21 of 32 lessons

Video Lesson

Lesson Notes

Understanding Arrays in JavaScript

Arrays in JavaScript are lists that can hold any type of value, including strings, numbers, booleans, symbols, undefined, null, objects, and even other arrays.

Creating an Array

Declare an array using square brackets:

const myList = [
  "Hello world",
  12,
  43,
  true,
  undefined,
  null,
  Symbol("id"),
];
console.log(myList);

Nested Arrays

Arrays can contain other arrays, creating deeply nested structures:

const complexList = [
  [70, 66, 74.23],
  { name: "Alice" },
  [
    ["foo", "bar"],
    33,
  ],
];
console.log(complexList);

Key Points

Arrays can hold any type of value.
Arrays can be nested arbitrarily deep.
Access elements via zero-based indices (e.g., myList[0]).

What’s Next?

Arrays become more powerful when combined with loops and array methods—stay tuned for the next video on array properties and methods!

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`break` and `continue` in JavaScript Loops

Exploring Array Properties

Basic Arrays in Javascript

In this lesson, you'll learn how to create arrays that can store a variety of data types, explore the concept of nested arrays, and gain essential skills for accessing and manipulating array elements effectively.

2m 19s

Course Content

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1. Introduction & Setup

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Setting up VS Code

Creating Your First HTML Page with VS Code and AI

Creating and Linking Your First JavaScript File in VS Code

Understanding the Basic HTML Structure for JavaScript Integration

2. Variables, Data Types, Operators

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Variables using the "var" keyword

Variables with "const" and "let" keywords

Code comments

String Interpolation (Template Literals)

Block Scope

Primitives in Javascript

Javascript "null" vs "undefined"

Equality Operators in JavaScript

Greater Than and Less Than in JavaScript

3. Control Structures ("If", "Else" statements and loops)

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Conditional Logic: `if`, `else if`, and `else`

Switch Statements

Basic For Loop

While Loop: Basics

`do...while` Loop Explained

Nested Loops in JavaScript

`break` and `continue` in JavaScript Loops

4. Arrays, Objects and Iterables

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Basic Arrays in Javascript

Exploring Array Properties

Array Indexing, Access Elements

Array Iteration with JavaScript For Loops

Array Iteration: Using `for...of` in JavaScript

Basic Objects in JavaScript (Simple)

Basic This

5. Functions

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Basic functions

Return values from functions

Function Expressions

Arrow functions

"this" keyword in arrow functions

6. Promises, Async and Await

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7. The DOM

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