[프로그래머스] 올바른 괄호

correct_ parentheses_01.js

function solution(s){
    s = s.split('()').join('');
    
    const x = s.length;
    
    if(s[0] == ")" || s[x-1] == "("){
        return false;
    } else {
        let cnt = 0;
        s = s.split('');
       
        for(let i = 0; i < s.length; i++){
            if(s[i] == "("){
                cnt++;
            } else if(cnt > 0){
                cnt--;
            }
        }
        
        return (cnt != 0)? false : true; 
    }
}

correct_ parentheses_02.js

function solution(s){
    s = s.replace(/\(\)/g, '');
    const x = s.length;
    
    if(s[0] == ")" || s[x-1] == "("){
        return false;
    } else {
        let cnt = 0;
        s = s.split('');
       
        for(let i = 0; i < s.length; i++){
            if(s[i] == "("){
                cnt++;
            } else if(cnt > 0){
                cnt--;
            }
        }
        
        return (cnt != 0)? false : true; 
    }
}