Question

Consider the following code fragment in VS2010 Beta 1:

let array = Array2D.zeroCreate 1000 500

This produces an error, namely:

 error FS0030: Value restriction. The value 'array' has been inferred to have 
generic type val array : '_a [,]
Either define 'array' as a simple data term, make it a function with explicit 
arguments or, if you do not intend for it to be generic, add a type annotation.

Can I explicitly set the type (in my case a grid of string)?

Answer 1

You can explicitly specify the type like this:

let array : string [,] = Array2D.zeroCreate 1000 500

For further information on the value restriction you might want to take a look at this F#-Wiki page.