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The JavaScript Variables badge will teach you everything you need to know about variables, how they are created and used, and how JavaScript handles some special cases of variable creation.The JavaScript Variables badge will teach you everything you need to know about variables, how they are created and used, and how JavaScript handles some special cases of variable creation.The JavaScript Variables badge will teach you everything you need to know about variables, how they are created and used, and how JavaScript handles some special cases of variable creation.