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Locate the tuple in the array of tuples
f#

Hello:

let tuple1 = (1.0M, 10L)
let array3Tuple = [| (1.0M, 10L); (2.0M, 20L); (3.0M, 30L) |]

I need a function to check if array3Tuple contains tuple1, if not, then add the tuple1 to the last tuple in the array,
and remove the first tuple in the array.
I.e:
let tuple2 = (4.0M, 40L)
let array3Tuple = [| (1.0M, 10L); (2.0M, 20L); (3.0M, 30L) |]
The result is:
let arrayFinal = [| (2.0M, 20L); (3.0M, 30L); (4.0M, 40L) |]
Please show me your code!
Merry Christmas and Happy New Year!

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>
let f (item : 'T) (arr : 'T[]) =
    if Array.exists (fun x -> x = item) arr then
        arr
    else
        Array.init (arr.Length) (fun i -> if i < arr.Length-1 then arr.[i+1] else item);;
By on 12/23/2010 4:44 AM ()

Hi, Joh:
Thank you very much, your code works!
Merry Christmas and Happy New Year to you!

By on 12/23/2010 9:58 AM ()

As a hint, look at Array.exists and Array.append and remember that arrays are immutable.
If you're continually adding to this array piecemeal, consider using a ResizeArray or List<T>.

By on 12/22/2010 2:43 PM ()

Hi,
Thanks for your hint. But I am not smart enough to figure it out.
If you have a good idea, can you show me your code?
Thank you very much for your help.

By on 12/22/2010 10:47 PM ()

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