How to Use Iterator Adapters for Performance in Rust

Iterators Closures

2026-04-17T12:05:42+00:00

Rust iterator adapters enable lazy, zero-allocation data processing pipelines that compile to efficient single-loop code.

Use iterator adapters like map, filter, and collect to chain operations lazily, allowing the compiler to optimize the entire pipeline into a single loop without intermediate allocations. This approach often matches or exceeds the performance of manual for loops while reducing code size and potential for errors.

let numbers = vec![1, 2, 3, 4, 5];
let sum: i32 = numbers.iter()
    .filter(|&&x| x % 2 == 0)
    .map(|&x| x * 2)
    .sum();