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Questions with this tag relate to planning lessons for a specific purpose, such as teaching some coding paradigm or skill. Planning lessons in Computer Science depends on the context and level of the students. If it is a lesson which introduces a new topic, the tag [introductory-lesson] may also be appropriate.
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What is a good analogy for pass by value vs by reference?
Pass by reference. You change the original and everyone sees. For example drawing on the Mona Lisa ruins it for everybody.
Pass by value. You take a photo of the Mona Lisa and you can do what you wan …