What's your function?

In a nutshell, a function is a block of code written to perform a specific task that can be called as many times as we need from other parts of our program. As an example, if we had a function called EatAnApple , it would be like this:

var int i, NumberOfSlices;

function EatAnApple()
{
    WashApple();
    NumberOfSlices = SliceApple();
    for(i=0; i<NumberOfSlices; i++)
        ChewAppleSlice();
    ThrowAwayAppleCore();
}

Instead of having to write out each line every time we want to eat an apple, we just call the EatAnApple() function. As a more practical example from our own code, let's take a look at our AwesomeWeapon :

function UpgradeWeapon()
{
    if(CurrentWeaponLevel < MAX_LEVEL)
        CurrentWeaponLevel++;

    FireInterval[0] = FireRates[CurrentWeaponLevel - 1];

    if(IsInState('WeaponFiring'))
    {
        ClearTimer(nameof(RefireCheckTimer));
        TimeWeaponFiring(CurrentFireMode);
    }

    AddAmmo(MaxAmmoCount);
}

Instead of having all of...