bench_object_spread.cjs
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bench_object_spread.cjs
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	const now = () =>
	typeof performance !== 'undefined' && performance.now ? performance.now() : Date.now();

	function bench(name, fn, iters = 1) {
	fn();
	const t0 = now();
	for (let i = 0; i < iters; i++) fn();
	const dt = now() - t0;
	const per = (dt / iters).toFixed(6);
	console.log(`${name}: ${dt.toFixed(2)} ms total, ${per} ms/iter (${iters} iters)`);
	}

	const visibleSymbol = Symbol('visible');
	const getterSymbol = Symbol('getter');

	function makePlainSource() {
	return {
	a: 1,
	b: 2,
	c: 3,
	d: 4,
	e: 5,
	f: 6,
	};
	}

	function makeMixedSource() {
	return {
	a: 1,
	b: 2,
	c: 3,
	d: 4,
	[visibleSymbol]: 5,
	};
	}

	function makeGetterSource() {
	const obj = {
	a: 1,
	b: 2,
	c: 3,
	d: 4,
	};

	Object.defineProperty(obj, getterSymbol, {
	enumerable: true,
	get() {
	return 42;
	},
	});

	return obj;
	}

	function spreadPlain() {
	const src = makePlainSource();
	return { ...src };
	}

	function spreadMixedSymbol() {
	const src = makeMixedSource();
	return { ...src };
	}

	function spreadSymbolGetter() {
	const src = makeGetterSource();
	return { ...src };
	}

	console.log('=== Object Spread Benchmark ===\n');

	bench('spread plain object', spreadPlain, 200_000);
	bench('spread enumerable symbol', spreadMixedSymbol, 200_000);
	bench('spread enumerable symbol getter', spreadSymbolGetter, 100_000);

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