reverse_string_day_151.js

function withoutRegExp(string = '') {
    let queue = [];
    let currentString = '';
    for (let i = 0; i < string.length; i++) {
        if (string.charAt(i) === '(') {
            queue.push(currentString);
            currentString = '';
        } else if (string.charAt(i) === ')') {
            currentString = queue.pop() + currentString.split('').reverse().join('');
        } else {
            currentString += string.charAt(i);
        }
    }
    console.log(currentString);
    return currentString;
}

Correctness: 60/60

Code Quality: 30/40

For regex solution you don't need foundMatch variable, the while loop will run as long as there is a ) present in the string.