From: David Vallner <david@...>
Date: 2006-10-29T22:12:54+09:00
Subject: Re: Define a hash using %q?

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Robert Klemme wrote:
> Logan Capaldo wrote:
>> Alternative decandence:
>>
>> class Array
>>   def to_hsh
>>     require 'enumerator'
>>     to_enum(:each_slice, 2).to_a.inject({}) { |h, (k, v)|
>> h.update(k=3D>v) }
>>   end
>> end
>=20
> This seems a bit inefficient.  If you write a method then I'd prefer
>=20
> require 'enumerator'
> module Enumerable
>   def to_hash
>     h =3D {}
>     to_enum(:each_slice, 2).each {|k,v| h[k]=3Dv}
>     h
>   end
> end
>=20
> irb(main):021:0> %w( a b c d ).to_hash
> =3D> {"a"=3D>"b", "c"=3D>"d"}
> irb(main):022:0> (1..10).to_hash
> =3D> {5=3D>6, 1=3D>2, 7=3D>8, 3=3D>4, 9=3D>10}
>=20

Well, if Ruby had clean blocks, the method using #inject might be more
efficient - I don't know how expensive the implicit hash construction
for method parameters is. Smalltalk muscle memory working there?

David Vallner


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