Array Basics and Iteration

Snippet

Array Basics and Iteration

Arrays in Rust have fixed size known at compile time. Access elements with zero-based indexing. Use .iter() to iterate, .enumerate() for indices. Slices (&[T]) are references to a portion of an array with dynamic length at runtime.

snippet.rs
rust
fn main() {
    let scores: [i32; 4] = [95, 87, 92, 78];
    
    println!("Total scores: {}", scores.len());
    
    for (index, score) in scores.iter().enumerate() {
        println!("Score {}: {}", index + 1, score);
    }
    
    let first = scores[0];
    let last = scores[scores.len() - 1];
    
    let slice = &scores[1..3];
    println!("Middle two: {:?}", slice);
}

Breakdown

let scores: [i32; 4] = [95, 87, 92, 78];

Fixed-size array of 4 i32 values

scores.iter().enumerate()

Creates iterator with index-value pairs

scores[0] and scores[scores.len() - 1]

First and last element access

&scores[1..3]

Slice referencing indices 1 and 2

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