iter() method on the vector in order to obtain an iterator. We declare a new variable called numbers and use the macros vec! in order to initialize a new vector with the provided number values. Imagine a list of numbers (a vector of numbers) and we would like to multiply each number by 10. In Rust, the map method is frequently used to interact with vectors and any other types which can be represented as an Iterator. This is key in functional programming methodologies and offers a way to transform a collection of type A, to a collection of elements of type B. The map method offers a way to apply a function (or a closure) on each element from a list. In which scenarios the Map function may produce unexpected results.Ī core concept for Functional programming, Map is also commonly used as a tool for dealing with lists and collections in Rust and is one of the most essential methods for working with Iterators. How to manipulate Vectors and collections using Iterators. map() function when working with Iterators. What Will You Learn #Īfter reading this article, you will know: If you are interested in getting started with Rust, the official Learn Rust guide provides excellent pointers to resources and getting started content. To make things easier, this article includes detailed code samples and links to the Rust playground where you can execute and study the provided code snippets. In order to follow along, you will need at least some familiarity with the Rust programming language. Iterators cover a very large number of applications and as such, being comfortable with their use greatly facilitates becoming a better Rust developer. This may surprise you at first, especially if you are coming from other programming languages (for example Swift or JavaScript), where working with types like lists and arrays does not immediately expose the concept of Iterators. In this article, we are going to focus on Iterators - one of the key language tools enabling us to write idiomatic Rust code. Getting into the Rust mindset allows us, developers, to intuitively discover aspects of the language and gain the ability to write better and more consistent code. From toolchains to documentation and language specifications, almost every aspect of the language adheres to a certain level of consistency. Arguably one of the main reasons the Rust language has become so popular is because the entire ecosystem builds upon a consistent experience.
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