From: usa@...
Date: 2014-03-07T19:35:46+00:00
Subject: [ruby-core:61373] [ruby-trunk - Bug #9611] [Rejected] Arithmetic operator following parentheses-less method gives ArgumentError

Issue #9611 has been updated by Usaku NAKAMURA.

Status changed from Open to Rejected

Yes, this is well-known (but often misunderstood) ruby's spec.


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Bug #9611: Arithmetic operator following parentheses-less method gives ArgumentError
https://bugs.ruby-lang.org/issues/9611#change-45684

* Author: Mat��as Battocchia
* Status: Rejected
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* Category: syntax
* Target version: 
* ruby -v: 2.0.0p195
* Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN
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It would be better to explain this with an example:

    > 'a'.length -1                                                                                                          
    ArgumentError: wrong number of arguments (1 for 0)
    from (pry):1:in `length'

Other ways of writing this expression work as expected:

    > 'a'.length() -1
    => 0

    > 'a'.length-1
    => 0

    > 'a'.length- 1
    => 0

    > 'a'.length - 1                                                                                                         
    => 0



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