[ruby-core:123246] [Ruby Feature#21556] Add true? and false? methods to NilClass, TrueClass, FalseClass, and String

["nobu (Nobuyoshi Nakada) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #21556 has been updated by nobu (Nobuyoshi Nakada).


Phalado (Raphael Cordeiro) wrote in #note-6:
> The idea here came when working with JSON from requests and, especially, Active Admin. Users sometimes fill boolean values as true, other times as "true", which can be a problem if you are expecting a boolean or a string specifically. Also, a nil value can be considered 'false', which is not always the case when treating data.

It sounds like that this is an issue specific to Active Admin.
Please tell them, instead of Ruby.

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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-114579

* 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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