Arrays & Array Methods (map, filter, reduce)

const numbers = [2, 3, 4, 5];
const result = numbers.reduceRight((acc, curr) => curr + '_' + acc);

It's faster than reduce()
It processes elements right to left
reduceRight() processes elements right to left: 1) Starts from last array element, 2) Moves towards first element, 3) Accumulator receives results in reverse order, 4) Useful for operations where order matters, 5) Results in '2_3_4_5' instead of '5_4_3_2', 6) Maintains array structure during processing, 7) Common in string concatenation scenarios, 8) Alternative to reversing array before reduce().
It only works with strings
It automatically reverses the array