Vector Basics: Creating and Iterating

Snippet

Vector Basics: Creating and Iterating

Vectors are growable arrays provided by the standard library. They store elements of the same type contiguously in memory. You can create them with Vec::new() or the convenient vec! macro. Use get() for safe index access that returns an Option, avoiding panics from out-of-bounds access.

snippet.rs
rust
fn main() {
    // Creating a new vector
    let mut numbers: Vec<i32> = Vec::new();
    
    // Adding elements with push
    numbers.push(10);
    numbers.push(20);
    numbers.push(30);
    
    // Using vec! macro for quick creation
    let fruits = vec!["apple", "banana", "orange"];
    
    // Iterating with for loop
    for fruit in &fruits {
        println!("Fruit: {}", fruit);
    }
    
    // Getting value at index with get
    if let Some(second) = fruits.get(1) {
        println!("Second fruit: {}", second);
    }
    
    // Check vector length
    println!("Number of fruits: {}", fruits.len());
}

Breakdown

let mut numbers: Vec<i32> = Vec::new();

Creates an empty mutable vector of i32 values

numbers.push(10);

Appends an element to the end of the vector

let fruits = vec!["apple", "banana"];

Macro creates and initializes a vector with values

fruits.get(1)

Safe index access returning Option<&str>

Previous snippet Next snippet

More Beginner Rust exercises →

From your library

Vector Basics: Creating and Iterating

Related