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uncaught type error in game loop


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I have this slice of code which works but is throwing an error in the console.

Uncaught type error. Cannot read property of x at undefined.

I am using the game loop to move a sprite on its x and y axis. The code works but i get an error and I would be interested to know why.

Also when i try to introduce, 

let state = play; so i can change the call that requests the play(); function to state(); my code stops working. I would like to be able to change the value of state so i can change which function I call by changing the value of state variable. 

Does any wise member know where i am going wrong?


function gameLoop() {


    //Update the current game state:

    //Render the stage


  function play() {

    explorer.x += explorer.vx;
    explorer.y += explorer.vy;

Thanks guys.





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