Functions
What is a Function?
Functions allow you to reuse code
- Performs a specific task
- Begins with the keyword function followed by the function name and parentheses ( )
- Parameters or arguments will be placed inside the parentheses ( )
- Braces { } follow the parentheses ( )
- Your instructions (code block) will be inside of the braces { }
- The return keyword exits a function
- You must call or invoke the function for it to run the specific task
The Structure of a Function
- Keyword function starts the function
- greeting is the function name
- phrase is the parameter
- return is the output of the function
- greeting('Aloooooooha') is calling/invoking the function to run the specific task
Parameters and Arguments
- A parameter is a piece of information (a placeholder) that the function needs
- An argument is a piece of information that is passed from a function call into the function
Information that the function needs
Return Values
The value that the function returns
Scope
Access to your variables based on location
- Global variables can be accessed throughout your entire program
- Local variables can be used only inside the function in which they are declared