Matching Braces (JavaScript)

matching-braces.js

var braces = '{()[()]}';
// var braces = '{()()]}';
// var braces = '(';

(function matchingBraces() {
  if (braces.length === 1) return console.log(false);
  if (!braces) return console.log(true);

  var leftBraces = ['{', '(', '['];
  var rightBraces = ['}', ')', ']'];
  var leftMatches = [];

  for (var char in braces) {
    var current = braces[char];

    if (leftBraces.indexOf(current) > -1) leftMatches.push(current);

    if (rightBraces.indexOf(current) > -1) {
      if (!leftMatches) return console.log(false);

      var last = leftMatches[leftMatches.length - 1];
      if (leftBraces.indexOf(last) === rightBraces.indexOf(current)) {
        leftMatches.pop();
      } else {
        return console.log(false);
      }
    }
  }

  if (leftMatches.length === 0) return console.log(true);
})(braces);