class Person {    
    def firstName
    def lastName
    def emailAddress
}

// map constructors
bob = new Person(firstName:"Bob", lastName:"Jones", emailAddress:"bob.jones@yahoo.com")
rob = new Person(firstName:"Rob", lastName:"Fake", emailAddress:"rob.fake@gmail.com")
ray = new Person(firstName:"Ray", lastName:"Real", emailAddress:"ray.real@gmail.com")
tom = new Person(firstName:"Tom", lastName:"Real", emailAddress:"tom.real@yahoo.com")
mike = new Person(firstName:"Mike", lastName:"Test", emailAddress:"mike.test@msn.com")
drew = new Person(firstName:"Drew", lastName:"Wilkins", emailAddress:"dwilkins@aol.com")

// list of persons
def list = [bob, rob, ray, tom, mike, drew]

// handle all cases method
def printPersons(list, clos) {
    list.each() {
        if(clos(it)) { 
            println "$it.firstName $it.lastName"
        }
    }
}

// results
printPersons(list) { it.firstName.startsWith("R") } // firstName starts with 'R'
println "*"*20
printPersons(list) { it.emailAddress.contains("yahoo") } // emailAddress contains 'yahoo'
println "*"*20
printPersons(list) { it.lastName.getAt(-1) == "e" } // last letter of lastName is 'e'
println "*"*20
printPersons(list) { it.lastName.getAt(-1) == "s" } // last letter of lastName is 's'
println "*"*20
printPersons(list) { it.emailAddress.contains("gmail") } // emailAddress contains 'gmail'