Lesson 18 - Part 2 Functions (import and return)

Remember that a function has brackets that we haven't been doing anything with so far and that variables inside of a function are in their own separate world (so far).

These brackets serve to import things into the function.

Try the following program:

Note how y and z's values get "teleported" into the sq() function but inside the sq() function they're treated like the variable x!

Here's another example imports multiple values

Here we see variables a and b inside of the brackets for the add() function.

The definition of the add function has variables x and y inside the brackets.

What this means is that any variables coming into the add function are now defined as variables x and y inside of the add() function.

So within the add() function, x = the value of a at the time of the callout, and y = the value of b at the time of the callout

Let's try another example. In this case we're simulating a dice roller.

Other things to note:

• You can call out functions IN other functions!
• You can make a function call itself! This is called recursion! It's like Inception them movie, a dream within a dream, a program within a program.
• Functions should be used anywhere you have repetitive code. It should either save you lines or simplify your program