Javascript variable initialization syntax

Question

I'm working with a javascript (Ext JS 4) project, and I came across this:

{
    init: function() {
        var me = this, desktopCfg;
        ...
    }
}

What exactly is being assigned to 'me' in this situation?

I think I figured this out: It's basically initializing two variables but only supplying a value to the first — Casey Flynn
– Casey Flynn, Commented Dec 8, 2011 at 20:19

Quentin · Accepted Answer · 2011-12-08 20:21:08Z

5

This:

var me = this, desktopCfg;

Is equivalent to:

var me = this;
var desktopCfg;

as = has higher precedence than ,.

See also: the manual for var which has examples of this syntax.

answered Dec 8, 2011 at 20:21

Quentin

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Comments

hackartist · Accepted Answer · 2011-12-08 20:21:18Z

1

the object this. the parser goes down the instructions and sees a comma separated list of the two instructions var me = this; desktopCfg; so the variable me gets the whole object that it is in.

answered Dec 8, 2011 at 20:21

hackartist

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