From: Brian Candler <b.candler@...>
Date: 2010-06-21T21:11:20+09:00
Subject: Re: Ruby Basic

Jes炭s Gabriel y Gal叩n wrote:
>> Solution:
>>
>> eval("one")
> 
> I'd rather use send:
> 
> irb(main):001:0> def one
> irb(main):002:1> "hi"
> irb(main):003:1> end
> => nil
> irb(main):004:0> list = %w{one}
> => ["one"]
> irb(main):005:0> send(list.first)
> => "hi"

There are some other options too.

(1) a (bound) Method object, which includes both the receiver and the 
method.

class Person
  def initialize(name)
    @name = name
  end
  def greet
    puts "hi I'm #{@name}"
  end
end

fred = Person.new("Fred")
m = fred.method(:greet)

m.call

# compare Jes炭s' suggestion: fred.send(:greet)

(2) use a lambda instead of a method

m = lambda { puts "Hello" }
m.call

# This also has access to surrounding local variables (closure)

c = 0
m = lambda { c += 1; puts "Call number #{c}" }
m.call
m.call
m.call
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