From: Michael Neumann <neumann@...>
Date: 2001-10-11T19:31:46+09:00
Subject: [ruby-talk:22427] Re: list comprehensions alike Python ???

Robert Feldt wrote:
> On Thu, 11 Oct 2001, Paul Prescod wrote:
> 
> > Out of curiousity, what would the Ruby for this look like:
> > 
> > >>> arr = [x*x for x in range(0,10) if x%2==0]
> > >>> arr
> > [0, 4, 16, 36, 64]
> > 
> > A combination of filter and map?
> > 
> One alternative is:
> irb(main):001:0> (0...10).select{|v| v%2==0}.map{|v| v*v}
> [0, 4, 16, 36, 64]

Shorter (but with external array):

  irb(main):001:0> a=[]; 0.step(10,2) {|i| a<<i*i}; a


-- 
Michael Neumann
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