Improve examples code style

JavaScript/2-before-after.js

@@ -1,6 +1,9 @@
 'use strict';
 
-const wrap = (f, before, after) => (...args) => after(f(...before(...args)));
+const wrap =
+  (f, before, after) =>
+  (...args) =>
+    after(f(...before(...args)));
 
 // Usage
 

JavaScript/3-callback.js

@@ -54,7 +54,7 @@ const interfaceName = {
     console.dir({ par1, par2 });
     callback(null, { field: 'value' });
     return par1;
-  }
+  },
 };
 
 const cloned = cloneInterface(interfaceName);

JavaScript/4-wrap-api.js

@@ -31,7 +31,7 @@ const interfaceName = {
   methodAsync(par1, par2, callback) {
     console.dir({ method: { par1, par2 } });
     callback(null, { field: 'value' });
-  }
+  },
 };
 
 const cloned = cloneInterface(interfaceName);

JavaScript/6-timeout-async.js

@@ -26,10 +26,10 @@ const fn100 = timeout(fn, 100);
 const fn200 = timeout(fn, 200);
 
 setTimeout(() => {
-  fn100('first', (err, data) => {
-    console.log('Callback', data);
+  fn100('first', (error, data) => {
+    console.log({ callback: { error, data } });
   });
-  fn200('second', (err, data) => {
-    console.log('Callback', data);
+  fn200('second', (error, data) => {
+    console.log({ callback: { error, data } });
   });
 }, 150);

JavaScript/9-cancelable.js

@@ -4,15 +4,19 @@
 
 const cancelable1 = (fn) => {
   const wrapper = (...args) => (fn ? fn(...args) : null);
-  const cancel = () => fn = null;
+  const cancel = () => {
+    fn = null;
+  };
   return { call: wrapper, cancel };
 };
 
 // Mixin
 
 const cancelable2 = (fn) => {
   const wrapper = (...args) => (fn ? fn(...args) : null);
-  wrapper.cancel = () => fn = null;
+  wrapper.cancel = () => {
+    fn = null;
+  };
   return wrapper;
 };
 
@@ -22,14 +26,16 @@ const fn = (par) => {
   console.log('Function called, par:', par);
 };
 
-{ // Return struct
+{
+  // Return struct
   const f2 = cancelable1(fn);
   f2.call('first');
   f2.cancel();
   f2.call('second');
 }
 
-{ // Mixin
+{
+  // Mixin
   const f2 = cancelable2(fn);
   f2('first');
   f2.cancel();

JavaScript/b-optimzed.js

@@ -38,7 +38,7 @@ const wrap = (f) => {
       limit = count || 0;
       counter = 0;
       return this;
-    }
+    },
   };
 
   return Object.assign(wrapper, methods);