How to Write a Difficult Palindrome Detector in JavaScript

Learn how to create a function that accurately detects palindromic strings in JavaScript, handling various edge cases effectively.
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This video is based on the question https://stackoverflow.com/q/67006220/ asked by the user 'Misha Yanenko' ( https://stackoverflow.com/u/15583132/ ) and on the answer https://stackoverflow.com/a/67006400/ provided by the user 'Som Shekhar Mukherjee' ( https://stackoverflow.com/u/11719314/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Palindromes in JavaScript: A Step-by-Step Guide

When it comes to string manipulation in programming, palindromes often present an interesting challenge. A palindrome is a word, phrase, number, or other sequences of characters that reads the same forward and backward (e.g., "madam" or "121"). In this guide, we will unravel how to write a JavaScript function that detects palindromic strings while addressing common pitfalls.

The Challenge: Creating a Palindrome Detector

Our task is to implement a function called detectPalindrome, which will assess whether a given string is a palindrome. The function should also manage various scenarios, providing specific outputs as needed:

If the provided argument is not a string, it should return 'Passed argument is not a string'.

If the given string is empty, the return value should be 'String is empty'.

For a valid palindrome, it should return 'This string is palindrome!'.

For a non-palindromic string, the output should be 'This string is not a palindrome!'.

Analyzing the Existing Code

The initial code implementation looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Identifying Issues

Missing Type Check: The original code does not verify if the argument is a string, which could lead to unexpected behavior.

Order of Checks: The check for an empty string occurs after attempting to create the reversed string. This will cause an error for empty inputs.

The Solution: Revamped Code

Let’s enhance the function with a strategic approach that includes all necessary checks before proceeding to evaluate if a string is a palindrome.

Step-by-Step Approach

Type Validation: Use typeof to ensure the input is a string.

Empty String Check: Validate the input for being an empty string before all other operations.

Palindrome Check: Only if the input passes the above checks, proceed to reverse the string and check for equality.

Revised Code Implementation

Here is how the corrected function looks:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following a structured approach to implement our palindrome detector, we ensure that our function can handle various edge cases gracefully. Remember to validate the input before processing and phrase appropriate responses based on the checks. Now, you can confidently detect palindromic strings with ease!

Feel free to test the function with various inputs and modify it further to suit your needs. Happy coding!

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