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

12th
Oct 2015
Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

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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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

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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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

hint [3/8]

Hint: 1

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

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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

hint [4/8]

Hint: 2

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

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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

hint [5/8]

Hint: 3

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

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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

hint [6/8]

Spoiler Alert!

687474703a2f2f7777772e796f75726472756d2e636f6d2f796f75726472756d2f696d616765732f323030372f31302f31302f7265645f7761726e696e675f7369676e5f322e676966.gif

Solution ahead!

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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:31
hint
CamperBot
@camperbot
Oct 12 2015 07:31

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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Ali-Haider5
@Ali-Haider5
Oct 12 2015 07:33
hint
CamperBot
@camperbot
Oct 12 2015 07:33

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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