ELI5: Explain Like I'm 5

Code duplication

Hey kiddo! Do you know what copying is? You take a pencil and paper and you write the same thing again and again, right? That's what we call duplication in the coding world.

When we write a computer program, we use some lines of code to make a computer do what we want it to do. But sometimes we make the same thing happen again and again in different parts of the code. That's called code duplication.

Imagine you're building a house of blocks. You realize you have two blocks that look exactly the same. Instead of using two blocks, you can use only one and save the other for later. That's what we do when we want to avoid code duplication. We use a single block of code in multiple parts of the program.

Why is it important to avoid code duplication? There are a few reasons. First, if we duplicate code everywhere, it will become harder to make changes to the program. If we need to make a change, we will have to look for every place where we wrote the same code and make the change one by one. That would be very time-consuming and we might make mistakes along the way.

Second, when we have duplicated code, any bugs or errors in that code will also be duplicated. So if there's a problem with that code, we'll have to fix it in many places, which again is time-consuming and prone to error.

That's why we try to avoid code duplication. We can reuse the same code in different parts of the program, which makes it easier to make changes and fix errors. Plus, it makes our code look more organized and easier to read.