From: "alexeymuranov (Alexey Muranov)" <redmine@...>
Date: 2013-02-28T05:11:00+09:00
Subject: [ruby-core:53008] [ruby-trunk - Feature #7978] boolean to_i


Issue #7978 has been updated by alexeymuranov (Alexey Muranov).


matz (Yukihiro Matsumoto) wrote:
> Ruby is not C. 0 is not false. false is not 0.

In some respects they are similar, and 0 and 1 are often used in relation to logical operation.  For example, the characteristic function of a set P is defined as

��_P(x) = 1 if x���P is true
��_P(x) = 0 if x���P is false

The simplest boolean algebra consists of 0 and 1 with the usual algebraic operations mod 2.

----------------------------------------
Feature #7978: boolean to_i
https://bugs.ruby-lang.org/issues/7978#change-37163

Author: alexeymuranov (Alexey Muranov)
Status: Rejected
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: next minor


=begin
The current behavior is the following:

  > nil.to_i
   => 0 
  > false.to_i
  NoMethodError: undefined method `to_i' for false:FalseClass

  > true.to_i
  NoMethodError: undefined method `to_i' for true:TrueClass

This does not look very consistent to me.  I think it could be useful to define (({false.to_i})) as 0 and (({true.to_i})) as 1.  I think those are fairly common numeric values for False and True.  These values as strings "0" and "1" are also commonly used in HTML forms to represent boolean values.
=end



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