From: Rodrigo Rosenfeld Rosas <rr.rosas@...>
Date: 2011-05-25T22:44:30+09:00
Subject: [ruby-core:36460] [Ruby 1.9 - Feature #4772] Hash#add_keys


Issue #4772 has been updated by Rodrigo Rosenfeld Rosas.


> In recent version, if I want to do the same thing, the code may be:
> 
> hash = Hash.new {|h,k| k + k.succ}
> ["a","b","c"].each do |key|
>   hash[key] = hash[key] # this kind of assignment is somewhat odd
> end

Actually, as already noticed here, this could be just:

['a', 'b', 'c'].each {|k| hash[k]} # You don't need to assign to it.

But I like your suggestion anyway...
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Feature #4772: Hash#add_keys
http://redmine.ruby-lang.org/issues/4772

Author: Joey Zhou
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Hi, do you want to add a new method Hash#add_keys in a new version?

hash = Hash.new {|h,k| k.to_s + "foo" }
hash.add_keys("a","b","c") # the value is hash's default obj or proc value

If there's a word list file, I want to make the words keys of a hash, maybe I can write:

hash = {}
hash.add_keys(*open("file").readlines.map(&:chomp))




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