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Book Overview & Buying
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Table Of Contents
The Rust Programming Handbook
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In this chapter, we explored the wonderful functional programming features that make Rust such an expressive and powerful language.
We discovered that while Rust is a multi-paradigm language, it thoughtfully incorporates core functional ideas such as immutability and treating functions as first-class values, which helps us write cleaner and more reliable code. The heart of this functional style is Rust’s lazy iterators, offering an efficient way to process sequences of data.
We learned how to create them in different ways (iter(), into_iter(), and iter_mut()), how to transform them with powerful iterator adapters such as map() and filter(), and how to get a final result using consumers such as collect() and fold().
These iterator methods are powered by closures, which are flexible anonymous functions that can capture variables from their environment. We explored their syntax, how they handle ownership through the Fn, FnMut, and FnOnce traits, and how they...