From: Dave Thomas <dave@...>
Date: 2008-05-27T01:41:55+09:00
Subject: Re: [PATCH] lambda with normal block syntax


On May 26, 2008, at 11:31 AM, Yukihiro Matsumoto wrote:

> |reads better to me, as does
> |
> |   twotimes = fn x -> { 2 * x }
> |
> |as does
> |
> |   twotimes = λ x -> { 2 * x }
>
> Interesting.  What is the rationale for having both prefix  
> (fn or λ)
> and -> symbol?  Honoring functional languages tradition?  I prefer
> incomplete assignment model described in the prior post.

Partly that, and partly because I wondered if the delimiter made  
parsing easier. If not, then I'd be very happy with losing the -> :)

>
>
> |In fact, given a change that allows block arguments to be like method
> |arguments, then maybe no other change is needed. We can always alias
> |lambda to something shorter, and then everyone is happy
> |
> |   n_times = λ { |n=2|   λ {|val| n*val}}
>
> In that case, default values patch for block parameters are must.

and block params?



Dave