remove javascript Code Snippet in 2025

Mutates an array by removing elements for which the given function returns false.

• Use Array.prototype.filter() to find array elements that return truthy values.
• Use Array.prototype.reduce() to remove elements using Array.prototype.splice().
• The callback function is invoked with three arguments (value, index, array).

const remove = (arr, func) =>
  Array.isArray(arr)
    ? arr.filter(func).reduce((acc, val) => {
      arr.splice(arr.indexOf(val), 1);
      return acc.concat(val);
    }, [])
    : [];

remove([1, 2, 3, 4], n => n % 2 === 0); // [2, 4]