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Feature #15573

Permit zero step in Numeric#step and Range#step

Added by mrkn (Kenta Murata) over 1 year ago. Updated over 1 year ago.

Status:
Open
Priority:
Normal
Target version:
-
[ruby-core:91324]

Description

Numeric#step disallows zero in the 2nd argument, but it allows zero passed as the value of by: keyword argument. I confirmed that this inconsistency exists since 2.3. I want to allow zero in the 2nd argument, too.

>> 1.step(10, by: 0) { break }
=> nil
>> 1.step(10, 0) { break }
Traceback (most recent call last):
        5: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `<main>'
        4: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `load'
        3: from /Users/mrkn/.rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        2: from (irb):5
        1: from (irb):5:in `step'
ArgumentError (step can't be 0)

Moreover, Range#step disallows zero if a block is given. I want to relax also this restriction.

>> (1..10).step(0) { break }
Traceback (most recent call last):
        6: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `<main>'
        5: from /Users/mrkn/.rbenv/versions/2.6.0/bin/irb:23:in `load'
        4: from /Users/mrkn/.rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        3: from (irb):6
        2: from (irb):6:in `rescue in irb_binding'
        1: from (irb):6:in `step'
ArgumentError (step can't be 0)

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