46 tests with assets and javascript code.

Tests/groups/get first 3.js

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+/// <reference path="../../Phaser/Game.ts" />
+(function () {
+    var game = new Phaser.Game(this, 'game', 800, 600, init, create, update, render);
+
+    var killTimer, reviveTimer, cycle;
+
+    function init() {
+        game.load.spritesheet('item', 'assets/buttons/number-buttons-90x90.png', 90, 90);
+        game.load.image('reviveBtn', 'assets/buttons/revive-button.png');
+        game.load.start();
+    }
+    function create() {
+        // Add some items.
+        var item;
+        for (var i = 0; i < 3; i++) {
+            // Give the items a different alpha increase speed.
+            item = game.add.sprite(290, 98 * (i + 1), 'item', i);
+            // An item besides the left one.
+            item = game.add.sprite(388, 98 * (i + 1), 'item', i + 3);
+        }
+
+        // Set a timer so we can perform an action after a delay.
+        killTimer = 0;
+        // Another timer for reviving.
+        reviveTimer = 0;
+        cycle = 1000;
+    }
+    function update() {
+        // Update timers.
+        killTimer += game.time.delta;
+        reviveTimer += game.time.delta;
+
+        // Kill first alive item every "cycle" duration.
+        if (killTimer > cycle) {
+            killTimer -= cycle;
+            // Get an alive item from the group and kill it.
+            var item = game.world.group.getFirstAlive();
+            if (item) {
+                item.kill();
+            }
+        }
+        // Revive first dead item every 1.5 "cycle" duration.
+        if (reviveTimer > cycle * 1.5) {
+            reviveTimer -= cycle * 1.5;
+            // Get a dead item from the group and revive it.
+            var item = game.world.group.getFirstDead();
+            if (item) {
+                item.revive();
+            }
+        }
+    }
+    function render() {
+        Phaser.DebugUtils.context.fillStyle = '#fff';
+        Phaser.DebugUtils.context.fillText('One item will be killed each second and revived later.', 240, 420);
+        // Get living and dead number of a group.
+        Phaser.DebugUtils.context.fillText('Living: ' + game.world.group.countLiving() + ', Dead: ' + game.world.group.countDead(), 330, 440);
+    }
+})();