?nth ( n seq -- elt/f )
Factor handbook » The language » Collections » Sequence operations » Accessing sequence elements

Next:

first ( seq -- first )

Vocabulary
sequences

Inputs

n	an integer
seq	a sequence

Outputs

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.

See also
nth

Definition

USING: kernel sequences.private ;

IN: sequences

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