From: funny.falcon@...
Date: 2014-11-16T10:52:43+00:00
Subject: [ruby-core:66316] [ruby-trunk - Feature #10498] Make `loop` yield a	counter

Issue #10498 has been updated by Yura Sokolov.


~~~
> LOOP = 2**1000
 => 10715086071862673209484250490600018105614048117055336074437503883703510511249361224931983788156958581275946729175531468251871452856923140435984577574698574803934567774824230985421074605062371141877954182153046474983581941267398767559165543946077062914571196477686542167660429831652624386837205668069376 
> LOOP.times.take(10)
 => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
> LOOP.times{|i| p i; break if i == 2}
0
1
2
 => nil 
~~~

But still, if `loop` yields index it will not damage anyone.

----------------------------------------
Feature #10498: Make `loop` yield a counter
https://bugs.ruby-lang.org/issues/10498#change-49977

* Author: Franck Verrot
* Status: Open
* Priority: Normal
* Assignee: ruby-core
* Category: core
* Target version: current: 2.2.0
----------------------------------------
# Problem

Teaching Ruby, we always end up with that type of construct

```ruby
i = 0
loop do
  i += 1
  # do something with i....
  raise StopIteration if i ...
end
```

# Solution

What I propose with this patch is making `loop` yield the iteration count:

```ruby
loop do |i|
  # do something with i....
  raise StopIteration if i ...
end
```

`i` starts at 0 and stops at `FIXNUM_MAX` (there's no `Float::Infinity` equivalent for integers).

# Alternate solution

`Integer#times` could work if we had an `<Integer's infinity>` object, so we would just do `<Integer's Infinity>.times { |i| ... }`.

Also, this is the very first patch I submit to Ruby, I might have done something horrible, feel free to tell me :-)

---Files--------------------------------
0001-vm_eval.c-loop-now-yields-a-incremented-counter.patch (1.74 KB)
0001-vm_eval.c-loop-now-yields-a-incremented-counter.patch (1.86 KB)


-- 
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