Pluck Underscore.js function added to List Groovy metaClass

pluckGroovy.groovy

/*
One argument:
    -propertyName 
*/
def pluck = { propertyName -> 

    // Collect results filter coincidence by propertyName   
    delegate.collect { element ->
            
        element."$propertyName"
    }          
}
// Add "pluck" to metaClass of List  
List.metaClass.pluck = pluck 
      
def users = [[name:"Joe",age:32],[name:'Jhon',age:20],[name:'Mary',age:25]]
assert users.pluck("name") == ["Joe","Jhon","Mary"]