bracket-check.js

const check = (input) => {
  const arr = [];
  const right = [')', '}', ']'];
  const left =  ['(', '{', '['];

  for (let i = 0; i < input.length; i++) {
    const s = input[i];

    if (left.indexOf(s) !== -1) {
      arr.push(s);
    }

    const r = right.indexOf(s);
    if (r !== -1) {
      const opposite = arr.pop();
      if (opposite !== left[r]) {
        return false;
      }
    }

  }
  return arr.length === 0;
} 

console.log('check1', check('({[]})()'));
console.log('check2', check('(){'));