From: "shan (Shannon Skipper) via ruby-core" <ruby-core@...>
Date: 2025-09-01T00:54:12+00:00
Subject: [ruby-core:123149] [Ruby Feature#21556] Add true? and false? methods to NilClass, TrueClass, FalseClass, and String

Issue #21556 has been updated by shan (Shannon Skipper).


I wonder if the inclusion of the String variant could be reconsidered? Is there a domain where `"true"` and `"false" Strings are used? The Rails variant trying to support env vars makes more sense to me than `string == 'true'` test since you can `string == 'true'` trivially. Having `"True".true? #=> false` seems a bit counterintuitive.

For some reason the true/false/nil ones seem totally make sense to me even though I'm not sure I'd use them. I'm really curious what the use case is for the String variant?

----------------------------------------
Feature #21556: Add true? and false? methods to NilClass, TrueClass, FalseClass, and String
https://bugs.ruby-lang.org/issues/21556#change-114481

* 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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