zzstoatzz.io
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languages/ziglang/0.15/arraylist.md
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languages/ziglang/0.15/arraylist.md
···
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defer buf.deinit(alloc); // cleanup when we're done
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try buf.print(alloc, "{s}: {d}", .{ name, value });
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sendResponse(buf.items); // borrow the slice, arraylist still owns it
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sendResponse(buf.items);
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```
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`buf.items` is the `[]u8` slice holding the actual data - a direct view into the arraylist's internal buffer. the arraylist still owns this memory, so don't hold onto it after `deinit`.
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**build and return** - you're building something to give to a caller. they'll own the memory:
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···
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return buf.toOwnedSlice(alloc); // caller must free this
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```
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the key difference: `.items` gives you a view into the arraylist's memory (it still owns it). `.toOwnedSlice()` hands ownership to you (arraylist forgets about it, you must free it).
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the key difference: `.items` borrows (arraylist still owns the memory, will free on `deinit`). `.toOwnedSlice()` transfers ownership (arraylist forgets about it, caller must free).
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see: [dashboard.zig#L187](https://tangled.sh/@zzstoatzz.io/music-atmosphere-feed/tree/main/src/dashboard.zig#L187) for the return pattern
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