Page 195 - CITS - Computer Software Application -TT

COMPUTER SOFTWARE APPLICATION - CITS

Note: A function name must start with a letter or an underscore. Function names are NOT case-sensitive.
Tip: Give the function a name that reflects what the function does!
Call a Function
To call the function, just write its name followed by parentheses ():
Example:

In our example, we create a function named myMessage().
The opening curly brace { indicates the beginning of the function code, and the closing curly brace } indicates the
end of the function.
The function outputs “Hello world!”.
Function Name and Scope:
Function names are case-insensitive. However, it’s good practice to follow a consistent naming convention.
Functions have their own scope, meaning variables inside a function are not accessible outside of it.
Function Parameters:
Parameters allow us to pass data into functions. They are defined within the parentheses during function
declaration.
Example:

Function Body:
The function body contains the code to be executed when the function is called.
Parameters and Return Values
Functions can accept parameters and return values, making them versatile and adaptable to various scenarios.
There are three types of parameters:
• Required Parameters: Must be passed during the function call.
• Default Parameters: Have default values and can be omitted.
• Variable-length Parameter Lists: Allow an arbitrary number of arguments.
Example:

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CITS : IT&ITES - Computer Software Application - Lesson 47 - 62