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Practice

References: borrow and write through

⭐⭐ intermediate~25 min of coding3 challenges

Warm-up with references: mutate through an alias, count without copying, swap in place.

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What you will practice

  1. Scale through a reference⭐⭐ intermediate
  2. Borrow, don't copy⭐⭐ intermediate
  3. Swap through references⭐⭐ intermediate

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