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  1. Balanced Brackets
  2. Discussions

Balanced Brackets

  • balint
     + 1 comment

    That's the one I'm most proud of so far, so here we go (it's in JS):

    const pairs = {
  '{': '}',
  '(': ')',
  '[': ']',
};

function isOpenBracket(symbol) {
  return Object.keys(pairs).includes(symbol);
}

function isBalanced(s) {
  const openBrackets = [];
  const brackets = s.split('');
  for (let bracket of brackets) {
    if (isOpenBracket(bracket)) {
      openBrackets.push(bracket);
    } else {
      const lastOpenBracket = openBrackets[openBrackets.length - 1];
      if (!lastOpenBracket) {
        return 'NO';
      }
      if (pairs[lastOpenBracket] !== bracket) {
        return 'NO';
      }

      openBrackets.pop();
    }
  }

  return openBrackets.length === 0 ? 'YES' : 'NO';
}