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class method

ENV.empty?

ENV.empty? → true or false

static VALUE
env_empty_p(VALUE _)
{
    char **env;

    env = GET_ENVIRON(environ);
    if (env[0] == 0) {
        FREE_ENVIRON(environ);
        return Qtrue;
    }
    FREE_ENVIRON(environ);
    return Qfalse;
}

Returns true when there are no environment variables, false otherwise:

Example

ENV.clear
ENV.empty? # => true
ENV['foo'] = '0'
ENV.empty? # => false

See also .each_value .except .each_pair .fetch also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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