opposite-dir ( dir -- dir )

Vocabulary

snake-game.game

Inputs

dir

an object

Outputs

dir

an object

Definition

USING: assocs ;

IN: snake-game.game

: opposite-dir ( dir -- dir )
    H{
        { :up :down }
        { :down :up }
        { :right :left }
        { :left :right }
    } at ;