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Spis treści

Head First JavaScript Programming. A Brain-Friendly Guide eBook -- spis treści

• Head First JavaScript Programming
• Dedication
• Praise for Head First JavaScript Programming
• Praise for other books by Eric T. Freeman and Elisabeth Robson
• Authors of Head First JavaScript Programming
• How to Use This Book: Intro
  • Who is this book for?
    • Who should probably back away from this book?
  • We know what youre thinking.
    • And we know what your brain is thinking.
  • Metacognition: thinking about thinking
  • Heres what WE did:
  • Heres what YOU can do to bend your brain into submission
  • Read Me
  • Tech Reviewers
  • Acknowledgments
• 1. A Quick Dip into Javascript: Getting your feet wet
  • The way JavaScript works
  • How youre going to write JavaScript
  • How to get JavaScript into your page
    • A little test drive
  • JavaScript, youve come a long way baby...
    • Its True.
  • How to make a statement
  • Variables and values
  • Back away from that keyboard!
  • Express yourself
  • Doing things more than once
  • How the while loop works
  • Making decisions with JavaScript
  • And, when you need to make LOTS of decisions
  • Reach out and communicate with your user
    • Create an alert.
    • Write directly into your document.
    • Use the console.
    • Directly manipulate your document.
  • A closer look at console.log
  • Opening the console
  • Coding a Serious JavaScript Application
  • How do I add code to my page? (let me count the ways)
  • Were going to have to separate you two
• 2. Writing Real Code: Going further
  • Lets build a Battleship game
  • Our first attempt...
  • First, a high-level design
  • A few more details...
    • Representing the ships
    • Getting user input
    • Displaying the results
  • Working through the Pseudocode
  • Oh, before we go any further, dont forget the HTML!
  • Writing the Simple Battleship code
  • Now lets write the game logic
  • Step One: setting up the loop, getting some input
  • How prompt works
  • Checking the users guess
  • So, do we have a hit?
  • Adding the hit detection code
  • Hey, you sank my battleship!
  • Provide some post-game analysis
  • And that completes the logic!
  • Doing a little Quality Assurance
  • Can we talk about your verbosity...
  • Finishing the Simple Battleship game
  • How to assign random locations
  • The world-famous recipe for generating a random number
  • Back to do a little more QA
  • Congrats on your first true JavaScript program, and a short word about reusing code
• 3. Introducing Functions: Getting functional
  • Whats wrong with the code anyway?
  • By the way, did we happen to mention FUNCTIONS?
  • Okay, but how does it actually work?
  • What can you pass to a function?
  • JavaScript is pass-by-value.
    • That means pass-by-copy.
  • Weird Functions
    • EXPERIMENT #1: what happens when we dont pass enough arguments?
    • EXPERIMENT #2: what happens when we pass too many argments?
    • EXPERIMENT #3: what happens when we have NO parameters?
  • Functions can return things too
  • Tracing through a function with a return statement
  • Global and local variables
    • Know the difference or risk humiliation
  • Knowing the scope of your local and global variables
  • The short lives of variables
  • Dont forget to declare your locals!
• 4. Putting Some Order in Your Data: Arrays
  • Can you help Bubbles-R-Us?
  • How to represent multiple values in JavaScript
  • How arrays work
    • How to create an array
  • How to access an array item
  • Updating a value in the array
  • How big is that array anyway?
  • The Phrase-O-Matic
  • Meanwhile, back at Bubbles-R-Us...
    • Cubicle Conversation
  • How to iterate over an array
  • But wait, theres a better way to iterate over an array
    • Test drive the bubble report
  • Its that time again.... Can we talk about your verbosity?
  • Redoing the for loop with the post-increment operator
  • Quick test drive
    • Cubicle Conversation Continued...
  • Creating an array from scratch (and adding to it)
    • Test drive the final report
  • And the winners are...
  • A quick survey of the code...
  • Writing the printAndGetHighScore function
  • Refactoring the code using printAndGetHighScore
  • Putting it all together...
• 5. Understanding Objects: A trip to Objectville
  • Did someone say Objects?!
  • Thinking about properties...
  • How to create an object
  • What is Object-Oriented Anyway?
  • How properties work
  • How does a variable hold an object? Inquiring minds want to know...
  • Comparing primitives and objects
    • Initializing a primitive variable
    • Initializing an object (a reference) variable
  • Doing even more with objects...
    • Doing some pre-qualification
    • Does the taxi cut it?
  • Stepping through pre-qualification
  • Lets talk a little more about passing objects to functions
    • Putting Fido on a diet....
    • The Auto-O-Matic
  • Oh Behave! Or, how to add behavior to your objects
  • Improving the drive method
    • Take the fiat for a test drive
    • Uh oh, not so fast...
