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pullBy javascript Code Snippet in 2022

arrayadvanced

Last Updated: 26 November 2022

Mutates the original array to filter out the values specified, based on a given iterator function.

  • Check if the last argument provided is a function.
  • Use Array.prototype.map() to apply the iterator function fn to all array 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.
const pullBy = (arr, ...args) => { const length = args.length; let fn = length > 1 ? args[length - 1] : undefined; fn = typeof fn == 'function' ? (args.pop(), fn) : undefined; let argState = (Array.isArray(args[0]) ? args[0] : args).map(val => fn(val)); let pulled = arr.filter((v, i) => !argState.includes(fn(v))); arr.length = 0; pulled.forEach(v => arr.push(v)); };
var myArray = [{ x: 1 }, { x: 2 }, { x: 3 }, { x: 1 }]; pullBy(myArray, [{ x: 1 }, { x: 3 }], o => o.x); // myArray = [{ x: 2 }]

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