Is it possible to instantiate nun prefab?

I am new to cocos creator. I am going through the examples in there.

There was an example scene called “Shooter” under collider folder.
It has following code…

bullet: {
        default: null,
        type: cc.Node
    }

then …

cc.eventManager.addListener({
        event: cc.EventListener.TOUCH_ONE_BY_ONE,
        onTouchBegan: (touch, event) => {
            var touchLoc = touch.getLocation();
            
            var bullet = cc.instantiate(this.bullet);
            bullet.position = touchLoc;
            bullet.active = true;
            bullet.zIndex = -1;
            scene.addChild(bullet);
            return true;
        },
    }, this.node);

Is it possible to instantiate a nun prefab like that?

What does => do?
When I changed it to function(touch, event) { …
It stopped working

Can anyone help?