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Comment by lultimouomo | Hacker News Reader

I like D solution very much: http://dlang.org/phobos/std_typecons.html#.Flag which results in calls like:

    document.addObserver(observer, "load", Yes.isWeak);

    xhr.OpenUrl(url, options, No.sync)

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Wow that looks really good. Can you use any String after the dot?

P.S. I don't use D

Yes, you declare the parameter as

    Flag!"async"

And then the possible values are Yes.async and No.async This exploits D dispatch operator: http://dlang.org/operatoroverloading.html#dispatch which in general is great for implementing this sort of dynamic feature in a strongly statically typed language as D - everything is checked as compile time!

You could look at the linked documentation. I think it makes it clear.

PS: I don't use D.

I see the lazy people are out in force :)

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