/usr/share/doc/sludge/SLUDGEDevKitHelp/Functions_(subs).html is in sludge-doc 2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<TITLE>Functions (subs)</TITLE>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<BODY>
<HR>
<div align="center"><img id="headerGraphic" src="images/sludge300.png" alt="SLUDGE"/></div>
<h2>Functions (subs)</h2>
<HR>
<P>
In SLUDGE, a function or "sub" is a group of instructions which make up a particular task. Each function has a name, a set of parameters (values which can be passed in) and a list of commands. A function is defined in the following way:
</P>
<P>
<pre>sub nameGoesHere (parameter1, parameter2, andSoOn) {
# Some code
}</pre>
</P>
<P>
It is also possible to return values from a function. Functions can return any of the data types which can be stored in a <a href="Variables.html">variable</a> (you can therefore use a <a href="The_Multi-Purpose_Stack___Array___Queue_Type.html">stack</a> if you need to return more than one value from a function).
</P>
<P>
<pre>sub addTwoNumbers (a, b) {
return a + b;
}
sub introducePeople (aBod, anotherBod) {
# Let's return a stack containing "A, I'd like you to meet B."
# and "B, this is A!".
return newStack (aBod + ", I'd like you to meet " + anotherBod + ".",
anotherBod + ", this is " + aBod + "!");
}</pre>
</P>
<P>
When calling a function, simply type the name of the function followed by the parameters in brackets. For example:
</P>
<P>
<pre>sub sayNumber (number) {
say (ego, "The number is " + number + ".");
}
sub init () {
# Let's call our addTwoNumbers function
var total = addTwoNumbers (100, 451);
# Now let's call our new sayNumber function
sayNumber (total);
}</pre>
</P>
<P>
If you are calling a function which needs no parameters, make sure you still include an empty set of brackets, otherwise the function will not be called!
</P>
<P>
<pre>sub reallyImportantFunction () {
say (ego, "It's vital that I say this!");
}
sub init () {
# This won't call the reallyImportantFunction...
reallyImportantFunction;
# But this will...
reallyImportantFunction ();
}</pre>
</P>
<H3>More on this subject:</H3>
<P>
<a href="Passing_Functions_as_Variables.html">Passing Functions as Variables</a>
</P>
<P>
<a href="Unfreezable_Functions.html">Unfreezable Functions</a>
</P>
<P class="copyright-notice">SLUDGE and this SLUDGE documentation are <A HREF="Copyright.html">copyright</A> Hungry Software and contributors 2000-2012
</P>
<HR>
</BODY>
</html>
|