Parenthesis problem

/* Verify if a given string has a proper parenthesis setup */

function verify(str) {
  var array = str.split('');
  var stack = [];
  var left = ['{','[','('];
  var right = ['}',']',')'];
  var opposite = {
    ')':'(',
    '}':'{',
    ']':'[',
  }
  
  while (array.length > 0) {
    var x = array.shift();
    if (right.indexOf(x) > -1) {
      if (stack.pop() !== opposite[x]) return false;
    } else {
      stack.push(x);
    }
  }
  return (stack.length === 0);
}

console.log('empty',verify(''));
console.log('{[]{}}',verify('{[]{}}'));
console.log('(}{)',verify('(}{)'));
console.log('}{',verify('}{'));
console.log('{}',verify('{}'));
console.log('})]',verify('})]'));
console.log('{(}',verify('{(}'));
console.log('({})',verify('({})'));
console.log('([)]',verify('([)]'));
console.log('{{}}',verify('{{}}'));
console.log('()',verify('()'));
console.log('(()',verify('(()'));
console.log(')(',verify(')('));
console.log('(())()()',verify('(())()()'));