ES6 syntax and groups

[pete796 0]

Hi, 

I'm working through some Phaser tutorials and have questions regarding the code below (the es6 syntax is throwing me).

I understand the code extends phaser,group, however, I'm unsure what:

1) the 'parent' parameter is used for.
 2)  this.create is used for.

Any help is greatly appreciated 

export default class NumberBox extends Phaser.Group {
       constructor(game, bgasset, val, parent) {
         super(game, parent);
         this.create(0, 0 bgasset);
              }

}