How to implement the falling objects that will disappear when a certain region?

Hello! There is a task, I need to implement objects that continuously move down to the bottom of the page and then disappear and appear new. The speed of all objects are different. Without frameworks need to be realized in pure js
June 10th 19 at 16:18
2 answers
June 10th 19 at 16:20
requestAnimationFrame and delete the object when it comes to certain coordinates
June 10th 19 at 16:22

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