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Editorial Team
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Asked: 2026-06-01T22:36:25+00:00

I’m trying to sort a map in Groovy that has maps as value. I

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I’m trying to sort a map in Groovy that has maps as value. I want to iterate over the map and print out the values sorted by lastName and firstName values. So in the following example: 

def m = 
[1:[firstName:'John', lastName:'Smith', email:'john@john.com'], 
2:[firstName:'Amy',  lastName:'Madigan', email:'amy@amy.com'], 
3:[firstName:'Lucy', lastName:'B',      email:'lucy@lucy.com'], 
4:[firstName:'Ella', lastName:'B',      email:'ella@ella.com'], 
5:[firstName:'Pete', lastName:'Dog',    email:'pete@dog.com']]

the desired results would be:

[firstName:'Ella', lastName:'B',      email:'ella@ella.com']
[firstName:'Lucy', lastName:'B',      email:'lucy@lucy.com']
[firstName:'Pete', lastName:'Dog',    email:'pete@dog.com']
[firstName:'Amy',  lastName:'Madigan', email:'amy@amy.com']
[firstName:'John', lastName:'Smith', email:'john@john.com']

I’ve tried m.sort{it.value.lastName&&it.value.firstName} and m.sort{[it.value.lastName, it.value.firstName]}. Sorting by m.sort{it.value.lastName} works but does not sort by firstName.

Can anybody help with this, much appreciated, thanks!

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1 Answer

  1. Editorial Team

    This should do it:

    m.values().sort { a, b ->
  a.lastName <=> b.lastName ?: a.firstName <=> b.firstName
}
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