Static variables in an anonymous function

Question

I'm trying to mimic static variables on a JavaScript function, with the following purpose:

$.fn.collapsible = function() {
  triggers = $(this).children('.collapse-trigger');
  jQuery.each(triggers, function() {
    $(this).click(function() {
      collapse = $(this).parent().find('.collapse');
    })
  })
}

How do I save the "collapse" object so it doesn't have to be "found" on each call? I know that with named functions I could do something like "someFunction.myvar = collapse", but how about anonymous functions like this one?

Thanks!

score 13 · Accepted Answer · answered Mar 15 '09 at 03:35

13

You can save your variable in the function, using either functioName.myVar = value or arguments.callee.myVar = value if you don't have the current function name.

arguments.callee is the current function you are in.

answered Mar 15 '09 at 03:35

Vincent Robert

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1

What about an arrow function? – Brain2000 Jun 15 '19 at 19:03

score 10 · Answer 2 · answered Mar 15 '09 at 03:38

For anonymous function you could use a function that returns a function.

For instance:

var myAnonymousFunction = (function(){
    var myFirstStatic = $("#anElement");
    var anotherStatic = true;
    return function(param1,param2) {
        // myFirstStatic is in scope
        // anotherStatic also
    }
})();

Should work like a charm and you're assured initialisation code for statics is only executed once.

score 2 · Answer 3 · edited May 23 '17 at 12:32

2

It seems that a better answer to this question is found elsewhere on Stack Overflow.

In short, you can actually give anonymous functions names without polluting the namespace, yet still allow self-referencing.

mything.prototype.mymethod = function myKindOfFakeName() {
    myKindOfFakeName.called = true;
}

edited May 23 '17 at 12:32

Community

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answered Jan 31 '12 at 01:07

Chuck

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score 0 · Answer 4 · answered Mar 15 '09 at 02:39

0

As long as you're assigning the function to a variable like that, you should be able to access it as $.fn.collapsible, and thus assign variables as $.fn.collapsible.myvar.

answered Mar 15 '09 at 02:39

Chuck

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That wouldn't work because that's not the function I'm trying to attach a variable to. Thanks. – Ivan Mar 16 '09 at 23:43

Static variables in an anonymous function

4 Answers4