nil

Returns

nil

Description

The special value, nil, is a zero-length list. It is the only logically false value in Gamma. All other Gamma values are considered to be logically true. A common mistake for first-time Gamma programmers is to treat the number zero as logically false.

Example

    Gamma> x = 5;
    5
    Gamma> x > 10;
    nil
    Gamma> int_p(x);
    t
    Gamma> real_p(x);
    nil
    Gamma> !3;
    nil
    Gamma> !t;
    nil
    Gamma>