Rust Collections — Vectors, Strings, HashMaps, and Collection Operations

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you will learn about Rust Collections. We cover key concepts, practical examples, and best practices to help you master this topic.

Rust collections include Vec for dynamic arrays, String for UTF-8 text, and HashMap for key-value storage with iterators and common methods.

What You'll Learn

Vectors (Vec)
Strings (String, &str)
HashMaps (HashMap<K, V>)
Iterator operations

Why It Matters

Collections are fundamental to programming. DodaZIP uses Vec for file buffers and HashMap for metadata indexing.

Real-World Use

Data storage, Configuration Management, text processing, Caching.

use std::collections::HashMap;

fn main() {
    // Vectors
    let mut v: Vec<i32> = Vec::new();
    v.push(1);
    v.push(2);
    v.push(3);

    let third = &v[2];
    println!("Third: {}", third);

    for i in &v { println!("{}", i); }

    // Strings
    let mut s = String::from("hello");
    s.push_str(", world");
    s.push('!');
    println!("{}", s);

    // HashMap
    let mut scores = HashMap::new();
    scores.insert(String::from("Blue"), 10);
    scores.insert(String::from("Yellow"), 50);

    let team_name = String::from("Blue");
    match scores.get(&team_name) {
        Some(score) => println!("Score: {}", score),
        None => println!("Team not found"),
    }

    for (key, value) in &scores {
        println!("{}: {}", key, value);
    }

    // Iterator operations
    let numbers = vec![1, 2, 3, 4, 5];
    let doubled: Vec<i32> = numbers.iter().map(|x| x * 2).collect();
    let evens: Vec<&i32> = numbers.iter().filter(|x| *x % 2 == 0).collect();
    let sum: i32 = numbers.iter().sum();
    println!("{:?}, {:?}, {}", doubled, evens, sum);
}

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