Iterator Chain

Chain multiple iterator operations together.

Difficulty

Intermediate

Code

fn main() {
    let words = vec!["hello", "world", "rust", "is", "awesome"];

    let result: String = words.iter()
        .filter(|w| w.len() > 3)
        .map(|w| w.to_uppercase())
        .collect::<Vec<_>>()
        .join(", ");
    println!("{}", result);

    // fold for aggregation
    let sum: i32 = (1..=100).fold(0, |acc, x| acc + x);
    println!("sum 1..100 = {}", sum);
}

Explanation

This example demonstrates how to use iterator chain in Rust. Read the code carefully to understand the flow. Pay attention to where values are created, borrowed, moved, or consumed.

Key Concepts

• Rust's strong type system catches errors at compile time
• Ownership and borrowing rules ensure memory safety
• Pattern matching makes code expressive and exhaustive

Related Topics

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