Diffusion Ant (type-hints-typescript) Code

ant/tests/bench_array_from.js
899dad6b8a9etype-hints-typescript

bench_array_from.js
View Options

			const ITERATIONS = 1_000_000;
			const source = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
			const mapFn = x => x * 2;

			// --- Polyfill ---
			const ArrayFrom_polyfill = function (src, mapFn, thisArg) {
			if (src == null) {
			console.error('TypeError: Cannot convert undefined or null to object');
			return [];
			}
			if (mapFn !== undefined && typeof mapFn !== 'function') {
			console.error('TypeError: mapFn is not a function');
			return [];
			}
			const arr = [];
			let i = 0;
			if (src[Symbol.iterator] != null) {
			for (const v of src) arr.push(mapFn ? mapFn.call(thisArg, v, i++) : v);
			} else {
			const len = src.length >>> 0;
			for (; i < len; i++) arr.push(mapFn ? mapFn.call(thisArg, src[i], i) : src[i]);
			}
			return arr;
			};

			// --- Builtin ---
			function benchBuiltin() {
			const start = performance.now();
			for (let i = 0; i < ITERATIONS; i++) {
			Array.from(source, mapFn);
			}
			return performance.now() - start;
			}

			// --- Polyfill ---
			function benchPolyfill() {
			const start = performance.now();
			for (let i = 0; i < ITERATIONS; i++) {
			ArrayFrom_polyfill(source, mapFn);
			}
			return performance.now() - start;
			}

			const builtinMs = benchBuiltin();
			const polyfillMs = benchPolyfill();

			console.log(`Array.from (builtin): ${builtinMs.toFixed(2)} ms`);
			console.log(`Array.from (polyfill): ${polyfillMs.toFixed(2)} ms`);
			console.log(`Ratio: builtin is ${(polyfillMs / builtinMs).toFixed(2)}x ${polyfillMs > builtinMs ? 'faster' : 'slower'} than polyfill`);

Owner Packages

No Owners