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Class instance equality
websharpercompiler

In WebSharper 4.0, classes should have reference equality by default, as in standard F#. However, the code below produces "true" in my setup (VS2017(15.4) + WebSharper 4.0).

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[<JavaScript>]
module Client =
    type C() = member val m = 0 with get,set
    [<SPAEntryPoint>]
    let Main =
        let m1=C()
        let m2=C()
        let s = "Equal? " + string (m1=m2)
        text s |> Doc.RunById "main"

BTW the above is translated to

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SC$1.Main=Doc.RunById("main",Doc.TextNode("Equal? "+Global.String(Unchecked.Equals(new C.New(),new C.New()))));

Oddly, Try.WebSharper, with the same source code, produces the correct result ("false"). See http://try.websharper.com/snippet/Martin%20000/0000Gx

.

Hello,

thanks for the catch. It only happens in DCE-d code (SPA projects) because WebSharper.Obj.Equals is missing incorrectly. I have created a ticket about this: https://github.com/intellifactory/websharper/issues/832

A current workaround is to use <WebSharperDeadCodeElimination>False</WebSharperDeadCodeElimination> (Sorry, this can increase bundled JS file size quite a bit obviously...)

By on 10/16/2017 6:32 AM ()

Thanks for the fast reaction! Any idea when you can fix this? Would it be in the next release?

By on 10/16/2017 8:15 AM ()

Hi, this fix is now released in https://github.com/intellifactory/websharper/releases/tag/4.0.195.127

By on 10/18/2017 8:46 AM ()

I will fix it tomorrow, we want to bundle it for another small fix for 4.0 and then it will be released.

By on 10/16/2017 2:39 PM ()

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