Rust iter and into iter

来自WHY42
  • iter() iterates over the items by reference
  • iter_mut() iterates over the items, giving a mutable reference to each item
  • into_iter() iterates over the items, moving them into the new scope

So for x in my_vec { ... } is essentially equivalent to my_vec.into_iter().for_each(|x| ... ) - both move the elements of my_vec into the ... scope.

If you just need to look at the data, use iter, if you need to edit/mutate it, use iter_mut, and if you need to give it a new owner, use into_iter.[1] [2]

  1. ↑ https://stackoverflow.com/questions/34733811/what-is-the-difference-between-iter-and-into-iter
  2. ↑ https://hermanradtke.com/2015/06/22/effectively-using-iterators-in-rust.html/
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