Testing sequences
Factor handbook > The language > Collections > Sequence operations

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Testing for an empty sequence:
empty? ( seq -- ? )


Testing indices:
bounds-check? ( n seq -- ? )


Testing if a sequence contains an object:
member? ( elt seq -- ? )

member-eq? ( elt seq -- ? )


Testing if a sequence contains a subsequence:
head? ( seq begin -- ? )

tail? ( seq end -- ? )

subseq? ( subseq seq -- ? )