Feature #13172: Method that yields object to block and returns result

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

[Nondv (Dmitry Non)]

Hi everyone!

There's a #tap method, that yields reciever to block and returns reciever itself.
I would like to see method, which would return yield's result.

some_object.some_method.pass { |x| x && another_object.another_method(x) }

I've seen many code samples that had a some "middle-variables" to store #some_method result.
Those variables are useless after few lines of code, so it would be great to create them in a limited scope (block).

P.S. I am very sorry for my english. I hope you understood me:D
P.P.S. I think there should be a better name than pass for such method

UPD. I've created a PR to see if #pass fits: https://github.com/ruby/ruby/pull/1521

$ irb
>> Time.now.pass { |t| t.sunday? ? 'Yay!' : ':(' }
==> ":("

[Nondv (Dmitry Non)]

• Description updated (diff)

[Nondv (Dmitry Non)]

• Subject changed from Object#pass (yield object to block and return result) to Method that yields object to block and returns result

[Nondv (Dmitry Non)]

Oh, I forgot to notice. There's #instance_eval method, which do the job, but it evaluates block in object context, so it doesn't fit

[Nondv (Dmitry Non)]

• Tracker changed from Bug to Feature

[phluid61 (Matthew Kerwin)]

• #6721
• #6684
• #7388
• #10095
• #11717
• #12760

[Nondv (Dmitry Non)]

Matthew Kerwin wrote:

• #6721
• #6684
• #7388
• #10095
• #11717
• #12760

Well, obviously I can't use searching:D
So, what about naming?

#12760 suggests yield_self name, but imho it's too long.

Check https://github.com/ruby/ruby/pull/1521 pls.

[nobu (Nobuyoshi Nakada)]

• Is duplicate of Feature #10095: Object#as added

[nobu (Nobuyoshi Nakada)]

• Is duplicate of Feature #11717: Object#trap -- pass object to block and return result added

[nobu (Nobuyoshi Nakada)]

• Is duplicate of Feature #12760: Optional block argument for `itself` added

[Nondv (Dmitry Non)]

• Description updated (diff)

[Nondv (Dmitry Non)]

• Description updated (diff)

[Nondv (Dmitry Non)]

• Description updated (diff)

[Nondv (Dmitry Non)]

• Description updated (diff)

[Nondv (Dmitry Non)]

• File method_pass.patch method_pass.patch added

.patch file

[matz (Yukihiro Matsumoto)]

I don't think "pass" is a good name for it.

Matz.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r58528.

---

object.c: Kernel#yield_self

• object.c (rb_obj_yield_self): new method which yields the
  receiver and returns the result.
  [ruby-core:46320] [Feature #6721]