Improve examples

Author: tshemsedinov

JavaScript/1-callback.js

@@ -1,7 +1,10 @@
 'use strict';
 
 const add = (a, b) => a + b;
-const sum = (a, b, callback) => callback(a + b);
+const res = add(2, 3);
+console.log(`add(2, 3) = ${res}`);
 
-console.log('add(5, 2) =', add(5, 2));
-sum(5, 2, console.log.bind(null, 'sum(5, 2) ='));
+const sum = (a, b, callback) => callback(a + b);
+sum(2, 3, (res) => {
+  console.log(`sum(2, 3) = ${res}`);
+});

JavaScript/6-listener.js

@@ -9,7 +9,7 @@ const iterate = (array, listener) => {
 const cities = ['Kiev', 'London', 'Beijing'];
 
 const print = (city) => {
-  console.log('City:', city);
+  console.log({ city });
 };
 
 iterate(cities, print);

JavaScript/7-listener-timer.js

@@ -11,6 +11,6 @@ const iterate = (array, listener) => {
 
 const cities = ['Kiev', 'London', 'Beijing'];
 
-const print = (city) => console.log('Next city:', city);
+const print = (city) => console.log(`Next city: ${city}`);
 
 iterate(cities, print);

JavaScript/8-event.js

@@ -18,7 +18,7 @@ const adder = (initial) => {
 // Usage
 
 const maxReached = (value) => {
-  console.log('max value reached, value: ' + value);
+  console.log(`Max value reached, value: ${value}`);
 };
 
 const a1 = adder(10).max(100, maxReached)(-12);

JavaScript/9-event-emitter.js

@@ -5,7 +5,7 @@ const { EventEmitter } = require('node:events');
 const emitter = new EventEmitter();
 
 emitter.on('new city', (city) => {
-  console.log('Emitted city:', city);
+  console.log(`Emitted city: ${city}`);
 });
 
 emitter.on('data', (array) => {

JavaScript/b-errors.js

@@ -27,7 +27,7 @@ const adder = (value) => {
 // error-first
 const maxReached = (err, value) => {
   if (err) throw err;
-  console.log('value:', value);
+  console.log({ value });
 };
 
 try {