如何通过其值获取JavaScript Map中的键? [英] How to get a key in a JavaScript Map by its value?

问题描述

我有一个这样的js地图

I have a js Map like this one

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

我想要的是一种按其值返回键的方法

what I want is some method to return a key by its value

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

推荐答案

您可以在一系列条目中查找它.

You could seach for it in an array of entries.

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 foudn otherwise all found keys.

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