This function checks for braces

Braceschecker.js

function bracesChecker(str) {
 if(!str) {
   return true;
 }
 var openingBraces = [’{’, ’[’, ’(’];
 var closingBraces = [’}’, ’]’, ’)’];
 var stack = [];
 var openIndex;
 var closeIndex;
 //check for opening Braces in the val
 for (var i = 0, len = str.length; i < len; i++) {
   openIndex = openingBraces.indexOf(str[i]);
   closeIndex = closingBraces.indexOf(str[i]);
   if(openIndex !== -1) {
     stack.push(str[i]);
   }  
   if(closeIndex !== -1) {
     if(openingBraces[closeIndex] === stack[stack.length-1]) { 
       stack.pop();
     } else {
       return false;
     }
   }
 }
 if(stack.length === 0) {
   return true;
 } else {
   return false;
 }
}
var testStrings = [
 '', 
 'test', 
 '{{[][]()()}()}[]()', 
 '{test{[test]}}', 
 '{test{[test]}', 
 '{test{(yo)[test]}}', 
 'test{[test]}}', 
 'te()s[]t{[test]}', 
 'te()s[]t{[test'
];
testStrings.forEach(val => console.log(`${val} => ${bracesChecker(val)}`));