Looping with for, while, and loop

Snippet

Looping with for, while, and loop

Rust provides three looping constructs. The `for` loop iterates over collections. The `while` loop runs as long as a condition is true. The `loop` keyword creates an infinite loop that must be explicitly broken. The `loop` can also return a value via `break`, which is useful for pattern matching inside loops.

snippet.rs

rust

fn main() {
    let numbers = [1, 2, 3, 4, 5];
 
 
    println!("Using for loop:");
    for num in numbers {
        println!("  Number: {}", num);
    }
 
    println!("\nUsing while loop:");
    let mut count = 0;
    while count < 3 {
        println!("  Count is: {}", count);
        count += 1;
    }
 
    println!("\nUsing infinite loop with break:");
    let mut i = 0;
    let result = loop {
        i += 1;
        if i == 3 {
            break i * 2;
        }
    };
    println!("  Loop result: {}", result);
}

Breakdown

for num in numbers

Iterates over each element in the array, binding it to `num`.

while count < 3

Executes the block repeatedly as long as the condition is true.

let result = loop { ... break i * 2; }

Infinite loop that breaks with a computed value that becomes the result.

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Looping with for, while, and loop

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