Vocabulary
sequences

Inputs and outputs

n	an integer
seq	a sequence
elt/f	an object or f

Word description
A forgiving version of nth. If the index is out of bounds, or if the sequence is f, simply outputs f.

Definition

USING: kernel sequences.private ;

IN: sequences

: ?nth ( n seq -- elt/f )
2dup bounds-check? [ nth-unsafe ] [ 2drop f ] if ; inline