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Comment by snek | Hacker News Reader

In JS, the pattern is the type. That is the point of duck typing.

> In JS, the pattern is the type.

How do you match against a `Buffer` pattern/type?

In the current proposal,

    case (value) {
        when { constructor: Buffer } ->
            console.log("It's a Buffer!")
    }

that doesn't handle subtying though and doesn't work across realms.

Oh interesting you can match on that!

However I think my point stands that javascript has runtime conceptions of types that go beyond duck typing.