Map and Filter - Rust Programming

Iterator adaptors build a pipeline. filter keeps matching items and map transforms them before collect.

Program

Play the program to keep even numbers and scale them.

map_filter.rs

fn main() {
    let nums = vec![1, 2, 3, 4, 5];
    let doubled_evens: Vec<i32> = nums.iter().filter(|&&n| n % 2 == 0).map(|&n| n * 10).collect();
    println!("{doubled_evens:?}");
}

filter `filter` keeps items where the predicate is true.

map `map` transforms each remaining item.

collect `collect` gathers the results into a `Vec`.