findLast

Finds the last element for which the provided function returns a truthy value.

• Use Array.prototype.filter() to remove elements for which fn returns falsy values.
• Use Array.prototype.pop() to get the last element in the filtered array.

const findLast = (arr, fn) => arr.filter(fn).pop();

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