如何通过值获取 JavaScript 对象中的键? [英] How to get a key in a JavaScript object by its value?

问题描述

我有一个非常简单的 JavaScript 对象，我将其用作关联数组.是否有一个简单的函数可以让我获取某个值的键，或者我是否必须迭代对象并手动找到它?

I have a quite simple JavaScript object, which I use as an associative array. Is there a simple function allowing me to get the key for a value, or do I have to iterate the object and find it out manually?

推荐答案

function getKeyByValue(object, value) {
  return Object.keys(object).find(key => object[key] === value);
}

ES6，没有原型突变或外部库.

ES6, no prototype mutations or external libraries.

示例，

function getKeyByValue(object, value) {
  return Object.keys(object).find(key => object[key] === value);
}


const map = {"first" : "1", "second" : "2"};
console.log(getKeyByValue(map,"2"));

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