ruby-core

Issue #15093 has been updated by shevegen (Robert A. Heiler).


I can not say much about the reasoning (I am neutral there) but
I agree in one regards - if we use a large number, we get all
Array members:


    a = [1,2,3,4] # => [1, 2, 3, 4]
    a[0..111111111] # => [1, 2, 3, 4]

So from this point of view, in this context, infinity could also
mean a very large number, in which case the operation should 
or could be treated like any other high number.

But I think matz has to have a look at this since it correlates
with the topic of infinity (and to some extent "ranges"; not so
much in this example alone necessarily, but I think infinity has
to do with ranges as well).

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Feature #15093: Retrive Array elements with infinite ranges specified by Float::INFINITY
https://bugs.ruby-lang.org/issues/15093#change-73955

* Author: v0dro (Sameer Deshmukh)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Currently in Ruby head (2.6) the following gives an error:
~~~ ruby
2.6-head :001 > a = [1,2,3,4]
# => [1, 2, 3, 4] 
2.6-head :002 > a[0..Float::INFINITY]
#Traceback (most recent call last):
#        2: from /home/sameer/.rvm/rubies/ruby-2.6-head/bin/irb:11:in `<main>'
#        1: from (irb):2
#RangeError (float Inf out of range of integer)
~~~

I think `Array` should support infinite ranges created by `Float::INFINITY` as well
since `0..nil` and `0..Float::INFINITY` are both supposed to create 'infinite' ranges
and having different behavior for each of them is inconsistent. 



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