Rust Loop Constructs: loop, while, and for

Snippet

Rust Loop Constructs: loop, while, and for

Rust provides three main loop constructs. 'loop' creates an infinite loop that can break with a value. 'while' loops execute as long as a condition is true. 'for' loops iterate over ranges or iterators and are the most idiomatic way to loop in Rust, providing both safety and readability.

snippet.rs

rust

fn main() {
    // Infinite loop with break
    let mut count = 0;
    let result = loop {
        count += 1;
        if count == 3 { break count * 2; }
    };
    println!("Loop result: {}", result);
 
    // While loop
    let mut n = 0;
    while n < 3 {
        print!("{} ", n);
        n += 1;
    }
    println!();
 
    // For loop with range
    for i in 0..3 {
        print!("{} ", i);
    }
    println!();
 
    // For loop with iterator
    let items = vec![10, 20, 30];
    for item in items.iter() {
        print!("{} ", item);
    }
}

Breakdown

loop { ... break count * 2; }

Infinite loop that returns a value via break

while n < 3 { ... }

Condition-based loop that checks before each iteration

for i in 0..3 { ... }

Range iteration from 0 (inclusive) to 3 (exclusive)

for item in items.iter() { ... }

Iterates over a collection using an iterator

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Rust Loop Constructs: loop, while, and for

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