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Using Prototype to call a function (method)


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I'm reading this tutorial (2nd part) : http://www.gamefromscratch.com/post/2014/06/24/Adventures-in-Phaser-with-TypeScript-Handling-Keyboard-Input.aspx

in the second exemple, we got something like :

class SimpleGame {

    constructor() {
        this.game = new Phaser.Game(640, 480, Phaser.AUTO, 'content', {
            create: this.create});}

    moveUp(e: KeyboardEvent) {
            this.jetSprite.position.add(0, -1);

    create() {
        this.W.onDown.add(SimpleGame.prototype.moveUp, this);

can someone tell me why we need to use SimpleGame.prototype.moveUp to call this method? (and not just this.moveUP ?) 

is this because we are using this context ?


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