freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.english.md

id, title, isRequired, challengeType, forumTopicId

id	title	isRequired	challengeType	forumTopicId
aaa48de84e1ecc7c742e1124	Palindrome Checker	true	5	16004

Description

Return true if the given string is a palindrome. Otherwise, return false. A palindrome is a word or sentence that's spelled the same way both forward and backward, ignoring punctuation, case, and spacing. Note
You'll need to remove all non-alphanumeric characters (punctuation, spaces and symbols) and turn everything into the same case (lower or upper case) in order to check for palindromes. We'll pass strings with varying formats, such as "racecar", "RaceCar", and "race CAR" among others. We'll also pass strings with special symbols, such as "2A3*3a2", "2A3 3a2", and "2_A3*3#A2".

Instructions

Tests

tests:
  - text: <code>palindrome("eye")</code> should return a boolean.
    testString: assert(typeof palindrome("eye") === "boolean");
  - text: <code>palindrome("eye")</code> should return true.
    testString: assert(palindrome("eye") === true);
  - text: <code>palindrome("_eye")</code> should return true.
    testString: assert(palindrome("_eye") === true);
  - text: <code>palindrome("race car")</code> should return true.
    testString: assert(palindrome("race car") === true);
  - text: <code>palindrome("not a palindrome")</code> should return false.
    testString: assert(palindrome("not a palindrome") === false);
  - text: <code>palindrome("A man, a plan, a canal. Panama")</code> should return true.
    testString: assert(palindrome("A man, a plan, a canal. Panama") === true);
  - text: <code>palindrome("never odd or even")</code> should return true.
    testString: assert(palindrome("never odd or even") === true);
  - text: <code>palindrome("nope")</code> should return false.
    testString: assert(palindrome("nope") === false);
  - text: <code>palindrome("almostomla")</code> should return false.
    testString: assert(palindrome("almostomla") === false);
  - text: <code>palindrome("My age is 0, 0 si ega ym.")</code> should return true.
    testString: assert(palindrome("My age is 0, 0 si ega ym.") === true);
  - text: <code>palindrome("1 eye for of 1 eye.")</code> should return false.
    testString: assert(palindrome("1 eye for of 1 eye.") === false);
  - text: '<code>palindrome("0_0 (: /-\ :) 0-0")</code> should return true.'
    testString: 'assert(palindrome("0_0 (: /-\ :) 0-0") === true);'
  - text: <code>palindrome("five|\_/|four")</code> should return false.
    testString: assert(palindrome("five|\_/|four") === false);

Challenge Seed

function palindrome(str) {
  return true;
}



palindrome("eye");

Solution

function palindrome(str) {
  var string = str.toLowerCase().split(/[^A-Za-z0-9]/gi).join('');
  var aux = string.split('');
  if (aux.join('') === aux.reverse().join('')){
    return true;
  }

  return false;
}