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pullAtIndex javascript Code Snippet in 2023

arrayadvanced

Last Updated: 28 January 2023

Mutates the original array to filter out the values at the specified indexes. Returns the removed elements.

  • Use Array.prototype.filter() and Array.prototype.includes() to pull out the values that are not needed.
  • Set Array.prototype.length to mutate the passed in an array by resetting its length to 0.
  • Use Array.prototype.push() to re-populate it with only the pulled values.
  • Use 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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