[ruby-core:63275] [ruby-trunk - Feature #8499] Importing Hash#slice, Hash#slice!, Hash#except, and Hash#except! from ActiveSupport

[nobu@ruby-lang.org]

Issue #8499 has been updated by Nobuyoshi Nakada.

Description updated

Another name, `Hash#only`.
http://blog.s21g.com/articles/228

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Feature #8499: Importing Hash#slice, Hash#slice!, Hash#except, and Hash#except! from ActiveSupport
https://bugs.ruby-lang.org/issues/8499#change-47322

* Author: Kenta Murata
* Status: Assigned
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Category: core
* Target version: current: 2.2.0
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According to my experiences, the following two idioms often appeare in application codes.

1. `hash = other_hash.select { |k, | [:key1, :key2, :key3].include? k }`
2. `hash = other_hash.reject { |k, | [:key1, :key2, :key3].include? k }`

On Rails, they can be written in the following forms by using ActiveSupport's features.

1. `hash = other_hash.slice(:key1, :key2, :key3)`
2. `hash = other_hash.except(:key1, :key2, :key3)`

I think the latter forms are shorter and more readable than the former ones.

So I propose to import the following methods from ActiveSupport:

* `Hash#slice`
* `Hash#slice!`
* `Hash#except`
* `Hash#except!`


---Files--------------------------------
patch.diff (4.05 KB)
patch2.diff (4.07 KB)


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