From: William James <w_a_x_man@...>
Date: 2009-01-12T08:24:27+09:00
Subject: Re: functional programming

Brian Candler wrote:

> # Example: convert all hash keys to strings
> src = {:one=>1, :two=>2}
> 
> # Imperative
> out = src.inject({}) { |h,(k,v)| h[k.to_s] = v; h }
> 
> # Functional
> out = src.inject({}) { |h,(k,v)| h.merge(k.to_s => v) }


src = {:one,1, :two,2}
    ==>{:one=>1, :two=>2}
Hash[ *src.map{|k,v| [k.to_s,v]}.flatten ]
    ==>{"two"=>2, "one"=>1}