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Intersperse an array

Imperative and fast implementation of an intersperse function for array. if you search for a functional implemenation you should look [here](http://www.fssnip.net/7S3/title/Intersperse-a-list).

Implementation

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module Array =
    /// <summary>
    /// The intersperse function takes an element and an array and
    /// 'intersperses' that element between the elements of the array.
    /// </summary>
    /// <exception cref="System.ArgumentNullException"/>
    let intersperse sep (array: 'a array) =
        if isNull array then nullArg "arr"
        elif array.Length = 0 then [||]
        else
            let interspersedArray = Array.zeroCreate ((array.Length * 2) - 1)
            for i = 0 to array.Length - 1 do
                let j = i * 2
                interspersedArray.[j] <- array.[i]
                if (j < interspersedArray.Length - 1) then
                    interspersedArray.[j + 1] <- sep
            interspersedArray

Example

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Array.intersperse 0 [|1..10|]

// throws a null arg exception, like any other Array module func
Array.intersperse 0 null

module Array

from Microsoft.FSharp.Collections

val intersperse : sep:'a -> array:'a array -> 'a []

Full name: Script.Array.intersperse

<summary>
The intersperse function takes an element and an array and
'intersperses' that element between the elements of the array.
</summary>
<exception cref="System.ArgumentNullException"/>

val sep : 'a

Multiple items
val array : 'a array

--------------------
type 'T array = 'T []

Full name: Microsoft.FSharp.Core.array<_>

val isNull : value:'T -> bool (requires 'T : null)

Full name: Microsoft.FSharp.Core.Operators.isNull

val nullArg : argumentName:string -> 'T

Full name: Microsoft.FSharp.Core.Operators.nullArg

property System.Array.Length: int

val interspersedArray : 'a []

val zeroCreate : count:int -> 'T []

Full name: Microsoft.FSharp.Collections.Array.zeroCreate

val i : int

val j : int

Multiple items
module Array

from Script

--------------------
module Array

from Microsoft.FSharp.Collections

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More information

Link:	http://fssnip.net/7S4
Posted:	7 years ago
Author:	Tobias Burger
Tags:	array , intersperse