java-script comman operator with different object

Question

I was going through a library of a javascript plugin which was using this syntax. what does the following statement means syntactically in JavaScript

simpleCart = function (options) {
    },$engine,cartColumnViews;

later the code uses simpleCart in many places. What does simpleCart refer to at the end of the statement.

EDIT1 : http://simplecartjs.org/assets/js/simpleCart-latest.php search for "main simpleCart object"

Preceded by `var`: http://jsfiddle.net/p9tEg/. Without `var`: http://jsfiddle.net/p9tEg/1/ — Tim M., Mar 06 '13 at 01:48
Without the `var` on that fiddle `p9tEg/1` I get an error message in the console: `ReferenceError: $engine is not defined` — Stephen P, Mar 06 '13 at 01:54
@epascarello i am not missing var. I have pasted the link of the source code. — David, Mar 06 '13 at 23:40

Dave · Answer 1 · 2013-03-06T02:17:31.140

5

My psychic powers tell me there's a var just before that (or just before a list of other values before that).

var a,b=2,c;

will define a, b and c, and set b to 2. So the code you found is setting simpleCart to a function, and defining $engine and cartColumnViews for future use (see the comments for really deep JavaScript details which are beyond the scope of this question!).

edited Mar 06 '13 at 02:17

answered Mar 06 '13 at 01:47

Dave

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Assuming there is a `var` at the start, the OP code creates all the variables first, then assigns a function to `simpleCart` since declarations are processed before any code is executed. ;-) – RobG Mar 06 '13 at 02:08
well what do you know, seems it is. I had to make a jsfiddle to convince myself: http://jsfiddle.net/sfZPX/1/ – Dave Mar 06 '13 at 02:11
well the answer is still valid anyway! – Dave Mar 06 '13 at 02:12

score 0 · Answer 2 · answered Mar 06 '13 at 01:44

0

That's very strange code, but the function and the $engine don't do anything so the result is essentially the same as simpleCart = cartColumnViews.

answered Mar 06 '13 at 01:44

Niet the Dark Absol

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It's only "not correct" if there's a `var` we haven't been told about. The OP specifically said they were comma operators, so I went with it. – Niet the Dark Absol Mar 06 '13 at 01:49
Practically it's the same as `throw 'referenceError: $engine is not defined'`. :-) – RobG Mar 06 '13 at 02:13

score 0 · Answer 3 · edited May 23 '17 at 12:27

0

I'm assuming it is variable declaration. simpleCart is variable that function assigned to it.

Better reference here: var functionName = function() {} vs function functionName() {}

edited May 23 '17 at 12:27

Community

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answered Mar 06 '13 at 01:52

ins429

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java-script comman operator with different object

3 Answers3