Re: [groovy-user] Exact difference between Script class and Binding class in groovy.

Am 16.08.2012 08:00, schrieb antoaravinth:
> Consider this code:
>
> x = 10
> 10.times{
>      x++
> }
> assert ​binding.getVariable("x") == 20
> As far, I'm concerned this is what happening in the above code: Script class
> has a reference to the variable x which has value 10 and it calls the times
> closure which will access the variable x from Script. So basically the
> scoping of x is been done by Script class.
>
> But I wonder when binding came into the picture? In sense, I haven't called
> new Binding() or anything, but still its there.

Ok... You code above is a subclass of Script, Script has a parameterless 
constructor Script() which creates a new Binding for this script. If the 
code above is executed from the command line for example, this way is 
used to set the Binding. Now, in your example above, "x" is not part of 
the Script subclass, instead it is an information stored in the Binding 
of the Script. The scoping of x is the binding, which is in your case 
the whole script. But you could share bindings among several scripts, in 
which case the scoping would be more than just the script and you would 
have something like a global variable.

> I'm bit confused with it. What is the exact use of binding? Does Script
> class creates binding, if so that is how it manages scoping of x within
> times method?