REBOL 3 Functions: unique

unique set1 /case /skip size

Returns the data set with duplicates removed.

Arguments:

set1 [block! string! binary! bitset! typeset!]

Refinements:

/case - Use case-sensitive comparison (except bitsets)

/skip - Treat the series as records of fixed size

size [integer!]

Description

Removes all duplicate values from a set or series:

lunch: [ham cheese bread carrot ham ham carrot]
probe unique lunch
[ham cheese bread carrot]

probe unique [1 3 2 4 3 5 4 6]
[1 3 2 4 5 6]

string: "CBADEDCF"
probe unique string
"CBADEF"

Note that performing this function over very large data sets can be CPU intensive.