Iterator Patterns

Efficient data processing with lazy iterator chains.

Basic Iterator Chain

// Single pass, lazy evaluation, no intermediate allocations
let result: Vec<_> = data
    .iter()
    .filter(|&&x| x > 2)
    .map(|&x| x * 2)
    .collect();

// Sum without collecting
let sum: i32 = data.iter().filter(|&&x| x > 0).sum();