30-seconds-of-code/snippets/remove.md

title, tags

title	tags
remove	array,intermediate

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 and Array.prototype.reduce() to remove elements using Array.prototype.splice(). The func 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]