Filtering an Array based on another Boolean array

Question

Say I have two arrays:

const data = [1, 2, 3, 4]
const predicateArray = [true, false, false, true]

I want the return value to be:

[1, 4]

So far, I have come up with:

pipe(
  zipWith((fst, scnd) => scnd ? fst : null)),
  reject(isNil) 
)(data, predicateArray)

Is there a cleaner / inbuilt method of doing this?

Solution in Ramda is preferred.

Answer 1

这适用于原生 JS (ES2016)：

const results = data.filter((d, ind) => predicateArray[ind])

Answer 2

If you really want a Ramda solution for some reason, a variant of the answer from richsilv is simple enough:

R.addIndex(R.filter)((item, idx) => predicateArray[idx], data)

Ramda does not include an index parameter to its list function callbacks, for some good reasons, but addIndex inserts them.

Answer 3

As asked, with ramda.js :

const data = [1, 2, 3, 4];
const predicateArray = [true, false, false, true];

R.addIndex(R.filter)(function(el, index) {
  return predicateArray[index];
}, data); //=> [2, 4]

Updated example to fix issue referenced in the comment.