From: Ralph Shnelvar <ralphs@...32.com>
Date: 2012-03-08T01:32:20+09:00
Subject: Re: Proc.new v. lambda

Bartosz,

Wednesday, March 7, 2012, 8:25:57 AM, you wrote:

BD> Really, you could have checked it yourself.

irb(main):001:0>> a = Proc.new{}
=>> #<Proc:0xca1cb8@(irb):1>
irb(main):002:0>> b = lambda{}
=>> #<Proc:0x141af50@(irb):2 (lambda)>
irb(main):003:0>> a.lambda?
=>> false
irb(main):004:0>> b.lambda?
=>> true

BD> -- Matma Rex

First you have to know there is a lambda? function.

What I did do was:
irb(main):002:0> p = Proc.new {42}
=> #<Proc:0x2916048@(irb):2>
irb(main):003:0> l = lambda {43}
=> #<Proc:0x2aceb80@(irb):3 (lambda)>
irb(main):004:0> defined? p
=> "local-variable"
irb(main):006:0> defined? l
=> "local-variable"

irb(main):007:0> p.class
=> Proc
irb(main):008:0> l.class
=> Proc

So, given there is a lambda? function, why not a proc? function?


In terms of design, why isn't lambda a super or sub class of Proc?