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

21st
Sep 2015
Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:06
hint
CamperBot
@camperbot
Sep 21 2015 09:06

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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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:06
hint
CamperBot
@camperbot
Sep 21 2015 09:06

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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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:06
hint
CamperBot
@camperbot
Sep 21 2015 09:06

hint [3/8]

Hint: 1

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

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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:07
hint
CamperBot
@camperbot
Sep 21 2015 09:07

hint [4/8]

Hint: 2

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

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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:07
hint
CamperBot
@camperbot
Sep 21 2015 09:07

hint [5/8]

Hint: 3

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

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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:07
hint
CamperBot
@camperbot
Sep 21 2015 09:07

hint [6/8]

Spoiler Alert!

687474703a2f2f7777772e796f75726472756d2e636f6d2f796f75726472756d2f696d616765732f323030372f31302f31302f7265645f7761726e696e675f7369676e5f322e676966.gif

Solution ahead!

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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:07
hint
CamperBot
@camperbot
Sep 21 2015 09:07

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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Thomson Muriyadan
@thedigitalmonk
Sep 21 2015 09:15
hint
CamperBot
@camperbot
Sep 21 2015 09:15

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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