Oops, good point - I had a typographical error there. My apologies for
not thinking this through.
Here's a fixed version, with example arguments.
(3 :0) 2 3
'x y'=. y
x + y
)
5
Multi-line statements, like this one, tend to be clumsy,
interactively, but that does not mean that they do not work.
You could use ('x y')=. y but those parenthesis serve no mechanical
purpose. (The parenthesized form is to force J to use a variable's
value rather than its name, and that's not relevant here, especially
since x is undefined and y is a noun.) If you like the emphasis they
confer, you can include them - but you also need the quotes.
Thanks,
--
Raul
On Mon, Feb 2, 2015 at 9:56 AM, Joe Bogner <[email protected]> wrote:
> On Mon, Feb 2, 2015 at 9:10 AM, Raul Miller <[email protected]> wrote:
>
>> Here's one example of a J lambda syntax:
>>
>> 3 :0
>> (x y)=. y
>> x+y
>> )
>>
>> This differs from Haskell and Scheme lambda syntax in obvious ways,
>> but it's viable.
>>
>
> How would this get called / invoked?
>
> Using the scheme example[1]:
>
> (((lambda (x)
> (lambda(y)
> (+ x y))) 1) 2)
>
> 3
>
> Using the haskell example[2]:
>
> λ (\x y -> x+y)(1)(2)
> 3
>
> How would I use the J example?
>
> [1] - http://tryscheme.sourceforge.net/
> [2] - https://tryhaskell.org/
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