first3 ( seq -- first second third ) - Factor Documentation

first3 ( seq -- first second third )
Factor handbook > The language > Collections > Sequence operations > Accessing sequence elements

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Vocabulary
sequences

Inputs and outputs

seq	a sequence
first	the first element
second	the second element
third	the third element

Word description
Pushes the first three elements of a sequence.

Errors
Throws an error if the sequence has less than three elements.

Definition

USING: kernel sequences.private ;

: first3 ( seq -- first second third )
2 swap bounds-check nip first3-unsafe ; inline