why we use functions in javascript? javascript lecture 3 - how to do this
A function is a JavaScript procedure—a set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it. See also the exhaustive reference chapter about JavaScript functions to get to know the details.
Syntax:-
function name(parameter1, parameter2, parameter3) {
// code to be executed
}
Function parameters are listed inside the parentheses () in the function definition.
Function arguments are the values received by the function when it is invoked.
Inside the function, the arguments (the parameters) behave as local variables.
A Function is much the same as a Procedure or a Subroutine, in other programming languages.
Function Invocation:-
The code inside the function will execute when "something" invokes (calls) the function:
When an event occurs (when a user clicks a button).
When it is invoked (called) from JavaScript code.
Automatically (self invoked).
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