jQuery的/ JavaScript的：滤波阵列与另一个数组 [英] jQuery/JavaScript: Filter array with another array

问题描述

让我们说我有两个数组：

Let's say I have two arrays:

{First: [One, Two, Three], Second: [One, Two, Three], Third: [One, Two, Three]}

[First, Third]

现在我需要删除的第一阵列每一个关键，是不是在第二个数组。所以 - 与这两个例子 - 我应该留下：

Now I need to remove every key in first array that is not in second array. So - with those two in example - I should be left with:

{First: [One, Two, Three], Third: [One, Two, Three]}

我试图用该.grep $，但我无法弄清楚如何使用数组作为过滤器。需要帮助！ ：）

I tried to use $.grep for that, but I can't figure out how to use array as a filter. Help needed! :)

推荐答案

您可以在不创建一个新对象做其他的事情是删除属性。

Other thing you can do without creating a new object is to delete properties

var obj = {First: ["One", "Two", "Three"], Second: ["One", "Two", "Three"], Third: ["One", "Two", "Three"]};
var filter = ["Second", "Third"];


function filterProps(obj, filter) {
  for (prop in obj) {
      if (filter.indexOf(prop) == -1) {
          delete obj[prop];
      } 
  };
  return obj;
};

//Usage: 
obj = filterObject(obj, filter);

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