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"Extends existing class on fly." What this means?!
given in there.
2 Réponses
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"on the fly" means "while doing something else"
A person might call their spouse while flying home from a business trip. The phone call does not interrupt the trip, it's done "on the fly".
In the context of a computer program, the changes are made without interrupting / stopping the already-running program.
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thanks :)