javascript - 如何用lodash过滤对象的键？(How to filter keys of an object with lodash?)

Question

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

(我有一个带有一些键的对象，我只想保留一些键的值？)

I tried with filter :

(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> 

But it prints an array:

(但是它会打印一个数组：)

[111, 222]

([111，222])

Which is not what I want.

(这不是我想要的。)

How to do it with lodash?

(用lodash怎么做？)

Or something else if lodash is not working?

(如果lodash无法正常工作，还是有其他原因？)

  ask by Freewind translate from so

Answer 1

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

(Lodash具有一个_.pickBy函数 ，它可以完全满足您的需求。)

 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>