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typesf#keywordlanguage-comparisons

F# equivalent of `is` keyword in C#?

My first F# day. If I have this:

let cat = Animal()

Now how do I check at later stage if cat is Animal?

In C#

bool b = cat is Animal;

In F#?

Solution

  • @ildjarn deserves the credit here for answering first, but I'm submitting the answer here so it can be accepted.

    The F# equivalent of the C# is keyword is :?. For example:

    let cat = Animal()
if cat :? Animal then
    printfn "cat is an animal."
else
    printfn "cat is not an animal."