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Is there any pre-defined function that I can use to compare two Maps based on the key and give me the difference? Right now, I iterate Map1 and foreach key, I check if there is an element in Map2 and I pattern match to find the difference. Is there a much elegant way to do this?
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If we want to compare hashmaps by keys i.e. two hashmaps will be equals if they have exactly same set of keys, we can use HashMap. keySet() function. It returns all the map keys in HashSet. We can compare the hashset of keys for both maps using Set.
Advertisements. map() method is a member of TraversableLike trait, it is used to run a predicate method on each elements of a collection. It returns a new collection.
Consider the difference between the maps converted into sets of tuples,
(m1.toSet diff m2.toSet).toMap
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