Inplace array update

[Kuba Roth]

Could anybody help me out understanding why below example does not work on the array please?

let a = [|1;2;3|];;
Array.iter (fun x -> x <- 2) a;;
Error: The value x is not an instance variable

Thanks,
kuba

[Jon Harrop]

The function you passed to Array.iter is given the value of the element in the array rather than a reference to it. Consequently, it is immutable.

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[David House]

To modify elements of an array you want something like:

a.(0) <- 2

[juuso....@gmail.com]

Array.iteri will provide you with the current index, which you can use to update the array using the syntax David mentioned