Issue #13784 has been updated by davidarnold (David Arnold).


matz (Yukihiro Matsumoto) wrote:
> Sounds OK. One concern left is `Hash#filter`.
> 
> Matz.

I have added a bug to discuss the discrepancy in Hash's behavior: https://bugs.ruby-lang.org/issues/13795

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Feature #13784: Add Enumerable#filter as an alias of Enumerable#select
https://bugs.ruby-lang.org/issues/13784#change-66407

* Author: davidarnold (David Arnold)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Ruby has a full set of functional tools in the Enumerable module under the "-ect" methods (viz. collect, select, inject).  However the usual industry terms for these are map, filter, and reduce.

For example, Swift, Python, and ECMAScript all use the names map, filter, and reduce to describe these methods.  Also, this language independent MIT course uses map, filter and reduce: http://web.mit.edu/6.005/www/fa15/classes/25-map-filter-reduce/

Ruby has aliases for map and reduce, but filter is noticeably absent.  This feature request is simply to add an alias to Enumerable for filter.  This will ease the transition of developers from other languages to Ruby.

Desired behavior:

[:foo, :bar].filter { |x| x == :foo } # => [:foo]

Current behavior:

[:foo, :bar].filter { |x| x == :foo } # NoMethodError: undefined method `filter'



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