JSFiddle - React, Tailwind, and code Playground

by Stas Orekhovskiy

JavaScript

function checkStr(str) {
  let chars = str.split(''),
    stack = [],
    open = ['{', '(', '['],
    close = ['}', ')', ']'],
    closeIndex,
    openIndex;

  for (let i = 0, len = chars.length; i < len; i++) {
  
    openIndex = open.indexOf(chars[i]);
    if (openIndex !== -1) {
      stack.push(openIndex);
      continue;
    }

    closeIndex = close.indexOf(chars[i]);
    if (closeIndex !== -1) {
      openIndex = stack.pop();
      if (closeIndex !== openIndex) {
        return false;
      }
    }
  }

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

  return true;
}

console.log(checkStr('text with([])'));
console.log(checkStr('text with ([]))'));
console.log(checkStr('text with ({[]}) '));
console.log(checkStr('text with ({[]} '));