nursery

generators.js.disabled
View Options

			import { test, testDeep, summary } from './helpers.js';

			console.log('Generator Tests\n');

			function* simple() {
			yield 1;
			yield 2;
			yield 3;
			}

			const gen = simple();
			test('first yield', gen.next().value, 1);
			test('second yield', gen.next().value, 2);
			test('third yield', gen.next().value, 3);
			test('done', gen.next().done, true);

			function* withReturn() {
			yield 1;
			return 'final';
			}

			const gen2 = withReturn();
			test('yield before return', gen2.next().value, 1);
			const last = gen2.next();
			test('return value', last.value, 'final');
			test('return done', last.done, true);

			function* counter(start) {
			let i = start;
			while (true) {
			yield i++;
			}
			}

			const c = counter(10);
			test('counter 10', c.next().value, 10);
			test('counter 11', c.next().value, 11);
			test('counter 12', c.next().value, 12);

			function* range(start, end) {
			for (let i = start; i <= end; i++) {
			yield i;
			}
			}

			const arr = [...range(1, 5)];
			testDeep('spread generator', arr, [1, 2, 3, 4, 5]);

			function* twoWay() {
			const x = yield 1;
			const y = yield x + 1;
			yield y + 1;
			}

			const tw = twoWay();
			test('two way first', tw.next().value, 1);
			test('two way second', tw.next(10).value, 11);
			test('two way third', tw.next(20).value, 21);

			summary();