Combine closures with iterators in Rust by passing anonymous functions to methods like map or filter to process collections while capturing external variables.
Use closures with iterators by defining an anonymous function that captures variables and passing it to iterator methods like map, filter, or for_each.
let numbers = vec![1, 2, 3, 4, 5];
let multiplier = 2;
let doubled: Vec<i32> = numbers
.iter()
.map(|&n| n * multiplier)
.collect();
println!("{:?}", doubled); // [2, 4, 6, 8, 10]
This pattern allows you to process collections declaratively while accessing external state.
Closures are small, anonymous functions that can remember variables from where they were created. When combined with iterators, they let you define custom actions for processing lists of data without writing repetitive loops. Think of it like giving a specific instruction to a conveyor belt that applies to every item passing by.