Any reason for assigning block parameter in inject:into:
tim Rowledge
tim at rowledge.org
Sun Apr 29 17:03:43 UTC 2007
On 29-Apr-07, at 9:17 AM, Keith Hodges wrote:
>
> What you are saying is that the named parameter that comes into the
> method which looks like a variable, and you use it like a variable
> is actually a constant within the context of that method. Its
> actually counter intuitive.
Perhaps if you think of it along the lines of:-
a) names in a method are just local tags for programmer convenience
so that you don't have to keep it all in your head as you read/write
code,
b) objects passed into the method as parameters are bound to the
parameter tags;
it might help.
Assigning some new object to the tag used for a parameter is
confusing and pointless because it can have no effect outside the
local context despite *looking like* it might replace the object to
someone not familiar. To prevent that confusion, the compiler
prevents the assignment.
tim
--
tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
"Wibble" said Pooh the stress beginning to show.
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