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Spis treści

JavaScript Enlightenment. From Library User to JavaScript Developer eBook -- spis treści

• JavaScript Enlightenment
• Preface
  • Introduction
    • Why Did I Write This Book?
    • Who Should Read This Book?
    • Why JavaScript 1.5 and ECMAScript 3 Edition?
    • Why Didnt I Cover the Date(), Error(), and RegEx() Objects?
  • More Code, Fewer Words
  • Exhaustive Code and Repetition
  • Color-Coding Conventions
  • jsFiddle, JS Bin, and Firebug lite-dev
  • Conventions Used in This Book
  • Using Code Examples
  • Safari Books Online
  • How to Contact Us
  • About the Author
  • About the Technical Editors
    • Michael Richardson
    • Kyle Simpson
    • Nathan Smith
    • Ben Nadel
    • Ryan Florence
    • Nathan Logan
• 1. JavaScript Objects
  • Creating Objects
  • JavaScript Constructors Construct and Return Object Instances
  • The JavaScript Native/Built-In Object Constructors
  • User-Defined/Non-Native Object Constructor Functions
  • Instantiating Constructors Using the new Operator
  • Creating Shorthand/Literal Values from Constructors
  • Primitive (a.k.a. Simple) Values
  • The Primitive Values null, undefined, string, 10, true, and false Are Not Objects
  • How Primitive Values Are Stored/Copied in JavaScript
  • Primitive Values Are Equal by Value
  • The String, Number, and Boolean Primitive Values Act Like Objects When Used Like Objects
  • Complex (a.k.a. Composite) Values
  • How Complex Values Are Stored/Copied in JavaScript
  • Complex Objects Are Equal by Reference
  • Complex Objects Have Dynamic Properties
  • The typeof Operator Used on Primitive and Complex Values
  • Dynamic Properties Allow for Mutable Objects
  • All Constructor Instances Have Constructor Properties that Point to Their Constructor Function
  • Verify that an Object Is an Instance of a Particular Constructor Function
  • An Instance Created From a Constructor Can Have Its Own Independent Properties (Instance Properties)
  • The Semantics of JavaScript Objects and Object() Objects
• 2. Working with Objects and Properties
  • Complex Objects Can Contain Most of the JavaScript Values as Properties
  • Encapsulating Complex Objects in a Programmatically Beneficial Way
  • Getting/Setting/Updating an Objects Properties Using Dot Notation or Bracket Notation
  • Deleting Object Properties
  • How References to Object Properties Are Resolved
  • Using hasOwnProperty, Verify That an Object Property Is Not From the Prototype Chain
  • Checking If an Object Contains a Given Property Using the in Operator
  • Enumerate (Loop Over) an Objects Properties using the for in Loop
  • Host Objects versus Native Objects
  • Enhancing and Extending Objects with Underscore.js
• 3. Object()
  • Conceptual Overview of Using Object() Objects
  • Object() Parameters
  • Object() Properties and Methods
  • Object() Object Instance Properties and Methods
  • Creating Object() Objects Using Object Literals
  • All Objects Inherit From Object.prototype
• 4. Function()
  • Conceptual Overview of Using Function() Objects
  • Function() Parameters
  • Function() Properties and Methods
  • Function Object Instance Properties and Methods
  • Functions Always Return a Value
  • Functions Are First-Class Citizens (Not Just Syntax but Values)
  • Passing Parameters to a Function
  • this and arguments Values Available To All Functions
  • The arguments.callee Property
  • The Function Instance length Property and arguments.length
  • Redefining Function Parameters
  • Return a Function Before It Is Done (Cancel Function Execution)
  • Defining a Function (Statement, Expression, or Constructor)
  • Invoking a Function [Function, Method, Constructor, or call() and apply()]
  • Anonymous Functions
  • Self-Invoking Function Expression
  • Self-Invoking Anonymous Function Statements
  • Functions Can Be Nested
  • Passing Functions to Functions and Returning Functions from Functions
  • Invoking Function Statements Before They Are Defined (Function Hoisting)
  • A Function Can Call Itself (Recursion)
• 5. The Head/Global Object
  • Conceptual Overview of the Head Object
  • Global Functions Contained Within the Head Object
  • The Head Object versus Global Properties and Global Variables
  • Referring to the Head Object
  • The Head Object Is Implied and Typically Not Referenced Explicitly
• 6. The this Keyword
  • Conceptual Overview of this and How It Refers to Objects
  • How Is the Value of this Determined?
