Game Development Reference
In-Depth Information
36 //Output current score and exit function
37 return Score;
38 }
39 }
The following is the breakdown of the code present for code sample 1-8:
•
Line 08
: A private, integer class variable
Score
is declared to keep track
of a sample score value. This variable will be used later in the function
UpdateScore
.
•
Lines 11, 23, and 28
: The class
MyScriptFile
has three functions (sometimes
called methods or member functions). These are
Start
,
Update
, and
UpdateScore
.
Start
and
Update
are special functions that Unity provides,
as we'll see shortly.
UpdateScore
is a custom function for
MyScriptFile
.
•
Line 28
: The
UpdateScore
function represents a complete block of code
between lines 29 and 38. This specific function should be invoked every time
the game score must change. When called, the code block (lines 29-38) will
be executed sequentially. In this way, functions offer us code recyclability.
•
Lines 14-19
: The
UpdateScore
function is called several times during the
Start
function. For each call, the execution of the
Start
function pauses
until the
UpdateScore
function completes. At this point, the execution
resumes in the next line.
•
Line 28
:
UpdateScore
accepts two parameters or arguments. These are
an integer
AmountToAdd
and a Boolean
PrintToConsole
. Arguments act
like inputs we can plug in to the function to affect how they operate. The
AmountToAdd
variable expresses how much should be added to the current
Score
variable, and
PrintToConsole
determines whether the
Score
variable
should be shown in the
Console
window when the function is executed.
There is theoretically no limit to the number of arguments a function can
have, and a function can also have no arguments at all, such as the
Start
and
Update
functions.
•
Lines 31-34
: Here, the score is actually updated and printed to
Console
,
if required. Notice that the
PrintToConsole
argument has a default value
of
true
already assigned to the function declaration in line 28. This makes
the argument optional whenever the function is called. Lines 14, 15, and 16
explicitly override the default value by passing a value of
false
. Line 19,
in contrast, omits a second value and thereby accepts the default of
true
.
