使用键数组过滤Javascript对象 [英] Filtering Javascript object using array of keys

问题描述

基本上，我有一个如下所示的JavaScript数组:

Basically, I have JavaScript array that looks like this:

var keyFilters = ["key_1", "key_2", "key_3"];

我有一个看起来像这样的对象:

And I have an object that looks like this:

myObject["key_1"] = "Value 1";
myObject["key_2"] = "Value 2";
myObject["key_random"] = "Value 2";

我需要配对我的 myObject 对象以仅具有 keyFilters 数组中存在的键.有时，对象将没有过滤器中存在的键.在此示例中，针对 keyFilters 过滤 myObject 将导致以下输出对象:

I need to pair down my myObject object to only have the keys that exists in the keyFilters array. Sometimes, the object won't have a key that exists in the filter. In this example, filtering myObject against keyFilters would result in this outputted object:

myObject = {
    "key_1": "Value 1",
    "key_2": "Value 2",
}

我知道JS中没有用于对象的 map 函数，但是有一个用于数组的函数.最好使用该方法还是只编写一次函数来遍历数组，然后遍历对象，然后推送到仅具有匹配键的新对象，或者有某种简化方法?

I know there is no map function for objects in JS, but there is one for arrays. Would it be best to use that or just write a single-off function for iterating over the array and then over the object, and push to a new object that only has the matching keys, or is there some slicker way?

推荐答案

for (i in myObject) if (keyFilters.indexOf(i) < 0) delete myObject[i];

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