JavaScript_Succinctly

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Object() object instance properties and methods ................................................... 85 Creating Object() objects using "object literals" ...................................................... 85 All objects inherit from Object.prototype ............................................................... 87 Chapter 11: Function() .............................................................................................. 89 Conceptual overview of using Function() objects ................................................... 89 Function() parameters ............................................................................................ 89 Function() properties and methods ........................................................................ 90 Function object instance properties and methods ..................................................... 91 Functions always return a value ................................................................................ 91 Functions are first-class citizens (not just syntax, but values) ................................... 92 Passing parameters to a function .............................................................................. 93 this and arguments values are available to all functions ......................................... 93 The arguments.callee property .............................................................................. 94 The function instance length property and arguments.length .............................. 95 Redefining function parameters ................................................................................. 96 Return a function before it is done (i.e. cancel function execution) ............................ 96 Defining a function (statement, expression, or constructor) ....................................... 97 Invoking a function (function, method, constructor, or call() and apply()) ............ 98 Anonymous functions ................................................................................................ 99 Self-invoking function expression .............................................................................. 99 Self-invoking anonymous function statements ......................................................... 100 Functions can be nested .......................................................................................... 100 Passing functions to functions and returning functions from functions..................... 101 Invoking function statements before they are defined (aka function hoisting) .......... 102 A function can call itself (aka recursion) .................................................................. 102 Chapter 12: The this Keyword ................................................................................ 104 Conceptual overview of this and how it refers to objects ....................................... 104 How is the value of this determined? ..................................................................... 105 The this keyword refers to the head object in nested functions ............................. 106 Working around the nested function issue by leveraging the scope chain ............... 108 Controlling the value of this using call() or apply() .......................................... 108 Using the this keyword inside a user-defined constructor function ........................ 110 The keyword this inside a prototype method refers to a constructor instance ....... 111 Chapter 13: Scope and Closures ............................................................................. 113 Conceptual overview of <strong>JavaScript</strong> scope ............................................................... 113 <strong>JavaScript</strong> does not have block scope ..................................................................... 114 Use var inside of functions to declare variables and avoid scope gotchas ............. 114 The scope chain (aka lexical scoping) ..................................................................... 115 The scope chain lookup returns the first found value............................................... 117 Scope is determined during function definition, not invocation ................................ 117 Closures are caused by the scope chain ................................................................. 118 Chapter 14: Function Prototype Property ............................................................... 120 Conceptual overview of the prototype chain ......................................................... 120 Why care about the prototype property? ............................................................... 121 Prototype is standard on all Function() instances .............................................. 121 The default prototype property is an Object() object .......................................... 122 6
7 Instances created from a constructor function are linked to the constructor’s prototype property ................................................................................................. 123 Last stop in the prototype chain is Object.prototype ........................................ 124 The prototype chain returns the first property match it finds in the chain .............. 124 Replacing the prototype property with a new object removes the default constructor property ................................................................................................................... 125 Instances that inherit properties from prototype will always get the latest values . 126 Replacing the prototype property with a new object does not update former instances ................................................................................................................. 127 User-defined constructors can leverage the same prototype inheritance as native constructors ............................................................................................................. 128 Creating inheritance chains (the original intention) .................................................. 130 Chapter 15: Array() .................................................................................................. 131 Conceptual overview of using Array() objects ....................................................... 131 Array() parameters ................................................................................................ 132 Array() properties and methods ............................................................................ 132 Array object instance properties and methods ......................................................... 132 Creating arrays ........................................................................................................ 133 Adding and updating values in arrays ...................................................................... 134 Length vs. index....................................................................................................... 135 Defining arrays with a predefined length ................................................................ 135 Setting array length can add or remove values ....................................................... 136 Arrays containing other arrays (aka multidimensional arrays) ................................. 136 Looping over an array, backwards and forwards ..................................................... 137 Chapter 16: Math Function........................................................................................ 139 Conceptual overview of the built-in Math object....................................................... 139 Math properties and methods .................................................................................. 139 Math is not a constructor function ............................................................................ 140 Math has constants you cannot augment or mutate ................................................ 140 Review ........................................................................................................................ 141
Page 2 and 3: By Cody Lindley Foreword by Daniel
Page 4 and 5: Table of Contents About the Author
Page 8 and 9: The Story behind the Succinctly Ser
Page 10 and 11: About the Author Cody Lindley is a
Page 12 and 13: Advanced technical books written ab
Page 14 and 15: “Consider that the cody object cr
Page 16 and 17: Chapter 1 JavaScript Objects Creati
Page 18 and 19: Using JavaScript, the getGender met
Page 20 and 21: * The String() constructor function
Page 22 and 23: new object that is returned from th
Page 24 and 25: Notes The Math object is the oddbal
Page 26 and 27: In this snippet, we created a new s
Page 28 and 29: Verify that literals are created fr
Page 30 and 31: The primitive values null, undefine
Page 32 and 33: The concept to take away here is th
Page 34 and 35: * This will throw an error and not
Page 36 and 37: copied, but not the actual value. T
Page 38 and 39: Sample: sample21.html // Primitive
Page 40 and 41: Notes Careful! If you mutate the na
Page 42 and 43: console.log(instanceOfCustomObject.
Page 44 and 45: myObject.prop = 'test'; myArray.pro
Page 46 and 47: Chapter 2 Working with Objects and
Page 48 and 49: Sample: sample31.html // Encapsula
Page 50 and 51: cody['getGender']() // Just slap th
Page 52 and 53: een defined. You might think that b
Page 54 and 55: console.log(myArray.toLocaleString(
Page 56 and 57:
Sample: sample44.html var cody = {
Page 58 and 59:
Sometimes a web browser manufacture
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I like this library because it take
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console.log(stringObject); // Logs
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Chapter 4 Number() Conceptual overv
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NEGATIVE_INFINITY POSITIVE_INFINIT
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Parameter passed to Boolean() = Mat
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console.log(Boolean(Math)); console
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var numberObject = new Number(1.100
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Chapter 7 Null Conceptual overview
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Chapter 8 Undefined Conceptual over
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Chapter 9 The Head/Global Object Co
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object. } // Logs bar, foo's value
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Make sure you understand that the h
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Object() parameters The Object() co
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Sample: sample72.html var cody = n
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Logs 'foo', being found at Object.p
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Sample: sample77.html var addFunct
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Sample: sample79.html var yelp = f
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parameters when defining the functi
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Notes The arguments.length property
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Invoking a function (function, meth
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Self-invoking anonymous function st
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the bar variable. All this is to sh
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Chapter 12 The this Keyword Concept
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Clearly, the value of this is based
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Working around the nested function
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What you need to learn here is that
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var john = new Person(); // No argu
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Notes An unlimited number of functi
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} (); How is the value of sayHiTex
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var parentFunction = function () {
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Chapter 14 Function Prototype Prope
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Sample: sample119.html var myFunct
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In this example, the foo property i
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console.log(FooInstance.constructor
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Providing a new object as the proto
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var chuck = new Person(0, 0); conso
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An Array() is just a special type o
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It is more common to see an array d
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console.log(myArray.length); // Log
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while (myArrayLength--) { // If len
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ceil() cos() exp() floor() log() ma
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That is: a complex value is equal t
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JavaScript_Succinctly

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