# What is the best way to handle multiples objects?

**URL:** <https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518>\
**Category:** Phaser 3\
**Created:** [September 27, 2020, 3:11pm UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518 "2020-09-27T15:11:04Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![mmVac](https://avatars.discourse-cdn.com/v4/letter/m/97f17d/32.png) [@mmVac](https://phaser.discourse.group/u/mmVac)\
**Post date:** [September 27, 2020, 3:11pm UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518/1 "2020-09-27T15:11:04Z")

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Hello,

What is the best way to handle multiples objects? I have created 5 of them, but I can work around with only one. What should I do to handle all objects in my ‘moveEnemy’ functions?

```
//scene.js
 
create() {
    for (var i = 0; i < 5; i++) {
      this.enemy = this.physics.add.existing(new Enemy(this)); //I've messed up here.
}
 
update() {
    this.moveEnemy(this.enemy);
}
 
moveEnemy(enemy) {
    if (enemy.y > config.height) {
      this.resetPos(this.enemy);
    }
}
 
resetPos(enemy) {
    this.enemy.y = Phaser.Math.Between(-200, 0);
    this.enemy.x = Phaser.Math.Between(0, config.width);
}
 
 
 
//enemy.js
 
class Enemy extends Phaser.GameObjects.Sprite {
  constructor(scene) {
    var x = Phaser.Math.Between(0, config.width);
    var y = Phaser.Math.Between(-500, -50);
    super(scene, x, y, "enemy");
 
    this.scene.add.existing(this);
 
    this.scene.physics.world.enableBody(this);
    this.body.velocity.y = 100;
}
```

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<div class="post-metadata">

**Author:** ![BlunT76](https://yyz2.discourse-cdn.com/free1/user_avatar/phaser.discourse.group/blunt76/32/1454_2.png) [@BlunT76](https://phaser.discourse.group/u/BlunT76)\
**Post date:** [September 27, 2020, 3:39pm UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518/2 "2020-09-27T15:39:12Z")

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Hi,  
I handle enemies individually in their own class, moveEnemy and resetPos should go in the Enemy class

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<div class="post-metadata">

**Author:** ![mmVac](https://avatars.discourse-cdn.com/v4/letter/m/97f17d/32.png) [@mmVac](https://phaser.discourse.group/u/mmVac)\
**Post date:** [September 27, 2020, 3:46pm UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518/3 "2020-09-27T15:46:42Z")

</div>

Thank you for your reply!!!

How do I do it? My class only runs once. So it won’t have it tracked by my moveEnemy and resetPos functions.

Thank you!!

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<div class="post-metadata">

**Author:** ![BlunT76](https://yyz2.discourse-cdn.com/free1/user_avatar/phaser.discourse.group/blunt76/32/1454_2.png) [@BlunT76](https://phaser.discourse.group/u/BlunT76)\
**Post date:** [September 27, 2020, 4:01pm UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518/4 "2020-09-27T16:01:49Z")

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Here’s an example of an enemy class

```javascript
class Enemy extends Phaser.GameObjects.Sprite {
  constructor(scene, x, y, config) {
    super(scene, x, y, config.key);

    this.scene = scene;
    this.scene.physics.world.enable(this);
    this.scene.add.existing(this);
  }

  preUpdate(time, delta) {
    super.preUpdate(time, delta);
    if (this.active && this.body.blocked.down) {
      // here's the logic of your enemy
      this.body.setVelocityX(50)
    }
  }

  moveEnemy() {
    if (this.y > this.scene.height) {
      this.resetPos(this);
    }
  }
 
  resetPos() {
    this.y = Phaser.Math.Between(-200, 0);
    this.x = Phaser.Math.Between(0, this.scene.width);
  }
}

```

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<div class="post-metadata">

**Author:** ![samme](https://yyz2.discourse-cdn.com/free1/user_avatar/phaser.discourse.group/samme/32/5275_2.png) [@samme](https://phaser.discourse.group/u/samme)\
**Post date:** [September 27, 2020, 5:25pm UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518/5 "2020-09-27T17:25:04Z")

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Collect them in an array and iterate.

```javascript
class Scene {
  create () {
    this.enemies = [];

    for (var i = 0; i < 5; i++) {
      this.enemies[i] = this.physics.add.existing(new Enemy(this));
    }
  }

  update () {
    this.enemies.forEach(this.moveEnemy, this);
  }

  moveEnemy (enemy) {
    // …
  }
}

```

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<div class="post-metadata">

**Author:** ![basstabs](https://yyz2.discourse-cdn.com/free1/user_avatar/phaser.discourse.group/basstabs/32/3639_2.png) [@basstabs](https://phaser.discourse.group/u/basstabs)\
**Post date:** [September 29, 2020, 12:43am UTC](https://phaser.discourse.group/t/what-is-the-best-way-to-handle-multiples-objects/7518/6 "2020-09-29T00:43:38Z")

</div>

In my game (A space shooter, so lots of enemies and bullets flying around), every unique gameobject gets their own group. In those groups, runChildUpdate is set to true so that the custom update method I provide in the enemy classes is run during the update frame. From here, I do all of the movement/management/etc. inside the enemy’s update method. The nice thing about this approach is that things like collision scale much easier when you get a lot of different types of objects interacting, and pooling to improve performance is only a matter of populating the groups ahead of time.