ENV.index(value) â key Class Public methods Deprecated method that is equivalent

ENV.key?(name) â true or false Class Public methods Returns true

ENV.select! { |name, value| } â ENV or nilENV.select! â Enumerator Class Public methods

ENV.to_s â "ENV" Class Public methods Returns âENVâ

ENV.size Class Public methods Returns the number of environment variables.

ENV.replace(hash) â env Class Public methods Replaces the contents of the environment

ENV.has_value?(value) â true or false Class Public methods Returns true

ENV.shift â Array or nil Class Public methods Removes an environment variable

ENV.store(name, value) â value Class Public methods Sets the environment variable

ENV.reject! { |name, value| } â ENV or nilENV.reject! â Enumerator Class Public methods