2016 Update

Task/Function-composition/JavaScript/function-composition-4.js

@@ -0,0 +1,21 @@
+(() => {
+    'use strict';
+
+
+    // compose :: [(a -> a)] -> (a -> a)
+    let compose = fs => x => fs.reduceRight((a, f) => f(a), x);
+
+
+    // TEST a composition of 3 functions (right to left)
+
+    let sqrt = Math.sqrt,
+
+        succ = x => x + 1,
+
+        half = x => x / 2;
+
+
+    return compose([half, succ, sqrt])(5);
+
+    // --> 1.618033988749895
+})();