class method

ENV.length

ENV.length → an_integer

ENV.size → an_integer

static VALUE
env_size(VALUE _)
{
    return INT2FIX(env_size_with_lock());
}

Returns the count of environment variables:

Example

ENV.replace('foo' => '0', 'bar' => '1')
ENV.length # => 2
ENV.size # => 2

See also .keys .member? .key? .merge! also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0