Untitled

<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Balanced Parentheses">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
function isBalanced(str){

  if(str.length <= 1) return false;

  let matchingOpeningBracket, ch;
  let stack = [];

  let openBrackets = ['{', '[', '('];
  let closeBrackets = ['}', ']', ')'];

  for(let i = 0; i< str.length; i++) {
    ch = str[i];

    if(closeBrackets.indexOf(ch) > -1){
      matchingOpeningBracket = openBrackets[closeBrackets.indexOf(ch)];
      if(stack.length == 0 || (stack.pop() != matchingOpeningBracket)) {
         return false;
      }
    } else if(openBrackets.indexOf(ch) > -1){
      stack.push(ch);
    }

  }
  return true;
}

console.log(isBalanced("([wewewe)]")); // false
console.log(isBalanced("(erwerwerwer)")); // true
console.log(isBalanced("{}[]()")); // true
console.log(isBalanced("{[}]")); // false
console.log(isBalanced("{[}]")); // false
console.log(isBalanced("[{()()}({[]})]({}[({})])((((((()[])){}))[]{{{({({({{{{{{}}}}}})})})}}}))[][][]")); // true
console.log(isBalanced("{}[]()")); // true
</script>


<script id="jsbin-source-javascript" type="text/javascript">function isBalanced(str){

  if(str.length <= 1) return false;

  let matchingOpeningBracket, ch;
  let stack = [];

  let openBrackets = ['{', '[', '('];
  let closeBrackets = ['}', ']', ')'];

  for(let i = 0; i< str.length; i++) {
    ch = str[i];

    if(closeBrackets.indexOf(ch) > -1){
      matchingOpeningBracket = openBrackets[closeBrackets.indexOf(ch)];
      if(stack.length == 0 || (stack.pop() != matchingOpeningBracket)) {
         return false;
      }
    } else if(openBrackets.indexOf(ch) > -1){
      stack.push(ch);
    }

  }
  return true;
}

console.log(isBalanced("([wewewe)]")); // false
console.log(isBalanced("(erwerwerwer)")); // true
console.log(isBalanced("{}[]()")); // true
console.log(isBalanced("{[}]")); // false
console.log(isBalanced("{[}]")); // false
console.log(isBalanced("[{()()}({[]})]({}[({})])((((((()[])){}))[]{{{({({({{{{{{}}}}}})})})}}}))[][][]")); // true
console.log(isBalanced("{}[]()")); // true</script></body>
</html>