feat: So you think you know fizzbuzz

Signed-off-by: Vincent Boutour <[email protected]>

sample/tdd/src/fizzBuzz.js

@@ -1,12 +1,16 @@
-module.exports = (number) => {
-  if (number % 15 === 0) {
-    return 'fizzbuzz';
-  }
-  if (number % 3 === 0) {
-    return 'fizz';
-  }
-  if (number % 5 === 0) {
-    return 'buzz';
-  }
-  return number;
+module.exports = {
+  simple: (number) => {
+    if (number % 15 === 0) {
+      return 'fizzbuzz';
+    }
+    if (number % 3 === 0) {
+      return 'fizz';
+    }
+    if (number % 5 === 0) {
+      return 'buzz';
+    }
+    return number;
+  },
+  optimized: (number) =>
+    [number, 'fizz', 'buzz', 'fizzbuzz'][3 & (19142723 >> (2 * (number % 15)))],
 };

sample/tdd/src/fizzBuzz.test.js

@@ -1,5 +1,5 @@
 const test = require('ava');
-const fizzBuzz = require('../src/fizzBuzz.js');
+const fizzBuzz = require('../src/fizzBuzz.js').simple;
 
 test('should return the first value', (t) => {
   t.is(fizzBuzz(1), 1);