C# object[,] into F#

Question

4.00/5 (1 vote)

See more:

Hi, what would be the closest equivalent F# code to a C# array of objects?

Example:

In C# I would create:

C#

object[,] tableA = new object[30,2];

C#

tableA [0, 0] = "dog";
tableA [0, 1] = 2;
tableA [1, 0] = "cat";
tableA [1, 1] = 31;

and so on ....

In F# I could create

fs

let tableA_FS = Map( [("dog", 2); ("cat", 31)] );

However I cannot cast a map into a type object[,]

what is the closest type in F# to obj[,]?

Posted 2-Jul-12 7:06am

tagad

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2012-07-02T07:23:00

Solution 1

In this particular case, you can use array2D:
http://msdn.microsoft.com/en-us/library/ee620670.aspx[^].

See also the section "Multidimensional Arrays" in the documentation page on F# arrays:
http://msdn.microsoft.com/en-us/library/dd233214.aspx[^].

—SA

Posted 2-Jul-12 7:23am

Sergey Alexandrovich Kryukov

Comments

tagad 2-Jul-12 14:31pm

Hi SA,

thanks for your reply. An array2D can be specified in 1 type. In my example I am using string and integer as types. I am not clear from the reference you pointed how to initialize an array2D in 2 different types.

thanks

Sergey Alexandrovich Kryukov 2-Jul-12 15:47pm

No, you are not using different types! You use one polymorphic type System.Object. It has nothing to do with the array rank, could be in single-dimensional array in exact same way. You can do exactly the same thing in F#.
--SA

tagad · Answer 2 · 2012-07-02T23:58:00

Solution 2

A possible way to do it is

F#

let myArray2D : obj[,] = Array2D.create 2 2 (box())
myArray2D.[0,0] <- box("cc")
myArray2D.[0,1] <- box(2.0)
...

this has type obj[,]

Posted 2-Jul-12 23:58pm

tagad