PRDV402: Practice: Making Circles Using Functions | Saylor Academy

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This practice video shows you how to create a program that makes concentric circles using functions in JavaScript. It uses a loop to keep the circles drawing. For a challenge, change the loop into a recursive call once you have it working. This exercise does not count toward your grade. It is just for practice!

Source: Pixelsplasher, https://www.youtube.com/watch?v=EE46_Q35HPU
This work is licensed under a Creative Commons Attribution 3.0 License.

Last modified: Monday, 21 August 2023, 11:56 PM

Course Introduction

Course Syllabus

Unit 1: Working with Objects in JavaScript

1.1: More on Objects in JavaScript

Review: Using JavaScript Objects

Creating Multiple Objects with Constructors

1.2: Object-Oriented JavaScript

JavaScript Class-Based Object-Oriented Programming (OOP)

Introduction to Object Prototypes

Introduction to Classes in JavaScript

Example in Action: JavaScript Object Creation

1.3: Working with Built-In Objects

Introduction to Standard Built-in Objects

What Is the Global Property Infinity?

1.4 String, Math, and Date Objects in JavaScript

How to Use Text Processing with Strings

How to Use the Number Object

Built-In Mathematical Calculations

What Is the Date Object?

Example in Action: Manipulating String Objects

Practice: Displaying the Date and Time on a Web Page

Unit 1 Assessment

Unit 1 Assessment

Unit 2: JavaScript Data Structures

2.1: Array Introduction

What Is an Array?

Different Ways to Create and Manipulate an Array

Example in Action: Learn How to Create and Manipulate Arrays

Practice: Create a Guest List with Arrays

2.2: Using Array Methods

Iterating through Arrays with forEach

Searching Arrays with indexOf and lastIndexOf

Sorting Arrays with the .sort Method

Destructuring Arrays

Example in Action: push() and pop() methods

Example in Action: Useful Array Methods in JavaScript

Practice: An Array of Grades

2.3: Introduction to Maps and Sets

What Is a Set?

What Is a Map?

Example in Action: Working with Sets

Practice: Working with Map Objects

Unit 2 Assessment

Unit 2 Assessment

Unit 3: More on Working with Functions

3.1: Comparing Types of Functions

Review: Simple Functions

Review: Function Returning a Value

Review: Anonymous Functions

How to Use Function "Constructors"

3.2: Scope and Closure

What Is Scope?

What Is Closure?

Example in Action: Function Scope

Example in Action: Function Closure

Practice: Scope, Scope Chain, and Closures

3.3: Using the "this" Keyword

What Is "this"?

Using function.call to Call a Function

Calling a Function Using function.apply

Using function.bind to Create New Functions

Examples in Action: Using "this" with Functions

Practice: Using function.call and function.apply

3.4: Nested, Recursive, and High-Order Functions

What Is a Nested Function?

Using Recursive Functions

Example in Action: Recursive Functions

Higher-Order Functions Explained

Practice: Making Circles Using Functions

Unit 3 Assessment

Unit 3 Assessment

Unit 4: DOM Interfaces and Interactive JavaScript

4.1: DOM Programming Interfaces

Node Interface

Document Interface

Element Interface

HTML Interface

EventTarget Interface

4.2: JavaScript and the DOM: Commonly Used Methods

Creating New Elements with document.createElement

The <form> element

The <input> element

The <label> element

The <select> element

Using the <button> Element

Using the <text> Element