Opposite of 'is' in if statement?

Question

I want to see if this statement is false:

if twData is Array {
}

isnt and isnot don't seem to exist.

This doesn't work:

if (twData is Array) == false {
}

So I'm not sure exactly how to do this, other than the less clean:

if twData is Array {
} else {
//Code goes here
}

Answer 1

If you know the generic type stored in the array, then you should make it explicit:

if !(twData is Array<Int>) {
    // Do something
}

If instead you just want to know if it's an array regardless of the generic type, then you have to use NSArray:

if !(twData is NSArray) {
}