Upload code from "Modern Javascript" module

4-modern-js/1-vars.js

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+{
+  // Block Scope
+  {
+    // Nested Block Scope
+  }
+}
+
+if (true) {
+  // Block Scope
+}
+
+for (var i = 1; i <= 10; i++) {
+  // Block Scope
+}
+
+function sum(a, b) {
+  // Function Scope
+  var result = a + b;
+}
+
+sum(4 + 3);

4-modern-js/10-template-strings.js

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+const greeting = "Hello World";
+
+const answer = 'Forty Two';
+
+const html = `
+  <div>
+    ${Math.random()}
+  </div>
+`;

4-modern-js/11-classes.js

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+class Person {
+  constructor(name) {
+    this.name = name;
+  }
+  greet() {
+    console.log(`Hello ${this.name}!`);
+  }
+}
+
+class Student extends Person {
+  constructor(name, level) {
+    super(name);
+    this.level = level;
+  }
+  greet() {
+    console.log(`Hello ${this.name} from ${this.level}`);
+  }
+}
+
+const o1 = new Person("Max");
+const o2 = new Student("Tina", "1st Grade");
+const o3 = new Student("Mary", "2nd Grade");
+
+o3.greet = () => console.log('I am special!');
+
+o1.greet();
+o2.greet();
+o3.greet();

4-modern-js/12-async-await.js

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+const https = require('https');
+
+function fetch (url) {
+  return new Promise((resolve, reject) => {
+    https.get(url, (res) => {
+      let data = '';
+      res.on('data', (rd) => data = data + rd);
+      res.on('end', () => resolve(data));
+      res.on('error', reject);
+    });
+  });
+}
+
+fetch('https://www.javascript.com/')
+  .then(data => {
+    console.log(data.length);
+  });
+
+  (async function read() {
+    const data = await fetch('https://www.javascript.com/');
+
+    console.log(data.length);
+  })();

4-modern-js/2-const.js

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+// Scalar values
+const answer = 42;
+const greeting = 'Hello';
+
+// Arrays and Objects
+const numbers = [2, 4, 6];
+const person = {
+  firstName: 'John',
+  lastName: 'Doe',
+};

4-modern-js/3-why-const.js

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+const answer = 42;
+
+/*
+
+A big program here...
+
+*/
+
+answer // is still 42;
+
+
+
+// vs
+
+
+
+let answer = 42;
+
+/*
+
+A big program here...
+
+*/
+
+answer // might have changed;

4-modern-js/4-functions.js

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+const X = function () {
+  // "this" here is the caller of X
+};
+
+const Y = () => {
+  // "this" here is NOT the caller of Y
+
+  // It's the same "this" found in Y's scope
+};

4-modern-js/5-this.js

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+// "this" here is "exports"
+
+this.id = 'exports';
+
+const testerObj = {
+  func1: function () {
+    console.log('func1', this);
+  },
+
+  func2: () => {
+    console.log('func2', this);
+  },
+};
+
+testerObj.func1();
+testerObj.func2();

4-modern-js/6-arrow-functions.js

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+const square = (a) => {
+  return a * a;
+};
+
+// const square = (a) => a * a;
+// const square = a => a * a;
+
+[1, 2, 3, 4].map(a => a * a);

4-modern-js/7-objects.js

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+const obj = {
+  p1: 10,
+  p2: 20,
+  f1() {},
+  f2: () => {},
+};

4-modern-js/8-destructuring.js

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+// const PI = Math.PI;
+// const E = Math.E;
+// const SQRT2 = Math.SQRT2;
+
+const { PI, E, SQRT2 }  = Math;
+
+// With require
+// const { readFile } = require('fs');
+
+
+// const circle = {
+//   label: 'circleX',
+//   radius: 2,
+// };
+//
+// const circleArea = ({ radius }) =>
+//   (PI * radius * radius).toFixed(2);
+//
+// console.log(
+//   circleArea(circle)
+// );

4-modern-js/9-rest-spread.js

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+const [first, ...restOfItems] = [10, 20, 30, 40];
+
+const data = {
+  temp1: '001',
+  temp2: '002',
+  firstName: 'John',
+  lastName: 'Doe',
+};
+
+const { temp1, temp2, ...person } = data;
+
+const newArray = [...restOfItems];
+
+const newObject = {
+  ...person,
+};