tetromino? ( object -- ? )

Vocabulary

tetris.tetromino

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the tetromino class.

Definition

USING: classes.tuple.private kernel slots.private ;

IN: tetris.tetromino

: tetromino? ( object -- ? )
    dup tuple?
    [ layout-of 7 slot \ tetromino eq? ] [ drop f ] if ;