Checking opening and close scope

scopeCheck.js

function isOpeningTag(char) {
 return ['{', '[', '('].includes(char)
}

function isClosingTag(char) {
 return ['}', ']', ')'].includes(char)
}

function checkScope(str){
  var openingTagsCount = 0;
  for (var i = 0; i < str.length; i++){
    var char = str[i];
    if (isClosingTag(char) && !openingTagsCount) {
    	return false;
    }
    /* console.log(char, isOpeningTag(char)) */;
    if (isOpeningTag(char)) {
      openingTagsCount++;
    }
    if (isClosingTag(char)) {
      openingTagsCount--;
    }
  }
  return openingTagsCount === 0;
}

console.log(checkScope('{{}}')); // true expected
console.log(checkScope('{[{}]}')); // true expected
console.log(checkScope('{[{]}')); // true expected
console.log(checkScope('{{}'));// true expected
console.log(checkScope('}{')); // true expected