  • The this Keyword Refers to the Head Object in Nested Functions
  • Working Around the Nested Function Issue by Leveraging the Scope Chain
  • Controlling the Value of this Using call() or apply()
  • Using the this Keyword Inside a User-Defined Constructor Function
  • The this Keyword Inside a Prototype Method Refers to a Constructor Instance
• 7. Scope and Closures
  • Conceptual Overview of JavaScript Scope
  • JavaScript Does Not Have Block Scope
  • Use var Inside Functions to Declare Variables and Avoid Scope Gotchas
  • The Scope Chain (Lexical Scoping)
  • The Scope Chain Lookup Returns the First Found Value
  • Scope Is Determined During Function Definition, not Invocation
  • Closures Are Caused by the Scope Chain
• 8. Function Prototype Property
  • Conceptual Overview of the Prototype Chain
  • Why Care About the prototype Property?
  • Prototype Is Standard on All function() Instances
  • The Default prototype Property Is an Object() Object
  • Instances Created From a Constructor Function are Linked to the Constructors prototype Property
  • Last Stop in the prototype Chain is Object.prototype
  • The prototype Chain Returns the First Property Match It Finds in the Chain
  • Replacing the prototype Property with a New Object Removes the Default Constructor Property
  • Instances That Inherit Properties from the Prototype Will Always Get the Latest Values
  • Replacing the prototype Property with a New Object Does Not Update Former Instances
  • User-Defined Constructors Can Leverage the Same Prototype Inheritance as Native Constructors
  • Creating Inheritance Chains (the Original Intention)
• 9. Array()
  • Conceptual Overview of Using Array() Objects
  • Array() Parameters
  • Array() Properties and Methods
  • Array Object Instance Properties and Methods
  • Creating Arrays
  • Adding and Updating Values in Arrays
  • Length versus Index
  • Defining Arrays with a Predefined Length
  • Setting Array Length can Add or Remove Values
  • Arrays Containing Other Arrays (Multidimensional Arrays)
  • Looping Over an Array, Backwards and Forwards
• 10. String()
  • Conceptual Overview of Using the String() Object
  • String() Parameters
  • String() Properties and Methods
  • String Object Instance Properties and Methods
• 11. Number()
  • Conceptual Overview of Using the Number() Object
  • Integers and Floating-Point Numbers
  • Number() Parameters
  • Number() Properties
  • Number Object Instance Properties and Methods
• 12. Boolean()
  • Conceptual Overview of Using the Boolean() Object
  • Boolean() Parameters
  • Boolean() Properties and Methods
  • Boolean Object Instance Properties and Methods
  • Non-Primitive False Boolean Objects Convert to true
  • Certain Things Are false, Everything Else Is true
• 13. Working with Primitive String, Number, and Boolean Values
  • Primitive/Literal Values Are Converted to Objects When Properties Are Accessed
  • You Should Typically Use Primitive String, Number, and Boolean Values
• 14. Null
  • Conceptual Overview of Using the null Value
  • typeof Returns null Values as object
• 15. Undefined
  • Conceptual Overview of the undefined Value
  • JavaScript ECMAScript 3 Edition (and Later) Declares the undefined Variable in the Global Scope
• 16. Math Function
  • Conceptual Overview of the Built-In Math Object
  • Math Properties and Methods
  • Math Is Not a Constructor Function
  • Math Has Constants You Cannot Augment/Mutate
• A. Review
• B. Conclusion
• Index
• About the Author
• Colophon
• Copyright