[ruby-core:65168] [ruby-trunk - Feature #10095] Object#as

Issue #10095 has been updated by Jihwan Song.


Matt,

I guess I had totally different understanding of the Ruby keyword 'yield'. When I first saw the language years back, at the statement saying 'yield' I was speaking to myself "yield what??" -- I always took it as meaning "produce" ( yeah, I always though the 'yield' was a bad choice as the keyword for it in Ruby..)

Once I understand the language, I always took it as transient verb with implied direct object, which is the block passed to it.

Actually, the examples I included runs beautifully in current definition of Ruby language. The point of my sample code is to show you that it is totally coherent with current definition of Ruby language.

Now, with the extension of current work yield, without hurting the original meaning both in English and Ruby, it now can specify subject and direct object explicitly... that's all.


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Feature #10095: Object#as
https://bugs.ruby-lang.org/issues/10095#change-49010

* Author: Akira Matsuda
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: current: 2.2.0
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We've had so many times of feature requests for a method similar to Object#tap that doesn't return self but returns the given block's execution result (e.g. #7388, #6684, #6721 ).

I'm talking about something like this in Ruby of course:
Object.class_eval { def as() yield(self) end }

IIRC Matz is not against introducing this feature but he didn't like any of the names proposed in the past, such as embed, do, identity, ergo, reference, yield_self, itself, apply, map, tap!, etc.

So, let us propose a new name, Object#as today.
It's named from the aspect of the feature that it gives the receiver a new name "as" a block local variable.
For instance, the code reads so natural and intuitive like this:

(1 + 2 + 3 + 4).as {|x| x ** 2}
=> 100

Array.new.as {|a| a << 1; a << 2}
=> [1, 2]

---Files--------------------------------
itself-block.patch (1.35 KB)


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