Array.prototype.filter()
and Array.prototype.includes()
to pull out the values that are not needed.Array.prototype.length
to mutate the passed in an array by resetting its length to 0
.Array.prototype.push()
to re-populate it with only the pulled values.Array.prototype.push()
to keep track of pulled values.const pullAtIndex = (arr, pullArr) => { let removed = []; let pulled = arr .map((v, i) => (pullArr.includes(i) ? removed.push(v) : v)) .filter((v, i) => !pullArr.includes(i)); arr.length = 0; pulled.forEach(v => arr.push(v)); return removed; };
let myArray = ['a', 'b', 'c', 'd']; let pulled = pullAtIndex(myArray, [1, 3]); // myArray = [ 'a', 'c' ] , pulled = [ 'b', 'd' ]
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