Re: Another example for syntactically lightweight closures

[Mark Hamburg <mhamburg@...>]

on 2/7/08 11:53 PM, Fabien at fleutot+lua@gmail.com wrote:

> 
>> A more elaborate example:
>>         t :where |x| x.shoesize > 7 :sort |a,b| a.age < b.age :print
> 
> This would read as the invocation of method sort on number 7. You probably
> don't want to allow to pass  them  as  parentheses-less parameters.
> 
> Notice also that such short functions can used at the beginning of a
> statement, as in (|x| print(x))(42). You might therefore have to use
> statements separators for things like: "(|x|foo(x)) (y) (|x|foo(x)) (y)",
> which can be two statements or a currified 4 parameters function.

This could argue for a syntax more like:

    t :where<< x | x.shoesize > 7 >>
        :sort<< a, b | a.age < b.age >>
        :print()

I haven't looked into whether there are lookahead issue if one wanted to
make the | optional in functions without parameters.

Mark