Question

I’ve just started working with javascript and I saw something which I can’t explain.
I have js file named TestClass.js and its the following:

TestClass.SetError = function (errorDescription, errorCode, typedErrorCode)
{
    alert("SetError ");
}  

function SetError2(errorCode)
{
    alert("SetError2 ");
}  

Can someone please explain me the difference between the SetError and SetError2?

Answer 1

The first piece of code (SetError) contains Anonymous Function Expression, where the second piece of code (SetError2) cotains a Function Declaration. See Function Declarations vs. Function Expressions

Another good article: Named function expressions demystified

Excerpt:

function declarations are parsed and evaluated before any other
expressions are. Even if declaration is positioned last in a source,
it will be evaluated foremost any other expressions contained in a
scope.

That’s basically the main difference. It’s not huge but worth being aware of.