test_for_in_closure.js
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test_for_in_closure.js
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	const obj = { a: 1, b: 1, c: 1 };
	const funcs = [];

	for (let key in obj) {
	funcs.push(() => key);
	}

	const got = funcs.map(fn => fn());
	console.log('for-in let closure:', got.join(' '));

	const expected = ['a', 'b', 'c'];
	if (got.length !== expected.length) {
	throw new Error(`Expected ${expected.length} closures, got ${got.length}`);
	}

	for (let i = 0; i < expected.length; i++) {
	if (got[i] !== expected[i]) {
	throw new Error(`Expected ${expected.join(' ')}, got ${got.join(' ')}`);
	}
	}

	console.log('PASS');