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How do you manage plugin state efficiently?

Senior JQuery
Quick Answer Manage plugin state with .data(): var state = $el.data("myPlugin") || {}; state.isOpen = true; $el.data("myPlugin", state). State is tied to the element - automatically cleaned up when the element is removed. For complex plugins, use a class or plain object to represent the state, and store a reference to the instance in .data().

Answer

Store state using .data().
Use namespaced keys.
Avoid global variables to keep instances independent.
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