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differenceWith javascript Code Snippet in 2022

arrayintermediate

Last Updated: 25 September 2022

Filters out all values from an array for which the comparator function does not return true.

  • Use Array.prototype.filter() and Array.prototype.findIndex() to find the appropriate values.
  • Omit the last argument, comp, to use a default strict equality comparator.
const differenceWith = (arr, val, comp = (a, b) => a === b) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);
differenceWith( [1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b) ); // [1, 1.2] differenceWith([1, 1.2, 1.3], [1, 1.3, 1.5]); // [1.2]

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