takeRightWhile

Removes elements from the end of an array until the passed function returns true. Returns the removed elements.

Loop through the array, using a Array.prototype.reduceRight() and accumulating elements while the function returns falsy value.

typescript

const takeRightWhile = (arr: any[], func: Predicate) =>
  arr.reduceRight((acc, el) => (func(el) ? acc : [el].concat(acc)), []);

typescript

takeRightWhile([1, 2, 3, 4], (n) => n < 3); // [3, 4]