Hare by Example: Loops

Hare offers a few ways to perform loops with `for`. There are traditional truth-based loops, for-each loops, and iterators. Iterators are later on.

use fmt;

fn should_stop(counter: size) bool = {
	return (counter == 10z);
};

export fn main() void = {
	const items = ["one", "two", "three"];

	// Traditional loop with incrementing index
	for (let i = 0z; i < len(items); i += 1) {
		fmt::printf("Index {} has {}\n", i, items[i])!;
	};

	// Loop forever until a complex condition is met and break out
	let counter = 0z;
	for (true) {
		if (should_stop(counter)) {
			break;
		};
		counter += 2;
		fmt::println(counter)!;
	};

	// For-each loop
	for (let item .. items) {
		fmt::println(item)!;
	};
};

$ hare run loops.ha 
4/4 tasks completed (100%)
Index 0 has one
Index 1 has two
Index 2 has three
2
4
6
8
10
one
two
three