Introduction to JavaScript

Introduction to JavaScript

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1. Basic Concepts

Our first section will introduce you to JavaScript and explore its syntax. This initial step will give you a fundamental understanding of JavaScript's syntax, setting the stage for more in-depth learning in subsequent sections.

About JavaScript

Challenge: Console Output

Challenge: Single-line Comment

Challenge: Multi-line Comment

2. Variables and Data Types

We'll dive into the essential data types that JavaScript operates with. We'll begin by distinguishing between literals and variables and then explore the diverse range of data types used in JavaScript. This knowledge will form a solid foundation for your journey into JavaScript.

Challenge: Defining the Variable

Data Types Overview

Challenge: Array Operations

3. Basic Operations

We're acquainted with the various data types. It's time to roll up our sleeves and learn how to manipulate them. In this third section, we'll explore the operations that can be performed with each data type, equipping you with practical skills to work effectively with JavaScript's data structures.

Mathematical Operations

Operations with Assignment

Increment and Decrement

Challenge: Variable Operations

Comparison Operations

Logical Operations

Challenge: Comparing Variables

String Concatenation

Challenge: Sentence Building

4. Conditional Statements

Delve into the art of controlling the flow of execution in JavaScript. It's a powerful skill that enables us to instruct the interpreter precisely on how to behave under various conditions. You'll gain the ability to orchestrate your code's behavior.

if

Challenge: Determining Size

5. Loops

Uncover the code optimization through the use of loops. Loops allow us to streamline our code by performing repetitive actions efficiently. We'll delve into JavaScript's different types of loops and discover how to wield their power effectively.

Challenge: Printing Numbers from 5 to 9

Challenge: Tigers

Challenge: Stopping and Skipping

6. Functions

Unlock the potential of functions as essential tools for crafting simple yet powerful programs. You'll master creating and utilizing functions, empowering you to simplify your coding endeavors and enhance your problem-solving skills.

What is a Function?

Challenge: My Name

Course Content

Introduction to JavaScript

Introduction to JavaScript

if

Conditions in JavaScript provide control over the execution flow. While the interpreter executes commands in order, programmers often need to alter this flow based on specific conditions. To achieve this, JavaScript offers two keywords: if and else.

if Statements

The if keyword allows you to open a code block that will be executed if the given condition is true:


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if (true) {
  console.log("It's TRUE!");
}

if (false) {
  console.log("It's FALSE!");
}

In the above example, the if statement executes code only when the condition is true. The syntax of an if statement is straightforward: it begins with the if keyword, followed by the condition enclosed in parentheses (), and a code block enclosed in curly braces {}.

The opening curly brace { denotes the start of the code block, and the closing curly brace } marks its end.

An expression, as well as a value, can be considered as a condition.


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let a = 935;

if (a > 17) {
  console.log("The variable is greater than 17");
}

if (a > 235124) {
  console.log("The variable is greater than 235124");
}

if (a > 0) {
  console.log("The variable is greater than 0");
}

if (a < 0) {
  console.log("The variable is less than 0");
}

In the example above, when a = 935, there are four conditions:

Condition	Condition result	Code has been executed?
`a > 17`	`true`	Yes
`a > 235124`	`false`	No
`a > 0`	`true`	Yes
`a < 0`	`false`	No

You are not limited to performing operations solely inside the code block:


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let a = 5;
let b = 3;
let c;

if (a > 0 && b > 0) {
  c = a - b;
  console.log("c =", c);
}

if (a > 2 && b > 2) {
  c = a + b;
  console.log("c =", c);
}

console.log(a, b, c);

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Section 4. Chapter 1

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