subseq-index ( seq subseq -- i/f )
Factor handbook » The language » Collections » Sequence operations » Searching sequences

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Vocabulary
sequences

Inputs

seq	a sequence
subseq	a sequence

Outputs

i/f	a start index or f

Word description
Outputs the start index of the first contiguous subsequence equal to subseq. If no matching subsequence is found, outputs f.

Definition

USING: kernel ;

IN: sequences

: subseq-index ( seq subseq -- i/f )
    [ 0 ] 2dip subseq-index-from ; inline