Introduction to JavaScript Quick Guide

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Introduction to JavaScript

JavaScript

Learn how to program with JavaScript. After reading this guide, you will know how to create a program in JavaScript, how to define functions and objects, and how to read and modify an HTML document dynamically.

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Description

Quick Guides for Masterminds are excerpts from our best-selling books SwiftUI for Masterminds, UIKit for Masterminds, and HTML5 for Masterminds, providing a cost-effective alternative to getting the information you need.

With this guide, you will learn how to program with JavaScript. After reading this guide, you will know how to create a program in JavaScript, how to define functions and objects, and how to read and modify an HTML document dynamically.

Table of Contents

JAVASCRIPT

Introduction to JavaScript

Implementing JavaScript

Variables

Strings

Booleans

Arrays

Conditionals and Loops

Control Transfer Instructions

Functions

Declaring Functions

Scope

Anonymous Functions

Standard Functions

Objects

Declaring Objects

Methods

The this Keyword

Constructors

The new Operator

Inheritance

Standard Objects

String Objects

Array Objects

Date Objects

Math Object

Window Object

Document Object

Element Objects

Creating Element Objects

Events

The addEventListener() Method

Event Objects

Debugging

Console

Console Object

Error Event

Exceptions

APIs

Native Libraries

External Libraries

QUICK REFERENCE

Event Attributes

Instructions

Constructors

Strings

Arrays

Dates

Properties

Functions

Window Object

Document Object

Element Object

Events

Errors

Examples

Download TXT Files

Listing 1: Defining inline JavaScript

Listing 2: Implementing multiple event attributes

Listing 3: Responding to the load event

Listing 4: Embedding JavaScript in the document

Listing 5: Introducing JavaScript code from an external file

Listing 6: Creating a JavaScript file (mycode.js)

