Unfortunately`js("p in this")` translates to `p in...

# javascript

[anton.bannykh]

Unfortunately`js("p in this")` translates to p in this, not to p in $receiver. Thus the temporary obj variable.

[Filipp Riabchun]

I'd say fortunately 😄

[anton.bannykh]

😅

[anton.bannykh]

There is a way to avoid the unnecessary assignment in JS code:

inline fun contains(obj: Any?, p: String): Boolean {
    return js("p in obj").unsafeCast<Boolean>()
}

inline operator fun Any?.contains(p: String) = contains(this, p)

[anton.bannykh]

println("foo" in a) => println('foo' in a);

[anton.bannykh]

But it aint so pretty