closures.js
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closures.js
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	function test1() {
	function inner() {
	return 42;
	}
	return inner();
	}
	for (let i = 0; i < 110; i++) test1();
	console.log('[test1] simple inner fn:', test1(), 'ok:', test1() === 42);

	function test2(x) {
	function inner() {
	return x;
	}
	return inner();
	}
	for (let i = 0; i < 110; i++) test2(i);
	console.log('[test2] capture param:', test2(99), 'ok:', test2(99) === 99);

	function test3() {
	let val = 100;
	function inner() {
	return val;
	}
	return inner();
	}
	for (let i = 0; i < 110; i++) test3();
	console.log('[test3] capture local:', test3(), 'ok:', test3() === 100);

	function test4() {
	let count = 0;
	function inc() {
	count = count + 1;
	}
	inc();
	inc();
	inc();
	return count;
	}
	for (let i = 0; i < 110; i++) test4();
	console.log('[test4] mutate upval:', test4(), 'ok:', test4() === 3);

	function test5() {
	let n = 0;
	function next() {
	n = n + 1;
	return n;
	}
	next();
	next();
	return next();
	}
	for (let i = 0; i < 110; i++) test5();
	console.log('[test5] counter:', test5(), 'ok:', test5() === 3);

	function test6() {
	let x = 10;
	return function () {
	return x;
	};
	}
	let fn6 = test6();
	console.log('[test6] returned closure:', fn6(), 'ok:', fn6() === 10);

	function test7() {
	let fns = [];
	for (let i = 0; i < 5; i++) {
	fns.push(function () {
	return i;
	});
	}
	return fns[0]() + fns[1]() + fns[2]() + fns[3]() + fns[4]();
	}
	console.log('[test7] loop closures:', test7(), 'ok:', test7() === 10);

	function test8(n) {
	let sum = 0;
	function addTo(x) {
	sum = sum + x;
	}
	for (let i = 0; i < n; i++) addTo(i);
	return sum;
	}
	for (let i = 0; i < 110; i++) test8(10);
	let r8 = test8(1000);
	let e8 = (999 * 1000) / 2;
	console.log('[test8] hot closure call:', r8, 'ok:', r8 === e8);

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