Closures Basic

Anonymous functions that capture their environment.

Difficulty

Intermediate

Code

fn main() {
    let add = |a, b| a + b;
    println!("3 + 5 = {}", add(3, 5));

    let name = String::from("Rust");
    let greet = || println!("Hello, {}!", name);
    greet();

    let nums = vec![1, 2, 3];
    let sum: i32 = nums.iter().sum();
    println!("sum = {}", sum);
}

Explanation

Closures capture their environment. Use |args| body syntax.

Key Concepts

• Read the code carefully and understand the data flow
• Try modifying the example to see how it changes behavior
• Run this code in the Rust Playground

Related Topics

Browse more examples in the functions category to build a complete understanding of this topic.