Pull matching values from array
JavaScript, Array · Oct 22, 2020
Mutates the original array to filter out the values specified. Returns the removed elements.
- Use
Array.prototype.filter()andArray.prototype.includes()to pull out the values that are not needed. - Set
Array.prototype.lengthto mutate the passed in an array by resetting its length to0. - Use
Array.prototype.push()to re-populate it with only the pulled values. - Use
Array.prototype.push()to keep track of pulled values.
const pullAtValue = (arr, pullArr) => {
let removed = [],
pushToRemove = arr.forEach((v, i) =>
pullArr.includes(v) ? removed.push(v) : v
),
mutateTo = arr.filter((v, i) => !pullArr.includes(v));
arr.length = 0;
mutateTo.forEach(v => arr.push(v));
return removed;
};let myArray = ['a', 'b', 'c', 'd'];
let pulled = pullAtValue(myArray, ['b', 'd']);
// myArray = [ 'a', 'c' ] , pulled = [ 'b', 'd' ]
