Change usage example and comments

Author: tshemsedinov

JavaScript/1-functor-proto.js

@@ -12,5 +12,8 @@ Maybe.prototype.map = function(fn) {
   }
 };
 
+// Usage
+
+new Maybe(5).map().map(console.log);
 new Maybe(5).map(x => x * 2).map(console.log);
 new Maybe(null).map(x => x * 2).map(console.log);

JavaScript/2-functor-proto-fp.js

@@ -8,5 +8,8 @@ Maybe.prototype.map = function(fn) {
   return new Maybe(this.x && fn ? fn(this.x) : null);
 };
 
+// Usage
+
+new Maybe(5).map().map(console.log);
 new Maybe(5).map(x => x * 2).map(console.log);
 new Maybe(null).map(x => x * 2).map(console.log);

JavaScript/3-functor.js

@@ -10,5 +10,10 @@ function maybe(x) {
   };
 }
 
+// Usage
+
+maybe(5)()(console.log);
+maybe(5)(x => ++x)(console.log);
 maybe(5)(x => x * 2)(console.log);
 maybe(null)(x => x * 2)(console.log);
+maybe(5)(x => x * 2)(x => ++x)(console.log);

JavaScript/4-functor-fp.js

@@ -2,8 +2,10 @@
 
 const maybe = x => fn => maybe(x && fn ? fn(x) : null);
 
-maybe(5)(x => ++x)(console.log);
-maybe(5)(x => x * 2)(x => ++x)(console.log);
+// Usage
 
-maybe(5)(null)(console.log);
+maybe(5)()(console.log);
+maybe(5)(x => ++x)(console.log);
+maybe(5)(x => x * 2)(console.log);
 maybe(null)(x => x * 2)(console.log);
+maybe(5)(x => x * 2)(x => ++x)(console.log);

JavaScript/5-functor-ap.js

@@ -14,6 +14,8 @@ Maybe.prototype.ap = function(maybe) {
   ))));
 };
 
+// Usage
+
 const a = new Maybe(5);
 const f1 = new Maybe(x => x * 2);
 const f2 = new Maybe(x => ++x);

JavaScript/6-functor-ap-fp.js

@@ -11,6 +11,8 @@ fp.maybe = x => {
   return map;
 };
 
+// Usage
+
 fp.maybe(5)(x => x * 2)(x => ++x)(console.log);
 fp.maybe(5)(x => x * 2).ap(fp.maybe(x => ++x))(console.log);
 fp.maybe(5).chain(x => fp.maybe(x * 2))(x => ++x)(console.log);

JavaScript/7-functor-path.js

@@ -15,7 +15,7 @@ fp.path = data => (
 
 fp.maybe = x => fn => fp.maybe(x && fn ? fn(x) : null);
 
-// Usage example:
+// Usage
 
 const fs = require('fs');
 
@@ -33,7 +33,7 @@ const config = {
   }
 };
 
-// Imperative style:
+// Imperative style
 
 if (
   config &&
@@ -50,7 +50,7 @@ if (
   });
 }
 
-// Functional style:
+// Functional style
 
 fp.path(config)('server.ssl.key.filename')(
   file => fs.readFile(file, (err, data) => {