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Clean code needs good names. Use these styles to keep your code readable.

JavaScript variables have rules. Use letters, numbers, underscores, and dollar signs.

Do not use hyphens in JS variable names. JavaScript sees a hyphen as a minus sign. A name like first-name causes an error.

Source: https://dev.to/raja_b_0c9d242e2c26cf063b/javascript-naming-conventions-3go5