Control Flow.md

Control Flow

if Expressions

let num = 1;

if num > 0 {
	// statements
} else if num == 1 {
	// statements
} else {
	// statements
}

let condition = true;
let num = if condition { 5 } else { 6 };

Repetition with Loops

• Rust has three kinds of loops: loop, while, and for.

Repeating Code with loop

• Executes a block of code over and over again forever until explicitly exited.
• break and continue can be used to control the execution of the loop.
• break can also be used to return a value from the loop while simultaneously exiting the loop.
• Loops can also be labeled which is helpful in disambiguation where nested loops with break or continue statements are used.

fn main() {
	let mut condition = 0;
	let result = loop {
		counter += 1;
		if counter == 10 {
			break counter * 2; // Return value. Technicaly an expression.
		}
	};

	'counting_up: loop { // loop label
		// statements
		break 'counting_up
	}
}

Conditional Loops with while

let num = 2;
while num != 0 {
	// statements
}

Looping through a Collection with for

• Most commonly used loop construct in Rust due to the conciseness and safety.

let a = [1, 2, 3, 4];
for element in a {
	// statemnts
}

for num in (1..4) { // specify number range
	// statements
}