211021_leetcode_394.Decode string

Decode string

var decodeString = function(s) {
    
   let answer = "";
    let stack = [];
    
    for(let i = 0; i<s.length; i++){
        if(s[i] === ']' && stack.length !==0){
          let str ="";
          let num = "";
          let tmp = "";
          while(stack[stack.length-1] !== '['){
            tmp = stack.pop();
            str = tmp + str;
            console.log(str);
            }
            // [  빼주기 
            stack.pop();
            //2. 숫자 거르기
          while(stack.length && !isNaN(stack[stack.length-1]) ){
              num=stack.pop() + num;
            }
            //3 . 숫자와 문자 리핏 
            stack.push(str.repeat(parseInt(num)));
        }
        else{
            stack.push(s[i]);
            
        }
    }
    while(stack.length !==0){
      answer =stack.pop() +answer;
    }

  return answer;
};