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Returns the index number of the current position in the series.
series [series! gob! port!]
/xy - Returns index as an XY pair offset
The index function returns the position within a series. For example, the first value in a series is an index of one, the second is an index of two, etc.
str: "with all things considered" print index? str 1
print index? find str "things" 10
blk: [264 "Rebol Dr." "Calpella" CA 95418] print index? find blk 95418 5
Use the OFFSET? function when you need the index difference between two positions in a series.
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