From: nobu@...
Date: 2015-03-28T03:02:20+00:00
Subject: [ruby-core:68666] [Ruby trunk - Feature #11007] Prime.each.with_index should accept offset

Issue #11007 has been updated by Nobuyoshi Nakada.


`Kernel#proc` captures the block given to the caller.

~~~ruby
    def with_index(offset = 0)
      return enum_for(:with_index) unless block_given?
      # if offset == 0, use each_with_index, which is faster because of C implementation.
      return each_with_index(&proc) if offset == 0

      each do |prime|
        yield prime, offset
        offset += 1
      end
    end
~~~

and `enum = Prime.each` is needed before loop again.
It's better to split the test.

----------------------------------------
Feature #11007: Prime.each.with_index should accept offset
https://bugs.ruby-lang.org/issues/11007#change-51959

* Author: T Yamada
* Status: Open
* Priority: Normal
* Assignee: Marc-Andre Lafortune
----------------------------------------
I'd like to execute following code:

~~~
Prime.each(10).with_index(1){|e,i|
  print i,' ',e,"\n"
}
~~~

Expected output:

~~~
1 2
2 3
3 5
4 7
~~~

I have attached a patch.

---Files--------------------------------
prime.diff (1.09 KB)


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