null? ( set -- ? )
Factor handbook » The language » Collections » Sets » Operations on sets

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Vocabulary
sets

Inputs

set

a set

Outputs

?

a boolean

Word description
Tests whether the given set is empty. This outputs t when given a null set of any type.

Definition

IN: sets

GENERIC: null? ( set -- ? )

Methods

USING: sequences sets ;

M: sequence null? empty? ; inline


USING: kernel sets ;

M: set null? cardinality 0 = ; inline