Listing 7: Declaring a variable in JavaScript

Listing 8: Using the content of a variable

Listing 9: Assigning a new value to a variable

Listing 10: Assigning the value of a variable to another variable

Listing 11: Performing an operation with the value stored in a variable

Listing 12: Performing complex operations

Listing 13: Controlling precedence in the operation

Listing 14: Incrementing the value of a variable

Listing 15: Incrementing the value of a variable by a specific value

Listing 16: Calculating the remainder

Listing 17: Determining the parity of a number

Listing 18: Assigning a string of characters to a variable

Listing 19: Concatenating text

Listing 20: Adding text at the beginning of the value

Listing 21: Concatenating strings and numbers

Listing 22: Concatenating numbers

Listing 23: Escaping characters

Listing 24: Generating new lines

Listing 25: Declaring a Boolean variable

Listing 26: Creating arrays

Listing 27: Displaying the array's values

Listing 28: Using different types of values

Listing 29: Declaring a value as undefined

Listing 30: Declaring a null value

Listing 31: Working with values in arrays

Listing 32: Defining multidimensional arrays

Listing 33: Accessing multidimensional arrays

Listing 34: Assigning an empty array as the value of another array

Listing 35: Assigning an empty array to a variable

Listing 36: Checking a condition with if

Listing 37: Inverting the result of the condition

Listing 38: Checking multiple conditions with logical operators

Listing 39: Using Boolean values as conditions

Listing 40: Using integer numbers to set a condition

Listing 41: Using strings to set a condition

Listing 42: Checking two conditions with if else

Listing 43: Checking a value with the switch instruction

Listing 44: Creating a loop with the for instruction

Listing 45: Iterating over the values of an array

Listing 46: Using the while instruction

Listing 47: Using the do while instruction

Listing 48: Jumping to the next cycle of the loop

Listing 49: Interrupting the loop

Listing 50: Declaring and executing functions

Listing 51: Processing data with functions

Listing 52: Declaring global and local variables

Listing 53: Declaring two variables with the same name

Listing 54: Sending a value to a function

Listing 55: Calling the function with different values

Listing 56: Sending the value of a variable to a function

Listing 57: Sending multiple values to a function

Listing 58: Returning values from functions

Listing 59: Returning different values from a function

Listing 60: Declaring anonymous functions

Listing 61: Executing anonymous functions

Listing 62: Checking whether a value is a number or not

Listing 63: Converting a string into a number

Listing 64: Encoding a string to include it in a URL

Listing 65: Creating objects

Listing 66: Accessing properties

Listing 67: Accessing properties using variables

Listing 68: Accessing properties with invalid names

Listing 69: Updating values and adding new properties to the object

Listing 70: Creating objects inside objects

Listing 71: Declaring and executing methods

Listing 72: Returning values from methods

Listing 73: Referencing the object's properties with the this keyword

Listing 74: Using a constructor to create an object

Listing 75: Sending initial values to a constructor

Listing 76: Using constructors to create multiple objects

Listing 77: Defining private properties

Listing 78: Creating objects with the new operator

Listing 79: Defining initial values for the object

Listing 80: Creating objects from other objects

Listing 81: Adding a new method to the prototype

Listing 82: Testing the prototype chain

Listing 83: Creating numbers with a constructor

Listing 84: Creating numbers from strings

Listing 85: Performing arithmetic operations with objects

Listing 86: Creating an array with a constructor

Listing 87: Creating an empty array with a constructor

Listing 88: Counting the number of characters in a string

Listing 89: Iterating through the characters of a string

Listing 90: Removing space characters

Listing 91: Processing a string

Listing 92: Converting a string to uppercase

Listing 93: Copying a set of characters

Listing 94: Copying all the characters from a specific index to the end of the string

Listing 95: Referencing characters with negative indexes

Listing 96: Copying characters between two indexes

Listing 97: Getting words from a string

Listing 98: Searching for a string at the beginning of another string

Listing 99: Searching for a string inside another string

Listing 100: Finding the location of a string inside another string

Listing 101: Replacing a string with another string

Listing 102: Getting the number of values in the array

Listing 103: Iterating through the array

Listing 104: Creating an array from the values of another array

Listing 105: Filtering the values of an array

Listing 106: Returning a condition to filter the elements

Listing 107: Checking the values of an array

Listing 108: Creating a string with the values of an array

Listing 109: Getting the index of a value in an array

Listing 110: Searching for multiple values in an array

Listing 111: Adding values to an array

Listing 112: Adding multiple values to an array

Listing 113: Concatenating two arrays

Listing 114: Removing values from an array

Listing 115: Removing values from an array

Listing 116: Adding values to an array in a specific position

Listing 117: Sorting the values of an array in reverse order

Listing 118: Sorting the values in alphabetical order

Listing 119: Sorting the values in numerical order

Listing 120: Processing the values and storing the results

Listing 121: Creating a Date object

Listing 122: Creating a Date object from a string

Listing 123: Creating a Date object from date components

Listing 124: Reading the components of a date

Listing 125: Reading the month

Listing 126: Incrementing a date

Listing 127: Calculating an interval

Listing 128: Calculating an interval in seconds

Listing 129: Calculating an interval in days

Listing 130: Comparing two dates

Listing 131: Comparing only the date without the time

Listing 132: Performing arithmetic operations with the Math object

Listing 133: Getting a random number

Listing 134: Defining a new location

Listing 135: Refreshing the page

Listing 136: Opening a new window

Listing 137: Using timers to execute functions

Listing 138: Cancelling a timer

Listing 139: Getting a reference to the Element object that represents an element

Listing 140: Reading the element's attributes from JavaScript

Listing 141: Accessing elements by keyword

Listing 142: Accessing an element by keyword

Listing 143: Finding an element with the querySelector() method

Listing 144: Searching for an element inside another element

Listing 145: Assigning new styles to an element

Listing 146: Reading CSS styles from JavaScript

Listing 147: Replacing the element's class

Listing 148: Turning classes on and off

Listing 149: Turning classes on and off with the toggle() method

Listing 150: Assigning content to an element

Listing 151: Modifying the content of an element

Listing 152: Inserting HTML code into the document

Listing 153: Adding HTML code inside an element

Listing 154: Creating Element objects

Listing 155: Adding content to an Element object

Listing 156: Defining event attributes from JavaScript code

Listing 157: Listening to events with the addEventListener() method

Listing 158: Using Event objects

Listing 159: Responding to an event with an anonymous function

Listing 160: Passing values to a listener

Listing 161: Passing values to a listener with anonymous functions

Listing 162: Reporting the position of the mouse

Listing 163: Calculating the position of the mouse on an element

Listing 164: Detecting the key pressed

Listing 165: Detecting special keys

Listing 166: Generating an error

Listing 167: Displaying messages on the console with the log() method

Listing 168: Responding to errors

Listing 169: Throwing exceptions

Listing 170: Detecting features with Modernizr

Links

JavaScript References and Tutorials

Standard Objects

Document Object

Location Object

Event References

JavaScript Scopes Tutorial

Inheritance and the Prototype Chain

JavaScript External Libraries

Resources

No Resources Available for this Guide

TABLE OF CONTENTS

Books

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