RUST Map function

A 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.

The map method offers a way to apply a function (or a closure) on each element from a list. 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. In Rust, the map method is frequently used to interact with vectors and any other types which can be represented as an Iterator.

Let's illustrate this with an example. Imagine a list of numbers (a vector of numbers) and we would like to multiply each number by 10.

Example of RUST Map Function

fn main() {
    let numbers = vec![3, 6, 9, 12];
    let result: Vec<i32> = numbers.iter().map(|n| n * 10).collect();
    println!("{:?}", result);
}

Output

[30, 60, 90, 120]

Conclusion

In this page (written and validated by A. Gawali) you learned about Rust Map function . What's Next? If you are interested in completing Rust tutorial, your next topic will be learning about: Rust Map Object - HashMap.

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