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Prototype access ::
Learn Prototype access :: in CoffeeScript with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
Prototype access :: is an atomic CoffeeScript topic inside Classes. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what Prototype access :: changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
class User
User::kind = "member"
console.log new User().kind
Pay attention to the contract exposed by the type, which members belong to instances versus the type itself, and what dispatch occurs at runtime.