function isBalanced(brackets: string): boolean {
  const mapper = { ")": "(", "}":"{", "]": "["}
  const stack = []

  for (const char of brackets) {
    if (mapper[char]) {
      if (!stack.length || mapper[char] !== stack[stack.length-1]) {
        return false
      }
      stack.pop()
    } else {
      stack.push(char)
    }
  }

  return stack.length === 0
}

// No modificar: necesario para evaluar el resultado.
export { isBalanced };