Diffusion Ant (slabs) Code

ant/examples/demo/fizzbuzz.js
327d21970a03slabs

fizzbuzz.js
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			function fizzbuzz(n) {
			const result = [];
			for (let i = 1; i <= n; i++) {
			if (i % 15 === 0) result.push('FizzBuzz');
			else if (i % 3 === 0) result.push('Fizz');
			else if (i % 5 === 0) result.push('Buzz');
			else result.push(i);
			}
			return result;
			}

			function fizzbuzz_bitwise(n) {
			const result = new Array(n);
			const F = 'Fizz',
			B = 'Buzz',
			FB = 'FizzBuzz';

			const mask = new Uint8Array([0, 0, 1, 0, 2, 1, 0, 0, 1, 2, 0, 1, 0, 0, 3]);

			for (let i = 0; i < n; ) {
			const batch = Math.min(15, n - i);
			for (let j = 0; j < batch; j++, i++) {
			const m = mask[i % 15];
			result[i] = m === 0 ? i + 1 : m === 1 ? F : m === 2 ? B : FB;
			}
			}
			return result;
			}

			function fizzbuzz_unrolled(n) {
			const r = new Array(n);
			const F = 'Fizz',
			B = 'Buzz',
			FB = 'FizzBuzz';
			let i = 0,
			num = 1;

			while (i + 15 <= n) {
			r[i++] = num++;
			r[i++] = num++;
			r[i++] = F;
			num++;
			r[i++] = num++;
			r[i++] = B;
			num++;
			r[i++] = F;
			num++;
			r[i++] = num++;
			r[i++] = num++;
			r[i++] = F;
			num++;
			r[i++] = B;
			num++;
			r[i++] = num++;
			r[i++] = F;
			num++;
			r[i++] = num++;
			r[i++] = num++;
			r[i++] = FB;
			num++;
			}

			const rem = [0, 0, 1, 0, 2, 1, 0, 0, 1, 2, 0, 1, 0, 0];
			const w = [0, F, B];
			while (i < n) {
			const m = rem[i % 15];
			r[i++] = m ? w[m] : num;
			num++;
			}

			return r;
			}

			function benchmark(name, fn, n, iterations = 100) {
			for (let i = 0; i < 10; i++) fn(n);

			const start = performance.now();
			for (let i = 0; i < iterations; i++) fn(n);
			const end = performance.now();

			const avg = (end - start) / iterations;
			console.log(`${name}: ${avg.toFixed(3)}ms for n=${n}`);
			return avg;
			}

			const N = 1_000;
			console.log(`\nbenchmarking FizzBuzz implementations (n=${N.toLocaleString()}):\n`);

			benchmark('normal', fizzbuzz, N);
			benchmark('bitwise', fizzbuzz_bitwise, N);
			benchmark('unrolled', fizzbuzz_unrolled, N);

			function verify(fn) {
			const r = fn(15);
			const expected = [1, 2, 'Fizz', 4, 'Buzz', 'Fizz', 7, 8, 'Fizz', 'Buzz', 11, 'Fizz', 13, 14, 'FizzBuzz'];
			return JSON.stringify(r) === JSON.stringify(expected);
			}

			console.log('\ncorrectness check:');
			console.log('normal:', verify(fizzbuzz));
			console.log('bitwise:', verify(fizzbuzz_bitwise));
			console.log('ultimate:', verify(fizzbuzz_unrolled));

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