Convert List of tuple to map (and deal with duplicate key ?)

Question

I was thinking about a nice way to convert a List of tuple with duplicate key [(\"a\",\"b\"),(\"c\",\"d\"),(\"a\",\"f\")] into map (\"a\" -> [\"b\", \"

Answer 1

For Googlers that don't expect duplicates or are fine with the default duplicate handling policy:

List("a" -> 1, "b" -> 2).toMap
// Result: Map(a -> 1, c -> 2)

As of 2.12, the default policy reads:

Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.