checkPalindrome()

Step 1: Understanding the Problem

A palindrome is a word, phrase, number, or other sequences of characters that reads the same forward and backward, ignoring spaces, punctuation, and capitalization. We are to create a function, checkPalindrome, that will take a string as input and return true if the string is a palindrome, and false otherwise.

function checkPalindrome(inputString) {
    // We will write our function here.
}

Step 2: Converting the String to Lowercase

Due to palindromes ignoring capitalization, we have to convert our string to lowercase before checking for palindromes. JavaScript provides the toLowerCase() method for this purpose.

function checkPalindrome(inputString) {
    inputString = inputString.toLowerCase();
    // We will proceed with our function here.
}

Step 3: Removing Non-alphanumerical Characters

Next, we need to remove any non-alphanumeric characters from the string, as palindromes ignore spaces and punctuation. We will use the replace function in combination with a regular expression to accomplish this.

function checkPalindrome(inputString) {
    inputString = inputString.toLowerCase().replace(/[^a-z0-9]/g, "");
    // We will proceed with our function here.
}

Step 4: Checking for palindrome

We can check if a string is a palindrome by comparing it with its reverse. If the two match, then our string is indeed a palindrome. JavaScript provides the split, reverse, and join methods to reverse a string.

function checkPalindrome(inputString) {
    inputString = inputString.toLowerCase().replace(/[^a-z0-9]/g, "");
    var reverseString = inputString.split("").reverse().join("");
    // We will proceed with our function here.
}

Step 5: Returning the Result

Finally, we can return the result of our palindrome check. If the original, cleaned-up string is equal to its reverse, the function will return true. If not, it will return false.

function checkPalindrome(inputString) {
    inputString = inputString.toLowerCase().replace(/[^a-z0-9]/g, "");
    var reverseString = inputString.split("").reverse().join("");
    return inputString === reverseString;
}

This completes our checkPalindrome JavaScript function. Now you can test any string to see if it is a palindrome or not!