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Conor Vanoystaeyen
16,687 Pointspalindrome
I need to write js code that can see if a word is a palindrome but must be done with the function .slice and can not use loops or arrays. can someone help? don't now how to begin.
const isPalindrome = str => {
};
Conor Vanoystaeyen
16,687 PointsRich Donnellan
it is a school assignment it is an extra out of the obligatory but would like to be able to do this but do not understand the logic with the slice function with a for loop I can do it too but unfortunately it can not be used.
so I thought I was going to hear if treehouse community can help me with this problem.
1 Answer
jucliofonseca
959 PointsHi Conor!
These limitations ask for some gold and old recursion: https://en.wikipedia.org/wiki/Recursion
You don't need to check all the letters of a word at the same time to discover a palindrome. Just two are necessary: the first and the last. If they are different, the word for sure is not a palindrome. Perceive that the word with the first and last letters removed must be a palindrome too!
e.g.:
'arara' => 'rar' => 'a' all are palindrome.
'twittiwt' => 'wittiw' => 'itti' => 'tt' all are palindrome too!
'wolf' is not a palindrome :/
'sims' => 'im' is not a palindrome :(
I hope this helps! :)
Conor Vanoystaeyen
16,687 PointsThx Jucélio this certainly helps but do not know how I can take a last character if the word can be longer or shorter than a number of letters so start = 0 but the end =?
jucliofonseca
959 PointsHey Conor!
You can use the str.slice(-1); to extract the last character. Please check the MDN Documentation for more information about negative numbers as parameter.
;)
Rich Donnellan
Treehouse Moderator 27,671 PointsRich Donnellan
Treehouse Moderator 27,671 PointsWhy are you limited to using
.slice? Sounds like a school assignment ...