balance_braces.js

function isBalanced(s) {
    let stack = [];
    let openPran = {'{': '}', '[': ']', '(':')'};
    let closedPran = {'}': true, ']': true, ')':true};

    for (let i = 0; i < s.length; i++) {
        const char = s[i];
        if(openPran[char]){
            stack.push(char);
        } else if (closedPran[char]){
            if(openPran[stack.pop()] !== char){
                return false
            }
        }
    }
    return stack.length === 0;
}

console.log(isBalanced('{[()]}'));
console.log(isBalanced('{[(])}'));
console.log(isBalanced('{{[[(())]]}}'));