init into git

Section 01 - Intro/first-app.js

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+const fs = require('fs');
+
+fs.writeFileSync('hello.txt', 'Hello from Node.js');

Section 01 - Intro/hello.txt

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+Hello from Node.js

Section 02 - JavaScript/syntax.js

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+/******************************************************************************
+ * VARIABLES
+ */
+
+/* Outdated syntax
+var name = 'Ken';
+var age = 57;
+var hasHobbies = true;
+*/
+
+// Using let and const for variables
+const uname = 'Ken';
+let age = 57;
+let hasHobbies = true; 
+
+/******************************************************************************
+ * FUNCTIONS
+ */
+
+// Basic structure and use of a function
+function basicSummarizeUser(userName, userAge, userHasHobbies) {
+    return ('Name is ' + userName + ', age is ' + userAge + ', and the user has hobbies: ' + userHasHobbies);
+}
+console.log(basicSummarizeUser(uname, age, hasHobbies));
+
+// A named function
+const namedSummarizeUser = function(userName, userAge, userHasHobbies) {
+    return ('Name is ' + userName + ', age is ' + userAge + ', and the user has hobbies: ' + userHasHobbies);
+}
+console.log(namedSummarizeUser(uname, age, hasHobbies));
+
+// Arrow function syntax: affects the use of 'this'
+const arrowSummarizeUser = (userName, userAge, userHasHobbies) => {
+    return ('Name is ' + userName + ', age is ' + userAge + ', and the user has hobbies: ' + userHasHobbies);
+}
+console.log(arrowSummarizeUser(uname, age, hasHobbies));
+
+// Arrow function when there is a single statement in the function
+const add = (a, b) => a + b;
+console.log(add(1, 2));
+
+/******************************************************************************
+ * OBJECTS
+ */
+
+const person = {
+    name: 'Ken',
+    age: 57,
+
+    greet() {
+        console.log(`Hi I am ${name}`);
+    }
+}
+console.log(person)
+
+/******************************************************************************
+ * ARRAYS
+ */
+const hobbies = ['Sports', 'Cooking'];
+for(let hobby of hobbies) {
+    console.log(hobby);
+}
+
+/******************************************************************************
+ * SPREAD AND REST OPERATORS
+ */
+
+// Simply copying an array
+const copiedArray = hobbies.slice();
+console.log(copiedArray);
+
+// Making a copy using SPREAD
+const copiedAgainArray = [...hobbies];
+
+// Can use SPREAD to copy objects too
+const copiedPerson = {...person}
+
+// REST bundles items together
+const toArray = (...args) => {
+    return args;
+};
+console.log(toArray(1, 2, 3, 4)); // The REST operator let's me hand in a variable number of arguments
+
+/******************************************************************************
+ * DESTRUCTURING
+ */
+
+const printName = (personData) => {
+    console.log(personData.name);
+}
+printName(person);
+
+// Alternative using destructuring
+
+const printNameD = ({name}) => {
+    console.log(name);
+}
+printNameD(person); // Still pass in the object but only the name prop is passed
+
+/******************************************************************************
+ * ASYNC CODE and PROMISES
+ */
+
+const fetchData = () => {
+    const promise = new Promise((resolve, reject) => {
+        setTimeout(() => {
+            resolve('Done');
+        }, 1500);
+    });
+    return promise;
+};
+
+setTimeout(() => {
+    console.log('Timer is done');
+    fetchData().then(text => {
+        console.log(text);
+    });
+}, 2000);
+