语言的版本"removeComments": true, // 删除注释"outDir": "./dist/", // 编译输出路径"sourceMap": ...
functionsanitizeFoo(checker:any){if(typeofchecker.number!="number"||typeofchecker.boolean!="boolean"||(checker.maybeString!=undefined&&typeofchecker.maybeString!="string")||!sanitizeBar(checker.bar)){returnfalse;}returntrue;}functionsanitizeBar(checker:any){if(!sanitizenumberArray(checker.numbers)...
TypeScript 5.3 now can perform narrowing based on conditions in each case clause within a switch (true). Copy function f(x: unknown) { switch (true) { case typeof x === "string": // 'x' is a 'string' here console.log(x.toUpperCase()); // falls through... case Array.isArray...
Zero if they are equivalent Check outTypescript split string multiple separators Compare Strings for Sorting in TypeScript Now, let me show you some methods to compare strings for sorting in TypeScript. All method will have examples. Using Array.sort() with String Comparison ...