REBOL Document

Intersect - Function Summary


Create a new value that is the intersection of the two arguments.


intersect ser1 ser2


ser1 - first set (must be: series bitset)

ser2 - second set (must be: series bitset)


/case - Uses case-sensitive comparison.

/skip - Treat the series as records of fixed size

size - The size argument. (must be: integer)


Returns all elements within two blocks or series that exist in both.

    lunch: [ham cheese bread carrot]
    dinner: [ham salad carrot rice]
    probe intersect lunch dinner
    [ham carrot]

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

    string1: "CBAD"    ; A B C D scrambled
    string2: "EDCF"    ; C D E F scrambled
    probe intersect string1 string2

    items: [1 1 2 3 2 4 5 1 2]
    probe intersect items items  ; get unique set
    [1 2 3 4 5]

    str: "abcacbaabcca"
    probe intersect str str

To obtain a unique set (to remove duplicate values) you can use UNIQUE.

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


difference - Return the difference of two data sets.
union - Creates a new set that is the union of the two arguments.

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