From: nobu@...
Date: 2015-07-30T01:39:59+00:00
Subject: [ruby-core:70179] [Ruby trunk - Bug #11406] Inconsistent behavior when creating a range of strings which end in an integer greater than 10

Issue #11406 has been updated by Nobuyoshi Nakada.

Description updated

It's not inconsistent, but derived from the behavior of `String#succ`.

~~~ruby
p "foo9".succ #=> "fop0"
~~~

And it ended with "zzzz9", or exceeds the length of "foo10".

I agree that the current behavior is less convenient in such cases.


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Bug #11406: Inconsistent behavior when creating a range of strings which end in an integer greater than 10
https://bugs.ruby-lang.org/issues/11406#change-53605

* Author: Michael Martinez
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.2.2
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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# Steps to Reproduce

In Ruby v2.2.2

1. Create a range of strings using 'foo1' up to 'foo9':

    ~~~ruby
    ('foo1'..'foo9').to_a
    => ["foo1", "foo2", "foo3", "foo4", "foo5", "foo6", "foo7", "foo8", "foo9"]
    ~~~

    Observe the results are as we expect

2. Create a range of strings using 'foo1' up to 'foo10'

    ~~~ruby
    ('foo1'..'foo10').to_a
    => ["foo1", "foo2","foo3","foo4","foo5", "foo6", "foo7", "foo8", "foo9", "fop0","fop1", "fop2", "fop3", "fop4", "fop5", "fop6", "fop7", "fop8", "fop9", "foq0", ....]
    ~~~
    Also:

    ~~~ruby
    ('foo1'..'foo10').to_a.size
    => 4707939
    ~~~

    Observe that the output loops `1..9` about 523104 times (arbitrarily?)

# Expected Results

The output in step 1 makes me expect for Ruby's range class to intelligently create ranges using a strings that include integers inside them. However this only seems to work for `1..9` ranges.

# Actual Results
Inconsistent behavior for range creation.


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Screen Shot 2015-07-29 at 5.40.16 PM.png (54.4 KB)


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