Defines Enumerable#hashify, which creates a hash with the enumerable's items as keys and with a given constant value or with block-computed values:

[1,2,3,4].hashify                --> {1=>true, 2=>true, 3=>true, 4=>true}
[1,2,3,4].hashify("a")           --> {1=>"a", 2=>"a", 3=>"a", 4=>"a"}
[1,2,3,4].hashify{|n| "a" * n}   --> {1=>"a", 2=>"aa", 3=>"aaa", 4=>"aaaa"}

gem install enumerable_hashify

or in your Gemfile

gem "enumerable_hashify"

Enumerable#hashify is now also available in the facets gem.

MRI 1.8.7, MRI 1.9.3, MRI 2.0.0

I've been using this in my projects for years with the name Enumerable#to_h, and figured it was time to make a gem since nobody else seems to have.

But there's been a bunch of discussion online as to what the proper semantics that Enumerable#to_h should have, without universal agreement. I recently found a proposal from back in 2001 that suggested this same functionality with the name Enumerable#hashify which seemed pretty good to me. I don't know why that proposal wasn't adopted as part of ruby. But here it is as a gem.

Released under the MIT License. See LICENSE for details.