balanced-brackets

balanced-brackets.js

function balanced(theString) {
  const stack = [];
  for (let par of theString) {
    if (par == '(' || par == '{' || par == '[') {
      stack.push(par);
    }

    if (par == ')') {
      const parApertura = stack.pop();
      if (parApertura != '(') {
        return false;
      }
    }

    if (par == '}') {
      const parApertura = stack.pop();
      if (parApertura != '{') {
        return false;
      }
    }

    if (par == ']') {
      const parApertura = stack.pop();
      if (parApertura != '[') {
        return false;
      }
    }
  }

  if (stack.length > 0) {
    return false;
  }

  return true;
}

balanced-brackets.php

function balanced($the_string) {
  $stack = [];
  $len = strlen($the_string);

  for ($i=0 ; $i<$len ; $i++) {
    $par = $the_string[$i];

    if (in_array($par, ['(', '{', '['])) {
      array_push($stack, $par);
    }

    if ($par == ')') {
      $parOpen = array_pop($stack);
      if ($parOpen != '(') {
        return false;
      }
    }

    if ($par == '}') {
      $parOpen = array_pop($stack);
      if ($parOpen != '{') {
        return false;
      }
    }

    if ($par == ']') {
      $parOpen = array_pop($stack);
      if ($parOpen != '[') {
        return false;
      }
    }
  }

  if (count($stack) > 0) {
    return false;
  }

  return true;
}

balanced-brackets.py

def balanced(the_string):
  stack = []

  for par in the_string:
    if par == '(' or par == '{' or par == '[':
      stack.append(par)

    if par == ')':
      try:
        parApertura = stack.pop()
      except:
        return False

      if parApertura != '(':
        return False

    if par == '}':
      try:
        parApertura = stack.pop()
      except:
        return False

      if parApertura != '{':
        return False

    if par == ']':
      try:
        parApertura = stack.pop()
      except:
        return False

      if parApertura != '[':
        return False

  if len(stack) > 0:
    return False

  return True