last2 ( seq -- penultimate ultimate )
Factor handbook » The language » Collections » Sequence operations » Accessing sequence elements
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Vocabulary
sequences

Inputs
seqa sequence


Outputs
penultimatean object
ultimatean object


Word description
Outputs the last two elements of a sequence.

Errors
Throws an error if the sequence has fewer than two elements.

See also
first, first2, last, but-last, but-last-slice, rest, rest-slice

Definition
USING: kernel math sequences.private ;

IN: sequences

: last2 ( seq -- penultimate ultimate )
index-of-last [ [ 1 - ] keep ] dip pick 0 <
[ nip bounds-error ] [ [ nth-unsafe ] curry bi@ ] if ;
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