  • Why doesnt the drive method know about the started property?
    • A test drive with this
  • How this works
  • How behavior affects state... Adding some Gas-o-line
  • Now lets affect the behavior with the state
    • Gas up for a test drive
  • Congrats on your first objects!
  • Guess what? There are objects all around you! (and theyll make your life easier)
• 6. Interacting with Your Web Page: Getting to know the DOM
  • In our last chapter, we left you with a little challenge. The crack the code challenge.
  • So what does the code do?
    • A quick recap
  • How JavaScript really interacts with your page
  • How to bake your very own DOM
  • A first taste of the DOM
  • Getting an element with getElementById
  • What, exactly, am I getting from the DOM?
  • Finding your inner HTML
  • What happens when you change the DOM
  • A test drive around the planets
  • Dont even think about running my code until the page is fully loaded!
    • Lets try that again...
  • You say event hander, I say callback
    • Why stop now? Lets take it further
  • How to set an attribute with setAttribute
  • More fun with attributes! (you can GET attributes too)
    • What happens if my attribute doesnt exist in the element?
    • Meanwhile, back at the solar system...
    • Test driving the planets one last time...
  • So what else is a DOM good for anyway?
• 7. Types, Equality, Conversion and All That Jazz: Serious types
  • The truth is out there...
  • Watch out, you might bump into undefined when you arent expecting it...
  • How to use null
  • Dealing with NaN
  • It gets even weirder
  • We have a confession to make
  • Understanding the equality operator (otherwise known as ==)
    • If the two values have the same type, just compare them
    • If the two values have different types, try to convert them into the same type and then compare them
  • How equality converts its operands (sounds more dangerous than it actually is)
    • CASE#1: Comparing a number and a string.
    • CASE#2: Comparing a boolean with any other type.
    • CASE#3: Comparing null and undefined.
    • CASE#4: Oh, actually there is no case #4.
  • How to get strict with equality
    • Two values are strictly equal only if they have the same type and the same value.
  • Even more type conversions...
    • Another look at concatenation, and addition
    • What about the other arithmetic operators?
  • How to determine if two objects are equal
    • When we test equality of two object variables, we compare the references to those objects
    • Two references are equal only if they reference the same object
  • The truthy is out there...
  • What JavaScript considers falsey
  • The Secret Life of Strings
  • How a string can look like a primitive and an object
  • A five-minute tour of string methods (and properties)
  • Chair Wars (or How Really Knowing Types Can Change Your Life)
    • In Larrys cube
    • In Brads cube
    • But wait! Theres been a spec change
    • Back in Larrys cube
    • At Brads laptop at the beach
    • Larry snuck in just ahead of Brad.
    • The suspense is killing me. Who got the chair?
• 8. Bringing it All Together: Building an app
  • This time, lets build a REAL Battleship game
  • Stepping back... to HTML and CSS
  • Creating the HTML page: the Big Picture
    • Step 1: The Basic HTML
    • Step 2: Creating the table
    • Step 3: Player interaction
  • Adding some more style
    • Step 4: Placing the hits and misses
  • Using the hit and miss classes
  • How to design the game
  • Implementing the View
  • How displayMessage works
    • Implementing displayMessage
  • How displayHit and displayMiss work
    • Implementing displayHit and displayMiss
    • Another Test Drive...
  • The Model
    • How the model interacts with the view
    • Youre gonna need a bigger boat... and game board
  • How were going to represent the ships
  • Implementing the model object
    • Thinking about the fire method
  • Setting up the fire method
    • Looking for hits
    • Putting that all together...
    • Wait, can we talk about your verbosity again?
    • Meanwhile back at the battleship...
    • A view to a kill...
  • Implementing the Controller
  • Processing the players guess
  • Planning the code...
  • Implementing parseGuess
    • Meanwhile back at the controller...
  • Counting guesses and firing the shot
    • Game over?
    • Getting a players guess
  • How to add an event handler to the Fire! button
    • Getting the players guess from the form
  • Passing the input to the controller
    • Whats left? Oh yeah, darn it, those hardcoded ships!
  • How to place ships
    • The generateShipLocations function
  • Writing the generateShip method
  • Generate the starting location for the new ship
  • Completing the generateShip method
    • Avoiding a collision!
    • Two final changes
    • Congrats, Its Startup Time!
• 9. Asynchronous Coding: Handling events
  • What are events?
  • Whats an event handler?
