Issue #10208 has been updated by Shyouhei Urabe.
Status changed from Open to Feedback
FYI if there are people who need this functionality: so far we have not found an appropriately sounding name of this method. It should be a method of Enumerable (not only Hash), that takes a block, and returns a Hash.
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Feature #10208: Passing block to Enumerable#to_h
https://bugs.ruby-lang.org/issues/10208#change-61909
* Author: Yutaka HARA
* Status: Feedback
* Priority: Normal
* Assignee:
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Now that we can convert 'a list of [key, value] pairs' into a hash with Enumerable#to_h,
how about make it take a block to specify 'how to convert each element into a [key, value] pair'?
Example:
~~~
# Convert users into an {id => name} hash
users.map{|u| [u.id, u.name]}.to_h
вн
# Convert users into an {id => name} hash
users.to_h{|u| [u.id, u.name]}
~~~
This could also be a solution for these feature requests:
* Feature #6669 A method like Hash#map but returns hash
hsh.apply{|k, v| [k.to_s, v]}
== hsh.to_h{|k, v| [k.to_s, v]}
* Feature #7793 New methods on Hash
Feature #9970 Add `Hash#map_keys` and `Hash#map_values`
hsh.map_k(&:to_s)
== hsh.to_h{|k, v| [k.to_s, v]}
hsh.map_v(&:to_i)
== hsh.to_h{|k, v| [k, v.to_i]}
hsh.map_kv(&block)
== hsh.to_h(&block)
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