boolean_casting.md

✅ Double Bang for Strict Boolean Casting

The double bang operator (!!) converts any object to its boolean equivalent (true or false). It’s handy in conditional contexts or when you need explicit boolean values instead of truthy/falsy objects.

def feature_enabled?(config)
  !!config[:enable_feature]
end

p feature_enabled?(enable_feature: "yes") # => true
p feature_enabled?(enable_feature: nil)   # => false