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kotlinlang

Untitled.kt

Is there an idiomatic way to diff between two lists, based on some value? I tried to use the minus opertaor and it gave the first one as the diff too. Do not want that

list1.filter { a -&gt; !list2.contains(a)  } ?

Need to do reverse also and combine. Might be easier way though :thinking_face:

Found this on SO, seems to work well.
```
 val sum = ogList + newList
	val ans =  sum.groupBy { it.id }
    				.filter { it.value.size == 1 }
    				.flatMap { it.value }
```

If data is large may want to use sequence