Improve examples code style

Author: tshemsedinov

JavaScript/4-introspection.js

@@ -21,7 +21,7 @@ console.log('Arguments: ');
 console.dir({
   inc: inc.length,
   sum: sum.length,
-  max: max.length
+  max: max.length,
 });
 
 console.log('Anonymous function: ' + function(x) { return x; }.name);
@@ -31,5 +31,5 @@ console.log('toString: ');
 console.dir({
   inc: inc.toString(),
   sum: sum.toString(),
-  max: max.toString()
+  max: max.toString(),
 });

JavaScript/6-rest.js

@@ -8,8 +8,9 @@ f1(1, 2, 3);
 
 const f2 = (...args) => {
   args.forEach(arg => {
-    console.log('Type: ' + typeof arg);
-    if (typeof arg === 'object') {
+    const type = typeof arg;
+    console.log('Type: ' + type);
+    if (type === 'object') {
       console.log('Value: ' + JSON.stringify(arg));
     } else {
       console.log('Value: ' + arg);

JavaScript/7-new.js

@@ -5,5 +5,5 @@ const sum = new Function('a, b', 'return a + b');
 console.dir({
   name: sum.name,
   length: sum.length,
-  toString: sum.toString()
+  toString: sum.toString(),
 });