From: "guigs (Guilherme Schneider)" <guigs81@...>
Date: 2013-12-06T22:37:13+09:00
Subject: [ruby-core:58910] [ruby-trunk - Feature #9123] Make	Numeric#nonzero? behavior consistent with Numeric#zero?


Issue #9123 has been updated by guigs (Guilherme Schneider).


I think current implementation of Numeric#nonzero? is fine, because, as was said, a predicate is expected to return truthy or falsey values.

On the other hand, Numeric#nonzero? should only be used as a predicate. So one should not rely on it returning self if is not zero. But, because so many do use nonzero? expecting that it returns self if it is not zero (and indeed the spec say so), changing it would break compatibility.

So, what about keeping current implementation of Numeric#nonzero? and adding Numeric#nonzero (with identical implementation), but intended to be used in non predicate cases, like

a.sort {|a,b| (a.downcase <=> b.downcase).nonzero || a <=> b }

And then maybe deprecate usage of Numeric#nonzero? in non predicate cases (and changing the spec saying that nonzero? returns true if the number is not zero).
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Feature #9123: Make Numeric#nonzero? behavior consistent with Numeric#zero?
https://bugs.ruby-lang.org/issues/9123#change-43461

Author: sferik (Erik Michaels-Ober)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 


Numeric#zero? returns true or false, while Numeric#nonzero? returns self or nil.

I've written a patch that fixes this inconsistency and adds a Numeric#nonzero (non-predicate) method that returns self or nil for chaining comparisons. I'd like for this to be included in Ruby 2.1.0.

https://github.com/ruby/ruby/pull/452.patch


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