isPalindrome
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'use strict';
const firstCharacter = (str) => str.slice(0, 1);
const lastCharacter = (str) => str.slice(-1);
const middleCharacters = (str) => str.slice(1, -1);
const isPalindrome = (str) => {
if (str.length === 0 || str.length === 1) {
return true;
}
if (firstCharacter(str) !== lastCharacter(str)) {
return false;
}
return isPalindrome(middleCharacters(str));
};
console.log('is motor a palindrome?', isPalindrome('motor'));
console.log('is rotor a palindrome?', isPalindrome('rotor'));
console.log('is B a palindrome?', isPalindrome('B'));
console.log('is Lemmy a palindrome?', isPalindrome('Lemmy'));
JavaScript
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