Here we will see how to enum gets key by string value in typescript by using for…in loop. Thefor..in loopin typescript is used to loop through the properties of an object. Also, this is used to iterate over the key of an object and do some action on each key Syntax: for (let...
函数内部通过传入的 object 以及对应的 key 返回object[key]。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functiongetValueFromKey(obj:object,key:string){// throw error// key的值为string代表它仅仅只被规定为字符串// TS无法确定obj中是否存在对应的keyreturnobj[key];} 显然,我们直接为参数声明...
function getValueFromKey(obj: object, key: string) { // throw error // key的值为string代表它仅仅只被规定为字符串 // TS无法确定obj中是否存在对应的key return obj[key]; } 显然,我们直接为参数声明类型这是会报错的。同学们可以结合刚刚学过的 keyof 关键字配合泛型来思考一下如何消除 TS 的错误提示。
写一个get函数,输入对象和key,返回对应的value 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // 这种时候,可能就开始写any了。因为不知道传入的是什么functiongetValue(o:any,k:string):any{returno[k]}getValue({a:1,b:'2'},'a');// 稍微好一点的可能是“觉得这是对象所以是object”// functi...
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这是一个类型安全的解决方案,而不是简单地调用let value = obj[key];之类的东西。 从这里getProperty函数很容易调用,如下面的例子所示,从typescript_info对象中获取属性: // the property we will get will be of type Difficultyenum Difficulty { Easy, Intermediate, Hard}// defining the object we will ...
Array<VNode>;text: string | void;elm: Node | void;ns: string | void;context: Component | void; // rendered in this component's scopekey: string | number | void;componentOptions: VNodeComponentOptions | void;componentInstance: Component | void; // component instanceparent: VNode | void; ...
replace(/<[^>]+>/g, "") } interface params { [propertyName: string]: string | number } /* 解析url参数 */ export const toParams = (params:params):string => { if(params){ let query = []; for(let key in params){ query.push(`${key}=${params[key]}`) } return `${query....
[key: number]: number;/*** Shortest name: {@link InterfaceL1.(:FUNCTOR)}* Full name: {@link (InterfaceL1:interface).(:FUNCTOR)}** {@label FUNCTOR}*/(source: string, subString: string): boolean;/*** Shortest name: {@link InterfaceL1.(:CONSTRUCTOR)}* Full name: {@link (Interface...
set(key, someObject); myWeakMap.has(key); This update was provided by Leo Elmecker-Plakolm on the behalf of Bloomberg. We’d like to extend our thanks to them! Type-Only Import Paths with TypeScript Implementation File Extensions TypeScript now allows both declaration and implementation ...