Re: Difference between method and block - with examples

On 2011-06-14 Tue, at 11:44 PM, Oscar Martinez wrote:
> n := 10
> mthd := method(i, i + n)
> blk := block(i, i + n)
> foo := method(n = 20; mthd(3))
> bar := method(n = 30; blk)
> 
> mthd(1) println # 11 (as expected)
> blk call(2) println # 12 (as expected)
> foo println # 23 (as expected)
> bar call(4) println # 34 (but really expected 14)
> 
> Actually, 34 is what you are getting because in "bar" you are updating the existing "n" slot :)

Right. 

	n = 20 

is compiled as:

	updateSlot("n", 20)

and the Locals proto (which method's basically clone to use as a locals scope) overrides updateSlot to have a slightly different behavior in that it sets it on self if the slot is found there. I don't know if this is clearly described in the docs but the motivation is to being able to write:

	n = 20 

instead of:

	self n = 20

I'm not sure if that was the right choice. It isn't done for :=.

- Steve