Implement Iterator in Rust
Rust interview exercise on Closures & Iterators, difficulty 3 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Implement Iterator for Fibonacci so it yields 0, 1, 1, 2, 3, 5, ... without end. Writing next() is all it takes to get take, find, filter, sum and the rest for free.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.