function isBallancedParenthesis(str) {
let strArr = str.split(",");
let checkedArr = [];
let isBalanced = false;
for(let i of strArr) {
i === '(' ? checkedArr.push(i) : checkedArr.pop();
}
if(!checkedArr.length) isBalanced = true;
return isBalanced;
}
"(,(,(,(,(,),),),)" => false
"(,(,(,),),)" => true 의 결과 출력.