[ruby-core:123139] [Ruby Feature#21556] Add true? and false? methods to NilClass, TrueClass, FalseClass, and String

["Phalado (Raphael Cordeiro) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #21556 has been updated by Phalado (Raphael Cordeiro).


nobu (Nobuyoshi Nakada) wrote in #note-1:
> Phalado (Raphael Cordeiro) wrote:
> > Sometimes we need to check for an exact `true` or `false` value. This can be a string or a boolean value.
> 
> For what situation, and why mixing strings and `true`/`false`?
> It sounds like depending on applications/libraries.

Data received on requests and JSON conversion. It's not unusual that a Boolean is converted to a String, or users end up filling in as a String instead of a Boolean.

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Feature #21556: Add true? and false? methods to NilClass, TrueClass, FalseClass, and String
https://bugs.ruby-lang.org/issues/21556#change-114473

* Author: Phalado (Raphael Cordeiro)
* Status: Feedback
----------------------------------------
Sometimes we need to check for an exact `true` or `false` value. This can be a string or a boolean value.

Usually, what I do to solve this is something like `value.to_s == true`, this way covering for strings, booleans, and nil values.

The idea of these new methods is to check for the exact value, being it a String, a Boolean, or even a Nil value.

This is the result obtained:

``` ruby
# String

'true'.true? # true
'false'.true? # false
''.true? # false

'true'.false? # false
'false'.false? # true
''.false? # false

# Boolean

true.true? # true
true.false? # false

false.true? # false
false.false? # true

# Nil

nil.true? # false
nil.false? # false
```




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