ENV.invert

ENV.invert → hash of value/name pairs

static VALUE
env_invert(VALUE _)
{
    return rb_hash_invert(env_to_hash());
}

Returns a Hash whose keys are the ENV values, and whose values are the corresponding ENV names:

Example

ENV.replace('foo' => '0', 'bar' => '1')
ENV.invert # => {"1"=>"bar", "0"=>"foo"}

For a duplicate ENV value, overwrites the hash entry:

Example

ENV.replace('foo' => '0', 'bar' => '0')
ENV.invert # => {"0"=>"foo"}

Note that the order of the ENV processing is OS-dependent, which means that the order of overwriting is also OS-dependent. See About Ordering.

See also .inspect .keep_if .include? .key also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0