What is Nostr?
arvin
npub12zk…az8h
2024-09-07 04:13:30
in reply to nevent1q…aj22

arvin on Nostr: Btw it's a pretty decent analogy. I followed it up with one more prompt **Prompt:** ...

Btw it's a pretty decent analogy. I followed it up with one more prompt

**Prompt:**
How is a mutable borrow different from a move in this analogy

**Response:**
Great question! Here's how a mutable borrow differs from a move in the toy analogy:

- **Move (Ownership Transfer):** When you **move** the toy to your friend, you're giving them the toy entirely. They now own it, and you can't access it at all until they give it back (if they ever do). You don't control it anymore. In Rust, this is like transferring ownership, and you lose access to the value.

- **Mutable Borrow:** When you **mutably borrow** the toy, you're letting your friend **temporarily** play with it, but you still own it. They can change or modify the toy, but they have to return it to you once they’re done. During this time, you can't touch the toy (nor can anyone else), but you will get it back once they finish. In Rust, this allows the borrower to modify the value, but you still have ownership and will regain full control later.

In short:
- With a **move**, you permanently hand over control.
- With a **mutable borrow**, you temporarily let someone else use and modify the item, but you retain ownership.

So, in the analogy:
- **Move** = "Here, take the toy, it's yours now."
- **Mutable Borrow** = "You can play with the toy for a bit, but give it back when you're done."
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