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map of maps in groovy

 
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I would like to create a map of maps in groovy.
For each entry in idToStates, I would have
[id : [state:timestamp]]

The problem with the code below is that the [state:timestamp] is not adding new state-to-timestamp pairs, but merely replacing the existing one.

I do not seem to be able to find a solution, I might not be using the correct groovy syntax since I am new to it. Thank you in advance for your help.



 
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Well, I haven't seen the "<<" operator except for moving bits, but you can use the .put() method:

 
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