Some JavaScript optimizations

Author: tshemsedinov

JavaScript/2-functor-proto-fp.js

@@ -5,7 +5,7 @@ function Maybe(x) {
 }
 
 Maybe.prototype.map = function(fn) {
-  return (this.x && fn) ? new Maybe(fn(this.x)) : new Maybe(null);
+  return new Maybe(this.x && fn ? fn(this.x) : null);
 };
 
 new Maybe(5).map(x => x * 2).map(console.log);

JavaScript/3-functor.js

@@ -1,3 +1,5 @@
+'use strict';
+
 function maybe(x) {
   return function(fn) {
     if (x && fn) {

JavaScript/6-functor-ap-fp.js

@@ -11,7 +11,7 @@ api.fp.maybe = x => {
   map.ap = fnA => fnA(fn => api.fp.mapNull(fn, x));
   map.chain = fnM => fnM(x);
   return map;
-}
+};
 
 api.fp.maybe(5)(x => x * 2)(x => ++x)(console.log);
 api.fp.maybe(5)(x => x * 2).ap(api.fp.maybe(x => ++x))(console.log);