Feature #8453: Implement Struct.map

• Status: Closed
• Assignee: -
• Target version: -

[eLobato (Daniel Lobato Garcia)]

http://ruby-doc.org/core-2.0/Struct.html does not contain any 'map' like method, I imagine given 'each' and 'select' are available it's probably not too hard to implement.

As always I'm 100% open to contribute so if you deem this necessary just let me know and I'll start writing a patch.

[Eregon (Benoit Daloze)]

• Status changed from Open to Closed

Struct instances (that is classes produced by Struct.new) include Enumerable.

Actually Struct itself includes Enumerable (written in the left column on the documentation page)
and Struct.new makes Struct an ancestor of the created class.

Struct.new(:a,:b).new(1,2).map { |i| i*2 } #=> [2, 4]

I wonder why #select is overridden though. Probably performance reasons.

[Eregon (Benoit Daloze)]

Eregon (Benoit Daloze) wrote:

I wonder why #select is overridden though. Probably performance reasons.

Actually, it is an historical reason: #select used to have #values_at behavior when given integers.