(no subject)

Message-ID:[email protected]

On: Tue, 29 Jan 2008 20:47:41 -0500, “Andrew WC Brown”
[email protected]
wrote:

I’ve seen lambda before but not sure what it does.

A lambda is a fancy name for an anonymous or unbound function. Its
significance comes from the fact that it is completely stateless,
producing no
side effects to its returned result.


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On Jan 29, 2008 8:48 PM, James B. Byrne [email protected] wrote:

Message-ID:[email protected]

On: Tue, 29 Jan 2008 20:47:41 -0500, “Andrew WC Brown” [email protected]
wrote:

I’ve seen lambda before but not sure what it does.

A lambda is a fancy name for an anonymous or unbound function. Its
significance comes from the fact that it is completely stateless, producing no
side effects to its returned result.

I don’t know about that…

irb(main):001:0> a = [1,2,3]
=> [1, 2, 3]
irb(main):002:0> def foo(array)
irb(main):003:1> lambda { array.clear }
irb(main):004:1> end
=> nil
irb(main):005:0> fun = foo a
=> #Proc:[email protected]:3(irb)
irb(main):006:0> fun.call
=> []
irb(main):007:0> a
=> []

Yeah, I thought that lambdas supported closures, so they hold their
state
and you can pass it around.

-Corey

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