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// Simple sorting with Java8 APIs

// Separation key-extraction from key ordering

// Simple demo for Comparator.comparing
// http://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html#comparing-java.util.function.Function-

// data to be sorted
var cards = [
   { name: "hello", email: "foo@hello.com" },
   { name: "world", email: "bar@world.com" },
   { name: "see", email: "see@dontsee.com" },
];

var Collections = java.util.Collections;
var Comparator = java.util.Comparator;

// sort records name in reverse order of names
Collections.sort(cards,
  Comparator.comparing(function(a) a.name).reversed());

print(JSON.stringify(cards))

// sort records by email
Collections.sort(cards,
  Comparator.comparing(function(a) a.email));

print(JSON.stringify(cards))