Checking for Palindromes in Google Sheets with Apps Script
A palindrome is a word, phrase, number, or sequence of characters that reads the same forward and backward, ignoring spaces, punctuation, and capitalization (in the case of letters). In other words, a palindrome remains unchanged when its order is reversed.
For example, here are some examples of palindromes:
"level"
"madam"
"racecar"
"A man, a plan, a canal: Panama"
"12321"
"deed"
In each of these examples, the sequence of characters reads the same from left to right as it does from right to left. Palindromes can be formed by individual letters, entire words, or even complete sentences.
The above code defines a function called IS_PALINDROME that checks whether a given input string is a palindrome. Here's a step-by-step breakdown of the code:
Convert the input str to a string explicitly using the toString() method. This step ensures that the input is treated as a string, even if it was originally a different data type.
Convert the string to lowercase using the toLowerCase() method. This step ensures that the comparison is case-insensitive.
Remove any non-alphanumeric characters from the string using the replace() method with a regular expression /[^a-z0-9]/g and replacing them with an empty string. This step eliminates any characters that are not letters or digits from the string.
Iterate over the characters in the string using a for loop. The loop variable i starts at 0 and increments until it reaches half of the string length (str.length/2).
Inside the loop, compare the character at index i with the character at the corresponding index from the end of the string (str.length-1-i).
If the characters being compared are not equal, it means the string is not a palindrome. In this case, the function immediately returns false to indicate that the input string is not a palindrome.
If the loop completes without finding any unequal characters, it means the string is a palindrome. The function returns true to indicate that the input string is a palindrome.
In summary, the IS_PALINDROME function checks whether a given input string is a palindrome by converting the string to lowercase, removing non-alphanumeric characters, and then comparing characters from both ends of the string towards the middle. If all the characters match, the function returns true, indicating that the string is a palindrome. If any characters don't match, the function returns false, indicating that the string is not a palindrome.
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