Your very first Scratch program where something moved under its own steam might have looked like this.

You might have attached this script to the Cat sprite, and when the green flag was clicked, the cat would have appeared at the top of the stage, and then continually moved downward with a slight delay between each step.

Pretty simple Scratching.

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We're going to do the same thing in Javascript, but you may have noticed there's a couple of problems:

• We haven't seen anything like a "sprite"
• We haven't seen a "forever" loop