Original subtitles

0 Once you start writing code, you will find out that parts of the code repeat themselves and this is 1

normal in programming. 2

In fact, it's the way it happens. When you find these patterns, 3

you can make them reusable by creating a function. 4

A function is a separate piece of code that can be called on demand by specifying its name in the execution. 5

Let's look at the code. 6

So here we have defined a function add(). 7

To create the new function, we need to use the operator func in GDScript and then the name of the 8

function. 9

And we do need to use the parenthesis, but they can be empty or we can specify additional parameters. 10

Don't forget to add the colons after each function implementation. In the function body 11

we can do something with the provided values and in this case we just add them. 12

And we used another operator called return, which will return the final value. 13

And this value can be used in the previous function that called this one. 14

In this case, I'll be saying adding one plus one and then calling this function. 15

This will add these two elements and will give the result to be printed in the console. 16

Keep in mind that now we can use this. 17

Add as many times as we like to add two values. 18

But this can be a move function. 19

This can be a fire projectile function. 20

This can be whatever you want. 21

There is also another type of function called recursive function, and the recursive function is just 22

like a regular function with the one spin that it calls itself in its own body. 23

As you might imagine, if you've seen the Inception movie, this can lead to infinite execution. 24

And we don't want that. 25

So remember, if you ever implement a recursive function, then you need to make sure that you have 26

something called the exit condition. 27

So the exit condition is usually an IF statement that checks a final condition to break this recursive 28

pattern. 29

This is important to prevent the function running indefinitely. 30

Recursive functions are useful in some particular algorithm implementations in this course.