Palindrome Checker

Solution

const isPalindrome = (str) => {
    return str === str.split('').reverse().join('');
}

Explanation

The function isPalindrome takes a string as an argument and returns a boolean value indicating whether the string is a palindrome. A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward. The function uses the split, reverse, and join methods to reverse the string and then compares it to the original string to determine if it is a palindrome. If the reversed string is equal to the original string, the function returns true, indicating that the string is a palindrome. Otherwise, it returns false.

Example

console.log(isPalindrome('racecar')); // true
console.log(isPalindrome('hello')); // false

Time Complexity

The time complexity of this function is O(n), where n is the length of the input string. This is because the function iterates over each character in the string to reverse it and then compares the reversed string to the original string.

Alternatives

Another way to check if a string is a palindrome is to compare characters from the beginning and end of the string, moving towards the center. This approach can be more efficient as it only requires comparing half of the characters in the string.

const isPalindrome = (str) => {
  if(str.length <= 1) {
    return true;
  } else if(str[0] !== str[str.length - 1]) {
    return false;
  } else {
    return isPalindrome(str.slice(1, str.length - 1));
  }
}