either? ( object -- ? )

Vocabulary

monads

Inputs and outputs

object	an object
?	a boolean

Word description

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

Definition

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

IN: monads

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