lodash 确实省略了对其调用的数组的 mutate 吗？

Question

Looking at filter method of lodash, it was unclear to me by docs whether this method mutates the collection on which it is called.

But it appears that in react, when I try to make a new collection from previous properties and _.omit does mutate the parent.

Is _.reject a more proper solution which does not mutate its parent?

here is an example jsfiddle of profile.id dissapearing. https://jsfiddle.net/69z2wepo/96535/

Answer 1

I don't completely follow your question, but it appears you are concerned with whether one or more of filter , omit or reject mutate their input. None of them do. Run this snippet to see:

 const original = {a: 1}; console.log('--- filter() ---') console.log(_.filter(original, 'a')); console.log(original); console.log('--- omit() ---') console.log(_.omit(original, 'a')); console.log(original); console.log('--- reject() ---') console.log(_.reject(original, () => true)); console.log(original);

 <script src="https://unpkg.com/lodash@4.17.4/lodash.js"></script>

Shameless plug: filter() and omit() are available in my library Micro-dash , with a much smaller bundle size than their Lodash counterparts.