Question

我怎么能够把一大批ool子带给F#的功能?

Thanks Maybettle

Answer 1

有两个选择,取决于您是否重新使用实际的2D阵列(硬体阵列)或阵列(其组成部分是阵列的阵列,其长度可能有所不同):

如果你不相信哪一个可以使用的话,那么,知道标记阵列较快,但与直径阵列合作可能比较容易(因为你可以肯定各个层面)。

let foo (ar:bool[,]) = ar.[0, 0]   // Get element at specified coordinates
let bar (ar:bool[][]) = ar.[0].[0] // Get first array and then the element

To call the two functions, you can use the following syntax:

// Create array of arrays and call the function
bar [| [| true |] |]

// Creates array of arrays and converts it to multi-dimensional array
// You can also use plenty of functions from  Array2D  module
foo (array2D [| [| true |] |])

If you want to write function that will be more general, you can also use sequence of sequences. This will be compatible with jagged arrays only, but you can also use the function with e.g. F# lists of lists or any .NET collection types.

let woo (ar:seq<#seq<bool>>) = Seq.head (Seq.head ar)

The #seq<.> 类型是指它可以是顺序还是任何其他衍生类型。由于F#自动投出外型(但并非部件),因此该元素类型需要这种处理,但不适用于外型。

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