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Spis treści

Head First JavaScript Programming. 2nd Edition eBook -- spis treści

• Other OReilly books by Eric T. Freeman and Elisabeth Robson
• Table of Contents (the real thing)
• How to use this book Intro
  • Who is this book for?
    • Who should probably back away from this book?
  • We know what youre thinking
  • 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 for the first edition
  • Acknowledgments for the second edition
• 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...
  • How to make a statement
  • Variables and values
  • Constants, another kind of variable
  • 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
  • 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...
    • ...a simplified Battleship
  • First, a high-level design
  • A few more details...
    • Representing the ships
    • Getting user input
    • Displaying the results
    • Sample game interaction
  • 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 1: Setting up the loop, getting some input
  • How prompt works
  • Step 2: Checking the users guess
  • So, do we have a hit?
  • Adding the hit detection code
  • Step 3: Hey, you sank my battleship!
  • Step 4: 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 recipe for generating a random number
  • 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?
    • Variables (and constants)
  • JavaScript is pass-by-value
    • (that means pass-by-copy)
  • Weird Functions
  • 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
  • Theres more to the story
    • Any block can act as the scope of a variable
  • Dont forget to declare your locals!
  • The short lives of variables
  • The Thing-A-Ma-Jig
  • The Thing-A-Ma-Jig
• 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
  • Another 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 (reference) variable
  • Doing even more with objects
  • Doing some prequalification
  • Does the taxi cut it?
  • Stepping through prequalification
  • Lets talk a little more about passing objects to functions
  • Putting Fido on a diet
  • The Auto-O-Matic
    • 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
  • Method shorthand
  • 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)
  • Crack the Code Challenge
• 6. Interacting with your web page: Getting to know the DOM
  • In the 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 handler, 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)
  • 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
  • How template literals work
  • A five-minute tour of string properties and methods
  • String Soup
  • Chair Wars
    • (or How Really Knowing Types Can Change Your Life)
    • In Brads cube
    • In Brads cube
    • But wait! Theres been a spec change.
    • Back in Larrys cube
    • At the beach with Brad
    • 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
  • Designing the game
  • Implementing the view
  • How displayMessage works
  • Implementing displayMessage
  • How displayHit and displayMiss work
  • Implementing displayHit and displayMiss
  • 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 it 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
  • Adding 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
  • Generating the starting location for the new ship
  • Completing the generateShip method
  • Avoiding a collision!
  • Two final changes
  • Congrats, its startup time!
• 9. Handling Events: Getting asynchronous
  • What are events?
  • Whats an event handler?
  • Creating an event handler
  • 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
  • Cubicle Conversation
  • 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
  • Event Soup
• 10. Anonymous and Higher-Order Functions: Liberated functions
  • The mysterious double life of the function keyword
  • How functions are values too
  • If functions are values, we can assign them to variables
  • Did we mention functions have first class status in JavaScript?
  • Taking a look at the other side of functions...
  • How to use an anonymous function
  • We need to talk about your verbosity, again
  • We can make the code even shorter with arrow functions
  • Creating arrow functions
  • Webville Cola
  • Understanding the array sort method
  • Putting it all together
  • Meanwhile, back at Webville Cola
  • Introducing higher-order functions
  • Filtering with higher-order functions
  • Dont forget your anonymous and arrow functions
    • How to get cases sold with map
    • Get the total cases sold with reduce
  • Using reduce to get the total cases sold
  • Chaining map, filter, and reduce
  • Iterating with forEach
• 11. Modern Syntax, Lexical Scope, and Closures: Serious functions
  • Getting serious about functional syntax
    • Streamlining code with default parameters
  • Spreading out your arguments
  • Theres something we havent told you about functions...
  • Function declarations are hoisted
  • Weve done the function declarations; now we do everything else
  • We need to talk about scope
  • Taking functions beyond global scope
  • A lexical scope refresher
  • Another look at our outer/inner functions
  • Using scope for encapsulation
  • Two important JavaScript scope rules
  • Lets make another change to our code
  • Solving the mystery
  • How to make a closure
  • Stepping through createGreeting
  • Using closures to implement a magic counter
  • Test drive your magic counter
  • Looking behind the curtain...
  • Implementing a counter with a closure
  • How makeTimer works
  • Implementing onlyOnceMaker
• 12. Advanced Object Construction: Creating objects
  • Creating objects with object literals
  • Using conventions for objects
  • Introducing classes
  • How to define a class
  • How to create an object from a class
  • How classes work
  • Lets add some methods
  • Its production time!
  • The basic Car class
  • Implementing the Taxi class with extends
  • Adding new methods to the Taxi class
  • Implementing the RocketCar class
    • Overriding Cars drive method
  • Finishing up the RocketCar class
    • Whats happening here?
  • Using an object literal to clean up our constructor
  • Creating the object literal for the cadi parameters
  • Reworking the Car constructor
  • Accessor properties
  • Using getters
  • Whats a getter without a setter?
  • Static properties and methods
  • Counting our car production
• A. Leftovers: The top ten topics (we didnt cover)
  • #1 Modules
  • #2 JSON
  • #3 Promises
  • #4 Destructuring assignment
  • #5 Symbols and BigInt
  • #6 Map and Set
  • #7 Doing more with the DOM
  • #8 The window object
  • #9 Server-side JavaScript
  • #10 Recursion
• Index