findBack

Finds the last element in an array that satisfies a predicate function.

Throws

  • Error: If the array is empty.
  • Error: If no element in the array satisfies the predicate function.

Type

type findBack = <E>(predicate: ((e: E) => boolean)) => (a: Array<E>) => E

Example

import {findBack} from 'fnxt/array';

function isEven(num: number): boolean {
  return num % 2 === 0;
}

const array = [1, 2, 3, 4, 5];
const lastEven = findBack(isEven)(array);
// lastEven is 4

See Also