From: "Eustáquio Rangel" <eustaquiorangel@...>
Date: 2009-01-08T20:46:28+09:00
Subject: Re: Can you guess what it will be happened?

Hi!

2009/1/8 Jun Young Kim <jykim@altibase.com>:
> what's the definition of '*'?
> is this pointer?

It's called "splat operator". You can use it to "explode" your array
elements or join some variables on an array. Note the difference:

irb(main):001:0> a = [1,2]; b = [3,4]
=> [3, 4]
irb(main):002:0> a.push(b)
=> [1, 2, [3, 4]]
irb(main):003:0> a.push(*b)
=> [1, 2, [3, 4], 3, 4]

And now:

irb(main):004:0> def test(*args)
irb(main):005:1>   p args
irb(main):006:1>   end
=> nil
irb(main):007:0> test(1)
[1]
=> nil
irb(main):008:0> test(1,2,3)
[1, 2, 3]

Regards,