head? ( seq begin -- ? )
Factor handbook > The language > Collections > Sequence operations > Testing sequences

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Vocabulary
sequences

Inputs and outputs
seqa sequence
begina sequence
?a boolean


Word description
Tests if seq starts with begin. If begin is longer than seq, this word outputs f.

Examples
USING: prettyprint sequences ; { "accept" "adept" "advance" "advice" "affect" } [ "ad" head? ] filter .
{ "adept" "advance" "advice" }


Definition