These are chat archives for camperbot/bonfire-check-for-palindromes

26th
Sep 2015
Monesul Haque
@mones-cse
Sep 26 2015 07:36 UTC
hinthint
CamperBot
@camperbot
Sep 26 2015 07:36 UTC

hint [1/8]

## :construction: After this are possible spoiler hints.

Make sure you've tried to hard to solve it yourself before proceeding. :construction:

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Monesul Haque
@mones-cse
Sep 26 2015 07:36 UTC
hint
CamperBot
@camperbot
Sep 26 2015 07:36 UTC

hint [2/8]

# Explanation:

You have to check if the string you get as an input is a palindrome and return true if it is, and false otherwise.

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yuluska
@yuluska
Sep 26 2015 13:26 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:26 UTC

hint [1/8]

## :construction: After this are possible spoiler hints.

Make sure you've tried to hard to solve it yourself before proceeding. :construction:

type hint for next hint :pencil: [Contribute at the FCC Wiki]

yuluska
@yuluska
Sep 26 2015 13:26 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:26 UTC

hint [2/8]

# Explanation:

You have to check if the string you get as an input is a palindrome and return true if it is, and false otherwise.

type hint for next hint :pencil: [Contribute at the FCC Wiki]

yuluska
@yuluska
Sep 26 2015 13:26 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:26 UTC

hint [3/8]

Hint: 1

You may use regular expressions (RegExp) to remove unwanted characters from the string.

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yuluska
@yuluska
Sep 26 2015 13:29 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:29 UTC

hint [4/8]

Hint: 2

You may use Array.prototype.split and Array.prototype.join methods or for loop.

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yuluska
@yuluska
Sep 26 2015 13:29 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:29 UTC

hint [5/8]

Hint: 3

You may lowercase the string using String.prototype.toLowerCase.

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yuluska
@yuluska
Sep 26 2015 13:36 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:36 UTC

hint [6/8]

Spoiler Alert!

687474703a2f2f7777772e796f75726472756d2e636f6d2f796f75726472756d2f696d616765732f323030372f31302f31302f7265645f7761726e696e675f7369676e5f322e676966.gif

Solution ahead!

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yuluska
@yuluska
Sep 26 2015 13:36 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:36 UTC

hint [7/8]

First

function palindrome(str) {
  var normalizedStr = str.replace(/[\W_]/g, '').toLowerCase();
  var reverseStr = normalizedStr.split('').reverse().join('');
  return normalizedStr === reverseStr;
}

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yuluska
@yuluska
Sep 26 2015 13:38 UTC
hint
CamperBot
@camperbot
Sep 26 2015 13:38 UTC

hint [8/8]

Second

function palindrome(str) {
  str = str.toLowerCase().replace(/[\W_]/g, '');
  for(var i = 0, len = str.length - 1; i < len/2; i++) {
    if(str[i] !== str[len-i]) {
      return false;
    }
  }
  return true;
}

Code Explanation:

We use regular expressions to replace any uppercase letter into a lowercase. Then we check if the string is the same as the reversed string using split() to split the original string by characters, then reverse and then join it back together.

Credits:

If you found this page useful, you can give thanks by copying and pasting this on the main chat: Thanks @Rafase282 @abhisekp

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