* 泛型约束接口示例代码 */Interface iGeneric{length:number;}/*** * * 泛型约束类的示例代码 * */classGenericAdd<TextendsIgeneric>{arg:T;add(arg:T):boolean{this.arg=arg;arg.length++;returntrue;}getLength(){returnthis.arg.length;}} PS:爱学习的学友,爱前端,爱前端,爱运营,爱推广,爱交朋友。
constfullNameMaxLength=10;classEmployee{private_fullName:string="";getfullName():string{returnthis._fullName;}setfullName(newName:string){if(newName&&newName.length>fullNameMaxLength){thrownewError("fullName has a max length of "+fullNameMaxLength);}this._fullName=newName;}}letemployee=newEmp...
functioncompareString(str1:string,str2:string):boolean{// Convert both strings to lowercaseconstlowerCaseStr1=str1.toLowerCase();constlowerCaseStr2=str2.toLowerCase();// Remove whitespace from both stringsconsttrimmedStr1=lowerCaseStr1.trim();consttrimmedStr2=lowerCaseStr2.trim();// Check if ...
function addMethod (object, name, fn) {//先把原来的object[name] 方法,保存在old中varold =object[name];//重新定义 object[name] 方法object[name] =function () {//如果函数需要的参数 和 实际传入的参数 的个数相同,就直接调用fnif(fn.length ===arguments.length) {returnfn.apply(this, arguments...
letlength:any='5';letnumberLength:number= <number>length;// Using <type> syntaxletstringLength:number= lengthasnumber;// Using "as type" syntax 延伸阅读:TypeScript 官方手册——类型断言(https://www.typescriptlang.org/docs/handbook/basic-ty...
function f(x: unknown) { switch (true) { case typeof x === "string": // 'x' is a 'string' here console.log(x.toUpperCase()); // falls through... case Array.isArray(x): // 'x' is a 'string | any[]' here. console.log(x.length); // falls through... default: // ...
--strict: Whether use strict mode. In strict mode, script does not check string value can be converted to number or boolean example: $ npx typescript-type-checker --src "./src/lib" --out "./out/sanitizer.ts" --strict Then you can get sanitizer script at "./out/sanitizer.ts". ...
constfullNameMaxLength =10;classEmployee{private_fullName:string="";getfullName():string{returnthis._fullName;}setfullName(newName:string){if(newName && newName.length > fullNameMaxLength) {thrownewError("fullName has a max length of "+ fullNameMaxLengt...
check(name: string): boolean; } class NameChecker implements Checkable { check(s) { // Parameter 's' implicitly has an 'any' type. // Notice no error here return s.toLowercse() === "ok"; // any } } 在这个例子中,我们可能预计s的类型会受到check的name: string参数的影响。 它不是 ...
name: string; age: number; } function greet(person: Person): string { return `Hello, ${person.name}! You are ${person.age} years old.`; } const john: Person = { name: 'John', age: 30 }; const message: string = greet(john); console.log(message); // Output: "Hello, John!