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

5th
Dec 2015
overui
@overui
Dec 05 2015 15:49
hint
CamperBot
@camperbot
Dec 05 2015 15:49

hint [1/9]

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

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

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

overui
@overui
Dec 05 2015 15:49
hint
CamperBot
@camperbot
Dec 05 2015 15:49

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.

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

overui
@overui
Dec 05 2015 15:49
hint
CamperBot
@camperbot
Dec 05 2015 15:49

hint [3/9]

Hint: 1

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

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

overui
@overui
Dec 05 2015 15:49
hint
CamperBot
@camperbot
Dec 05 2015 15:49

hint [4/9]

Hint: 2

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

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

overui
@overui
Dec 05 2015 15:50
hint
CamperBot
@camperbot
Dec 05 2015 15:50

hint [5/9]

Hint: 3

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

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

overui
@overui
Dec 05 2015 15:50
hint
CamperBot
@camperbot
Dec 05 2015 15:50

hint [6/9]

Spoiler Alert!

687474703a2f2f7777772e796f75726472756d2e636f6d2f796f75726472756d2f696d616765732f323030372f31302f31302f7265645f7761726e696e675f7369676e5f322e676966.gif

Solution ahead!

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

overui
@overui
Dec 05 2015 15:50
hint
CamperBot
@camperbot
Dec 05 2015 15:50

hint [7/9]

First

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

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

overui
@overui
Dec 05 2015 15:50
hint
CamperBot
@camperbot
Dec 05 2015 15:50

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.

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

overui
@overui
Dec 05 2015 15:50
hint
CamperBot
@camperbot
Dec 05 2015 15:50

hint [9/9]

Recursive Solution

function palindrome(str) {
// make all letters lowercase and remove non-alphanumeric characters
  str = str.toLowerCase();
  str = str.replace(/[^a-z|1-9]/g, "");

  // if the length of the string is 0 then it is a palindrome
  if (str.length === 0){
    return true;
  }
  // if the first letter and the last letter of the string do not equal eachother then it is not a palindrome
  if (str[0] !== str[str.length-1]){
    return false;
  }
  //Else, run the function without the first and last characters.
  else{
    return palindrome(str.slice(1,str.length - 1));
  }
}

Credits:

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

NOTE: Please add your username only if you have added any relevant main contents to the wiki page. (Please don't remove any existing usernames.)

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

overui
@overui
Dec 05 2015 15:55
Bonfire: Find the Longest Word in a String
CamperBot
@camperbot
Dec 05 2015 15:55

:fire:Bonfire: Find the Longest Word in a String :link:

function findLongestWord(str) {
  return str.length;
}

findLongestWord('The quick brown fox jumped over the lazy dog');

Return the length of the longest word in the provided sentence.

more info:  bf details | bf links | hint

overui
@overui
Dec 05 2015 15:55
hint
CamperBot
@camperbot
Dec 05 2015 15:55
These hints depend on people like you! Please add to this :point_right: Bonfire's Wiki Hints Page