.keys() 获取枚举所有name。 import{createEnumObject}from'ts-enum-object';constTestEnum=createEnumObject([{name:'A',value:1,label:'AA',},{name:'B',value:2,label:'BB',},{name:'C',value:3,label:'CC',},]asconst);// as const is requiredTestEnum.keys()// ['A', 'B', 'C']...
Object.create(b):((__.prototype=b.prototype),new__());};varAnimal=(function(){functionAnimal(name){this.name=name;}returnAnimal;})();varCat=(function(_super){__extends(Cat,_super);functionCat(){_super.
{ foo: 123, });// 写法4const obj = Object.create( prot, Object.getOwnPropertyDescriptors({ foo: 123, }));// Object.create(proto[, propertiesObject]) NDN// https://developer.mozilla.org/zh-CN
This works, but is a little bit awkward becauseDprobably won’t be used anywhere else in the signature forcreateStreetLight. While not badin this case, using a type parameter only once in a signature is often a code smell. That’s why TypeScript 5.4 introduces a newNoInfer<T>utility ty...
For example, we will create an enum Country with three properties (USA, UK, and Australia). Then we will define a function ‘getKeyByStringValue’ using the object.key returns an array of keys i.e. property name from the enum objects, and then we will filter the array to get the key...
其中这个new()代表调用这个类的构造函数, // 然后返回的就是T也就是这个类的类型 let create = <T>(c: new () => T): T => { return new c() } class Info2 { public age: number } // 传入一个泛型变量Info,传入的参数是一个类,这个函数就是用来你传入什么类,返回一个什么类的实例对象 ...
: string; } function createUser(user: Required<User>): void { // 创建用户 // ... ...
Over 200k developers use LogRocket to create better digital experiences Learn more → In summary, for constant enums, the enum member value can be the first member without an initializer or must have an initializer that is numeric, if it has other enum members preceding it. Note that constant...
Object.assign(target, source1, source2); target//{a:1, b:2, c:3} 同样的操作也可以进行对象克隆 functionclone(origin) { let originProto=Object.getPrototypeOf(origin);returnObject.assign(Object.create(originProto), origin); } 为对象添加属性 ...
TypeScript Version: 2.1.5 What I'd like to do is effectively extend from a record type and then add a few more custom properties. Since type aliases cannot by extended, I tried solving the problem with an indexed type signature in the in...