Diffusion Ant (type-hints-typescript) Code

ant/tests/bench_object_spread.cjs
899dad6b8a9etype-hints-typescript

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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