This is a list of advanced JavaScript learning resources from people who responded to this [Tweet][13] and this [Tweet][20].
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[You Don't Know JS][3]
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[Frontend Masters courses by Kyle Simpson][12]
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[@mpjme][6]'s [YouTube videos][5]
Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.