2016 Update

Task/Averages-Pythagorean-means/JavaScript/averages-pythagorean-means-3.js

@@ -0,0 +1,32 @@
+(() => {
+
+    // arithmeticMean :: [Number] -> Number
+    const arithmeticMean = xs =>
+        xs.reduce((sum, n) => sum + n, 0) / xs.length;
+
+    // geometricMean :: [Number] -> Number
+    const geometricMean = xs =>
+        Math.pow(xs.reduce((product, x) => product * x, 1), 1 / xs.length);
+
+    // harmonicMean :: [Number] -> Number
+    const harmonicMean = xs =>
+        xs.length / xs.reduce((invSum, n) => invSum + (1 / n), 0);
+
+
+    // TEST
+    const values = [arithmeticMean, geometricMean, harmonicMean]
+        .map(f => f([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])),
+
+        mean = {
+            Arithmetic: values[0],
+            Geometric: values[1],
+            Harmonic: values[2]
+        };
+
+    return JSON.stringify({
+        values: mean,
+        test: `is A >= G >= H ? ${mean.Arithmetic >= mean.Geometric &&
+            mean.Geometric >= mean.Harmonic ? "yes" : "no"}`
+    }, null, 2);
+
+})();