JavaScript OOP, API, and Regex - Quick Recap
## **1. Introduction to JavaScript Fundamentals**
### **1.1 JavaScript Basics Recap**
Before diving into Object-Oriented Programming (OOP), APIs, and Regular Expressions (Regex), it’s essential to ensure a solid understanding of core JavaScript concepts. This module provides a brief refresher on these concepts:
#### **1.1.1 Variables and Data Types**
- Variables are declared using `let`, `const`, or `var` (avoid `var` in modern code).
- Data types include:
- Primitive: `string`, `number`, `boolean`, `null`, `undefined`, `symbol`.
- Non-primitive: Objects (arrays, functions, objects).
#### **1.1.2 Functions**
- Functions are first-class objects in JavaScript.
- Can be declared in several ways:
```javascript
// Function declaration
function greet(name) {
return `Hello, ${name}!`;
}
// Function expression
const greet = function(name) {
return `Hello, ${name}!`;
};
// Arrow function (ES6)
const greet = (name) => `Hello, ${name}!`;
```
#### **1.1.3 Control Structures**
- Conditional statements: `if`, `else if`, `else`, `switch`.
- Loops: `for`, `while`, `do...while`, `for...of`, and `for...in`.
#### **1.1.4 Objects and Arrays**
- Objects are collections of key-value pairs:
```javascript
const person = {
name: "John",
age: 30,
greet() {
return `Hi, I’m ${this.name}.`;
}
};
```
- Arrays are ordered collections:
```javascript
const fruits = ["apple", "banana", "cherry"];
console.log(fruits[1]); // Output: banana
```
#### **1.1.5 DOM Manipulation Basics**
- Selecting elements:
```javascript
const button = document.querySelector("button");
```
- Updating content:
```javascript
button.textContent = "Click Me!";
```
---
### **1.2 Tools and Environment Setup**
For this course, we’ll use tools that simplify development without introducing frameworks or libraries.
#### **1.2.1 Text Editor**
- **Notepad++**:
- Download and install Notepad++ from its official website.
- Set up syntax highlighting for JavaScript.
- Use plugins like "Explorer" for navigating files easily.
#### **1.2.2 Browser Console**
- Every modern browser has developer tools:
- Open developer tools using `Ctrl+Shift+I` (Windows) or `Cmd+Option+I` (Mac).
- Go to the "Console" tab to test JavaScript code in real time.
#### **1.2.3 JavaScript Execution**
- JavaScript code can run directly in a browser or through tools like Node.js.
- Example:
1. Create an HTML file with a script tag:
```html
JavaScript Test
```
2. Open the file in a browser to see the output in the console.
#### **1.2.4 Debugging Tools**
- Use `console.log()` for debugging.
- Breakpoints:
- Set breakpoints in browser dev tools to pause code execution and inspect variables.
- Use `debugger;` in the code to programmatically set a breakpoint.
With these fundamentals covered, we’re ready to dive into the main modules: OOP, APIs, and Regex in JavaScript.
Posted by Mihigo ER Anaja
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