JavaScript Functions
A group of statements that is put (or defined) once and then can be used (by reference) repeatedly on a web page. Also known as subprogram, procedure, subroutine.
A function is written as a code block (inside curly {} braces), preceded by the function keyword.
Syntax JS Function
function function_Name(parameter1, parameter2, parametrn)
{
Some code to executed
}
Example
Output
Advantages of functions
There are some advantages of using functions:
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Numbers of lines of code is reduced
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Code becomes to easier to read and understand
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Code becomes easier to maintain as changes need to be made only at a single location instead multiple locations
Functions Parameters
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Facility to pass different parameters while a calling a function
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Passed parameters can be captured inside the function and any manipulation can be done over those parameters
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A function can take multiple parameters separated by comma.
Function Return
When JavaScript reaches a return statement, the function will stop executing. If the function was invoked from a statement, JavaScript will "return" to execute the code after the invoking (calling) statement. Functions often compute a return value. The return value is "returned" back to the "caller":
Output
