Feature #21857: Introduce to_proc pattern

• Status: Assigned
• Assignee: ktsj (Kazuki Tsujimoto)
• Target version: -

[sanfrecce-osaka (Masatoshi Moritsuka)]

When object has some logics, we can use &object syntax with Enumerable or Array, etc.

users.any?(&:admin?)

There are some times when I want to write pattern matching similar to the syntax, but currently we either have to write proc or combine pin operator with to_proc, which is a bit verbose.

users in [*, ^(:admin?.to_proc), *]
users in [*, -> (user) { user.admin? }, *]

Therefore, I propose introducing a new pattern into pattern matching.
The pattern matches an object such that pattern.to_proc === object.
This allows us to write code with a familiarity close to the syntax we're accustomed to.

users in [*, &:admin?, *]

[matheusrich (Matheus Richard)]

Could you add why one would prefer writing users in [*, &:admin?, *] over users.any?(&:admin?)?

[mame (Yusuke Endoh)]

• Status changed from Open to Assigned
• Assignee set to ktsj (Kazuki Tsujimoto)