## Intro π

Problem solving is an important skill, for your career and your life in general.

That's why I take interesting katas of all levels, customize them and explain how to solve them.

## Understanding the Exerciseβ

First, we need to understand the exercise! If you don't understand it, you can't solve it!.

My personal method:

1. Input: What do I put in?
2. Output: What do I want to get out?

### Today's exercise

Source: Codewars

Write a function `isPalindrome`, that accepts one parameter: `myString`.

Given a string, e.g. `"Abba"`, return if this string is a palindrome (case-insensitive), e.g. `true`.

A palindrome is a word [...] which reads the same backward as forward, such as `racecar`.

Input: a string.

Output: a boolean.

## Thinking about the Solution π­

I think I understand the exercise (= what I put into the function and what I want to get out of it).

Now, I need the specific steps to get from input to output.

I try to do this in small baby steps:

1. Transform the input string to lowercase
2. Get the backward version of the lowercase string (= reverse it)
3. Check if the forward string is the same as the backward string

Example:

• Input: `"Abba"`
• Transform the input string to lowercase: `"abba"`
• Get the backward version of the lowercase string: `"abba"`
• Check if the forward string is the same as the backward string: `true`
• Output: `true` β

## Implementation β

``````function isPalindrome(myString) {
// transform the input string to lowercase
const lowercaseInput = myString.toLowerCase();

// to have a similar wording
const forward = lowercaseInput;

// get the backward version of the lowercase string
const backward = lowercaseInput.split("").reverse().join("");

// check if the forward string is the same as the backward string
return forward === backward;
}
``````

### Result

``````console.log(isPalindrome("Abba"));
// true β

console.log(isPalindrome("hello"));
// false β
``````

## Playground β½

You can play around with the code here

## Next Part β‘οΈ

Great work!

We learned how to use `toLowerCase`, `split`, `reverse`, `join`.

I hope you can use your new learnings to solve problems more easily!

Next time, we'll solve another interesting kata. Stay tuned!

If I should solve a specific kata, shoot me a message here.

If you want to read my latest stuff, get in touch with me!