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kotlinlang

Is there standard Kotlin analog of Guava `Sets.difference`?
In Kotlin it will be:
```
fun Set&lt;T&gt;.difference(other: Set&lt;T&gt;): Set&lt;T&gt;
{
  return subtrack(other) + other.subtrack(this)
}
```

looking at the docs for that `Sets.difference()` method, it doesn’t seem like it works like your code snippet:

&gt;&gt;&gt;
The returned set contains all elements that are contained by set1 and not contained by set2. set2 may also contain elements not present in set1; these are simply ignored.

`Set.subtract()` seems to already fulfill this requirement

the difference extension method you wrote looks more like a `symmetricDifference` method, which I don’t believe Kotlin provides

Guava does have a method that takes care of that, however