Animation in Scratch

Most Scratchers will have used sprites with multiple costumes.

Maybe to change the look of a character from happy to sad when something happens, or to make a butterfly's wings flap.

In this example, the boy sprite has a bunch of costumes that correspond to walking. When the green flag is clicked, the script continuously switches between the costumes of create the illusion of walking.

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We're going to learn to do the same sort of thing in Javascript, but with more power.