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Generate random integer problem?

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I'm creating endless style game and  I'm planning to reuse already existing sprites instead of creating new ones. My sprites are coming from the top moving towards the bottom of the screen, when they reach bottom I reset their position.y to 0 which brings them back to the top again, but I also wanted them to have random position.x every time they start again from the top, I called this function:

obstacles.forEach(function(obstacle){if(obstacle.position.y >{obstacle.position.y = 0; obstacle.position.x =,;}})

And after trying it out I got this error from the developers console:


Uncaught TypeError: Cannot read property 'rnd' of undefined

Is it even posibble to call from the update? If not what is the solution for that? Thanks!

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When you pass a function that uses this you must also pass a context for it:

obstacles.forEach(function (obstacle) {
  if (obstacle.position.y > {
    obstacle.position.y = 0;
    obstacle.position.x =,;
}, this);


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