AI代码解释 var__values=(this&&this.__values)||function(o){varm=typeofSymbol==="function"&&o[Symbol.iterator],i=0;if(m)returnm.call(o);return{next:function(){if(o&&i>=o.length)o=void0;return{value:o&&o[i++],done:!o};}};};vartext="Booh! 👻";try{for(vartext_1=__value...
constx:[string,number]=['hello',0]// 上述元组可以看做为:interfaceTupleextendsArray<string|number>{0:string;1:number;length:2;} object。表示非原始类型。比如枚举、数组、元组都是 object 类型。 枚举类型 声明枚举类型时,如果没有显式的赋值,那么枚举值从 0 递增。如果显式赋值,那么后面的值从当前值...
declare type MethodDecorator = <T>(target:Object, propertyKey: string | symbol, descriptor: TypePropertyDescript<T>) => TypedPropertyDescriptor<T> | void; 方法装饰器顾名思义,用来装饰类的方法。它接收三个参数: target: Object - 被装饰的类 propertyKey: string | symbol - 方法名 descriptor: Type...
hasInstance](val: unknown): val is PointLike { return !!val && typeof val === "object" && "x" in val && "y" in val && typeof val.x === "number" && typeof val.y === "number"; } } function f(value: unknown) { if (value instanceof Point) { // Can access both of ...
isOnce: boolean; // is a v-once node?asyncFactory: Function | void; // async component factory functionasyncMeta: Object | void;isAsyncPlaceholder: boolean;ssrContext: Object | void;fnContext: Component | void; // real context vm for functional nodesfnOptions: ?ComponentOptions; // for ...
class MyObject implements Comparable<MyObject> { age: number; compareTo(b: MyObject): number { if (this.age === b.age) { return 0; } return this.age > b.age ? 1 : -1; } } 这是个很有用的功能,可以确保我们在比较相同类型的对象。利用这个功能,我们还可以使用编辑器的代码补全。
is - uses Object.is for comparison, isAny - matches anything, isNumber - matches any number, isString - matches any string, can search for substrings and patterns, isArray - matches any array, can search for subsets, isPlainObject - matches any plain object, containsObject - recursively match...
import{Object}from"ts-toolbelt"// Check the docs below for more// Merge two `object` togethertypemerge=Object.Merge<{name:string},{age?:number}>// {name: string, age?: number}// Make a field of an `object` optionaltypeoptional=Object.Optional<{id:number,name:string},"name">// {...
}functiontryGetPackageName(context:Context):string|undefined{constpackageJSON = context.packageJSON;// Check to see if we have an object.if(packageJSON &&typeofpackageJSON ==="object") {// Check to see if it has a string name property.if("name"inpackageJSON &&typeofpackageJSON.name==="...
If you do not wish to permitnull, you’ll need to track down where it came from and add either a check or an assertion: constel=document.getElementById('status');el.textContent='Ready';// ~~ Object is possibly 'null'if(el){el.textContent='Ready';// OK, null has been excluded}el...