如何按其值获取JavaScript“地图"中的键? [英] How can I get a key in a JavaScript 'Map' by its value?

问题描述

我有一个像这样的JavaScript地图"

I have a JavaScript 'Map' like this one

let people = new Map();
people.set('1', 'jhon');
people.set('2', 'jasmein');
people.set('3', 'abdo');

我想要一些方法，以按其值返回键.

I want some method to return a key by its value.

let jhonKey = people.getKey('jhon'); // jhonKey should be '1'

推荐答案

您可以将其转换为条目数组(使用 [... people.entries()] )并进行搜索在那个数组中.

You could convert it to an array of entries (using [...people.entries()]) and search for it within that array.

let people = new Map();
people.set('1', 'jhon');
people.set('2', 'jasmein');
people.set('3', 'abdo');
    
let jhonKeys = [...people.entries()]
        .filter(({ 1: v }) => v === 'jhon')
        .map(([k]) => k);

console.log(jhonKeys); // if empty, no key found otherwise all found keys.

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