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35 lines
1.1 KiB
35 lines
1.1 KiB
\subsection{Declaration}
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What is a Function?
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We have been learning Functional programming, how come we haven't come across Functions until now?
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Because I said so.
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\par
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A Function allows use to assign a block of code to a name which allows us to eaily repeat the execution of that code without having
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to retype the code.
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Consider the code.
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\begin{lstlisting}[caption={Function Candidate Example}]
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def PrintHello():
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print ``Hello''
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PrintHello()
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print ``Goodbye''
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PrintHello()
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Print ``I said Goodbye!''
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\end{lstlisting}
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This code will output the following:\\
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\pigOut{Hello\\
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Goodbye\\
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Hello\\
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I said Goodbye!}\\
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As you can see we are declaring a Function called \pigVar{PrintHello} with the code block \pigVar{print ``Hello''}.
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As may have noticed when the code gets to the declaration of the Function it does not execute the code block, instead it
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saves the code block for execution later when the Function name is called.
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To call the function we use the Function name followed by opening and closing parentheses, \pigVar{PrintHello()}.
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\subsection{Returns}
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\subsection{Parameters}
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\subsection{Recursion}
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