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hi, i would understand the difference between example 1 and example 2 with the usage of "this.posx" and simply "posx" is it the same ? why in some code i see the usage of this.something ? //example 1 object_physics = function(game,posx,posy,im,Group){ this.posx=posx this.posy=posy Phaser.Sprite.call(this,game,this.posx,this.posy,im) game.physics.arcade.enable(this) this.body.velocity.y=10 Group.add(this) } object_physics.prototype = Object.create(Phaser.Sprite.prototype) object_physics.prototype.constructor = object_physics //example 2 object_physics = function(game,posx,posy,im,Group){ Phaser.Sprite.call(this,game,posx,posy,im) game.physics.arcade.enable(this) this.body.velocity.y=10 Group.add(this) } object_physics.prototype = Object.create(Phaser.Sprite.prototype) object_physics.prototype.constructor = object_physics