ReverseString.js

const testString = 'hello';
const reverse = (s) => {
    let arr = Array.from(s),
        left = 0,
        right = arr.length - 1;

    while (left < right) {
        [arr[left], arr[right]] = [arr[right], arr[left]]
        left++
        right--
    }
    return arr.join('')
};
reverse(testString)