[Verse 1] Let me tell you 'bout a special trait Called Iterator, don't be late It helps you step through data clean The nicest loop you've ever seen With next method calling out Returns Some value or None throughout [Chorus] Iterate, don't hesitate Map and filter, chain your fate Closures capture what you need Variables that help you succeed Lazy evaluation waits Until you call collect or take [Verse 2] Vec and arrays implement this way Iterator trait is here to stay For loop sugar makes it sweet But underneath the pattern's neat Each element comes one by one Until the sequence is all done [Chorus] Iterate, don't hesitate Map and filter, chain your fate Closures capture what you need Variables that help you succeed Lazy evaluation waits Until you call collect or take [Verse 3] Now closures are functions small Anonymous, they capture all Three ways they borrow what's around FnOnce, FnMut, Fn are found Vertical bars hold parameters tight Making functional code feel right [Bridge] Combine them both and see the power Iterator closures every hour Transform your data, make it flow Functional style, watch it grow Rust makes memory safe and sound Best performance can be found [Chorus] Iterate, don't hesitate Map and filter, chain your fate Closures capture what you need Variables that help you succeed Lazy evaluation waits Until you call collect or take [Outro] So remember when you code today Iterators show the Rusty way Closures help you capture state Together they are really great
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