Map with Key as String and Value as List in Groovy

Question

Can anyone point me to an example of how to use a Map in Groovy which has a String as its key and a List as value?

Answer 1

Joseph forgot to add the value in his example with withDefault. Here is the code I ended up using:

Map map = [:].withDefault { key -> return [] }
listOfObjects.each { map.get(it.myKey).add(it.myValue) }