如何使用lodash过滤对象的键? [英] How to filter keys of an object with lodash?

问题描述

我有一个带有一些键的对象，我只想保留一些带有它们的值的键?

I have an object with some keys, and I want to only keep some of the keys with their value?

我尝试使用 filter:

const data = {
  aaa: 111,
  abb: 222,
  bbb: 333
};

const result = _.filter(data, (value, key) => key.startsWith("a"));

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

但它打印了一个数组:

[111, 222]

这不是我想要的.

如何用 lodash 做到这一点?如果 lodash 不起作用，或者其他什么?

How to do it with lodash? Or something else if lodash is not working?

推荐答案

Lodash 有一个 _.pickBy 函数，它完全符合您的要求.

Lodash has a _.pickBy function which does exactly what you're looking for.

var thing = {
  "a": 123,
  "b": 456,
  "abc": 6789
};

var result = _.pickBy(thing, function(value, key) {
  return _.startsWith(key, "a");
});

console.log(result.abc) // 6789
console.log(result.b)   // undefined

<script src="https://cdn.jsdelivr.net/lodash/4.16.4/lodash.min.js"></script>

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