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

6th
Jan 2016
joelauerbach0
@joelauerbach0
Jan 06 2016 01:49
hint
CamperBot
@camperbot
Jan 06 2016 01:49

hint [1/9]

## :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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joelauerbach0
@joelauerbach0
Jan 06 2016 01:50
hint
CamperBot
@camperbot
Jan 06 2016 01:50

hint [2/9]

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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joelauerbach0
@joelauerbach0
Jan 06 2016 01:50
hint
CamperBot
@camperbot
Jan 06 2016 01:50

hint [3/9]

Hint: 1

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

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joelauerbach0
@joelauerbach0
Jan 06 2016 01:53
hint
CamperBot
@camperbot
Jan 06 2016 01:53

hint [4/9]

Hint: 2

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

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joelauerbach0
@joelauerbach0
Jan 06 2016 01:53
hint
CamperBot
@camperbot
Jan 06 2016 01:53

hint [5/9]

Hint: 3

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

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joelauerbach0
@joelauerbach0
Jan 06 2016 01:53
hint
CamperBot
@camperbot
Jan 06 2016 01:53

hint [6/9]

Spoiler Alert!

687474703a2f2f7777772e796f75726472756d2e636f6d2f796f75726472756d2f696d616765732f323030372f31302f31302f7265645f7761726e696e675f7369676e5f322e676966.gif

Solution ahead!

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joelauerbach0
@joelauerbach0
Jan 06 2016 01:53
hint
CamperBot
@camperbot
Jan 06 2016 01:53

hint [7/9]

First

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

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joelauerbach0
@joelauerbach0
Jan 06 2016 01:53
hint
CamperBot
@camperbot
Jan 06 2016 01:53

hint [8/9]

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.

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