Group Vs Self

class Example extends Phaser.Scene
{
    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v385');
        this.load.image('ball', 'assets/sprites/shinyball.png');
    }

    create ()
    {
        const crates = this.physics.add.group({
            key: 'ball',
            quantity: 24,
            bounceX: 1,
            bounceY: 1,
            collideWorldBounds: true,
            velocityX: 300,
            velocityY: 150
        });

        Phaser.Actions.RandomRectangle(crates.getChildren(), this.physics.world.bounds);

        this.physics.add.collider(crates);

        // OR

        // this.physics.add.collider(
        //     crates,
        //     undefined,
        //     function (crate1, crate2)
        //     {
        //         crate1.setAlpha(0.5);
        //         crate2.setAlpha(0.5);
        //     }
        // );
    }
}

const config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    parent: 'phaser-example',
    physics: {
        default: 'arcade',
        arcade: {
            debug: false,
            gravity: { y: 300 }
        }
    },
    scene: Example
};

const game = new Phaser.Game(config);
                        

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