A function is created using
the function keyword.
The basic structure of a
function includes the
function name, parentheses,
and a code block enclosed
in curly braces.
Let's define a simple function:
In the above example,
displayValidationError
is the name of the function,
and the code block within {}
is called the function body.
However, simply defining a
function does not trigger the
execution of its code.
To execute a function, we need
to call it by writing the
function's name followed
by the () parentheses:
This displayValidationError() is called
function call or function invocation.
In the above code, we are able to
display the output by defining the
function and then invoking it.
Try adding another statement
containing displayValidationError()
to run the function twice.