Brackets.js

function isBalanced(s) {
    const temp = {
      "[": "]",
      "(": ")",
      "{": "}"
    };
    
    const stack = [];
    let closed;

    for (let i = 0; i < s.length; i++){
        const char = s.charAt(i);
        if (temp.hasOwnProperty(char)) {
            stack.push(char);
            closed = temp[char];                       
        } else {         		           	
            if(stack.length === 0 || char !== closed ){
            	return "NO";
            }
		
	    stack.pop();
            closed = temp[stack[stack.length-1]];           
        }        
    }
           
    return stack.length === 0 ? "YES": "NO";
}



function validateBrackets(str) {
  const temp = "(";	
  let count = 0;
  
  for(let i = 0; i < str.length; i++){
    const char = str.charAt(i);
    
    if(char === temp){
    	count++;
    } else {
      if(count === 0){
      	return false;
      }
      count--;
    }
  }

  return count === 0;
}

function validateBrackets(str) {
  const temp = [];
  for(let i = 0; i < str.length; i++ ){
    if(str.charAt(i) === "("){
      temp.push(str.charAt(i))
    }	else {
      if(temp.length == 0 ){
        return false;
      }
      temp.pop();    	
    }
  }
  
  return temp.length === 0;
}