An example for extracting values from a list of Maps

ExtractValuesFromAHashMap.groovy

#!/usr/bin/env groovy

def m = [
    nephew1:[name:"Huey", age:10],
    nephew2:[name:"Dewey", age:12],
    nephew3:[name:"Louie", age:13]
]

println m.collectEntries { [(it.key) : (it.value.name)] }
// [nephew1:Huey, nephew2:Dewey, nephew3:Louie]