Balanced Brackets Hacker Rank

BalancedBrackets.js

/*stack solutions*/
function isBalanced(s) {
const brackets={'{':'}','(':')','[':']'};
const arr=s.split('');
const stack=[];
/* if the length is odd*/
if(arr.length%2!==0) return 'NO';

for(let i=0; i<arr.length; i++)
{
    const op=brackets[arr[i]];
   if(op){
       stack.push(op)
   }else if(stack[stack.length-1]===arr[i]){
       stack.pop()
   }else{
       stack.push(op);
       break;
   }
   
}
return stack.length===0?'YES':'NO'

}