  • How to create your first event handler
  • Test drive your event
  • Getting your head around events... by creating a game
  • Implementing the game
    • Step 1: access the image in the DOM
    • Step 2: add the handler, and update the image
  • Test drive
  • Lets add some more images
  • Now we need to assign the same event handler to each images onclick property
  • How to reuse the same handler for all the images
    • Assigning the click handler to all images on the page
  • How the event object works
  • Putting the event object to work
  • Test drive the event object and target
  • Events and queues
  • Even more events
    • Test drive your timer
  • How setTimeout works
  • Finishing the image game
  • Test driving the timer
• 10. First Class Functions: Liberated functions
  • The mysterious double life of the function keyword
  • Function declarations versus function expressions
  • Parsing the function declaration
  • Whats next? The browser executes the code
  • Moving on... The conditional
    • And finishing up...
  • How functions are values too
  • Did we mention functions have First Class status in JavaScript?
  • Flying First Class
  • Writing code to process and check passengers
  • Iterating through the passengers
  • Passing a function to a function
    • Test drive flight
  • Returning functions from functions
  • Writing the flight attendant drink order code
  • The flight attendant drink order code: a different approach
    • Wait, we need more drinks!
  • Taking orders with first class functions
    • Test drive flight
  • Webville Cola
  • How the array sort method works
  • Putting it all together
    • Meanwhile back at Webville Cola
  • Take sorting for a test drive
• 11. Anonymous Functions, Scope and Closures: Serious functions
  • Taking a look at the other side of functions...
  • How to use an anonymous function
  • We need to talk about your verbosity, again
  • When is a function defined? It depends...
  • What just happened? Why wasnt fly defined?
  • How to nest functions
  • How nesting affects scope
  • A little review of lexical scope
  • Where things get interesting with lexical scope
  • Functions Revisited
  • Calling a function (revisited)
  • What the heck is a closure?
  • Closing a function
  • Using closures to implement a magic counter
    • Test drive your magic counter
  • Looking behind the curtain...
  • Creating a closure by passing a function expression as an argument
  • The closure contains the actual environment, not a copy
  • Creating a closure with an event handler
    • Click me! without a closure
    • Click me! with a closure
    • Test drive your button counter
  • How the Click me! closure works
• 12. Advanced Object Construction: Creating objects
  • Creating objects with object literals
  • Using conventions for objects
  • Introducing Object Constructors
  • How to create a Constructor
  • How to use a Constructor
  • How constructors work
  • You can put methods into constructors as well
    • Take the bark method for a quick test drive
  • Its Production Time!
  • Lets test drive some new cars
  • Dont count out object literals just yet
  • Rewiring the arguments as an object literal
  • Reworking the Car constructor
  • Understanding Object Instances
  • Even constructed objects can have their own independent properties
  • Real World Constructors
  • The Array object
  • Even more fun with built-in objects
• 13. Using Prototypes: Extra strength objects
  • Hey, before we get started, weve got a better way to diagram our objects
  • Revisiting object constructors: were reusing code, but are we being efficient?
  • Is duplicating methods really a problem?
  • What are prototypes?
  • Inheriting from a prototype
  • How inheritance works
  • Overriding the prototype
    • So where do you get a prototype?
  • How to set up the prototype
    • Test drive the prototype with some dogs
    • Give Spot his WOOF! in code
    • Test drive the custom bark method
    • Teaching a new trick
  • Prototypes are dynamic
  • A more interesting implementation of the sit method
    • Test drive the new sit method
  • One more time: how the sitting property works
  • How to approach the design of the show dogs
  • Setting up a chain of prototypes
  • How inheritance works in a prototype chain
  • Creating the show dog prototype
    • First, we need an object that inherits from the dog prototype
    • Next, turning our dog instance into a show dog prototype
    • Now its time to fill in the prototype
  • Creating a show dog instance
    • Test drive the show dog
    • Examining the exercise results
  • A final cleanup of show dogs
    • A little more cleanup
  • Stepping through Dog.call
    • The final test drive
  • The chain doesnt end at dog
    • What is Object?
    • Object as a prototype
  • Using inheritance to your advantage... by overriding built-in behavior
  • Using inheritance to your advantage... by extending a built-in object
    • Test driving the cliché machine
  • Grand Unified Theory of
  • Better living through objects
  • Putting it all together
  • Whats next?
• A. Leftovers: The top ten topics (we didnt cover)
  • #1 jQuery
  • #2 Doing more with the DOM
  • #3 The Window Object
  • #4 Arguments
  • #5 Handling exceptions
    • Try/catch
  • #6 Adding event handlers with addEventListener
    • Event handling in IE8 and older
  • #7 Regular Expressions
    • The RegExp constructor
    • Using a RegExp object
  • #8 Recursion
  • #9 JSON
  • #10 Server-side JavaScript
• Index
• About the Authors
• Colophon
• Copyright