Creating object pools in Phaserjs

example.js

//  create a group that will hold all the targets
var setupTarget = function() {
      targetPool = game.add.group();
      
      // enable physics
      targetPool.enableBody = true;
      targetPool.physicsBodyType = Phaser.Physics.ARCADE;
      
      // pre-create a pool
      targetPool.createMultiple(15, 'target');
      
      // set default properties
      targetPool.setAll('scale.x', 1.5);
      targetPool.setAll('scale.y', 1.5);
      targetPool.setAll('anchor.x', 0.5);
      targetPool.setAll('anchor.y', 0.5);
      targetPool.setAll('outOfBoundsKill', true);
      targetPool.setAll('checkWorldBounds', true);
}

// Actualyl spawn a new one
var spawnTarget = function () {
        // they're all alive, can't spawn a new one (without removing an existing one)
        if (this.targetPool.countDead() <= 0) return;
        
        // get reference to a target from the pool
        var target = targetPool.getFirstExists(false);

        // enable physics (not sure if you have to do this one);
        game.physics.enable(target, Phaser.Physics.ARCADE);

        // this is like game.add, place target in a new location
        target.reset(-50, game.rnd.integerInRange(200, game.height - 200), 1);

        // set some defaults
        target.body.allowGravity = true;
        target.body.moves = true;
        target.body.gravity.setTo(0, 500);
        target.body.drag.x = 10;
        target.body.bounce = 0.5;
        target.body.velocity.setTo(700, -350);

        // enable input, run callback addToScore on input UP
        target.inputEnabled = true;
        target.events.onInputDown.add(addToScore, this);
    },