The JavaScript Programming Language

The JavaScript Programming Language Douglas Crockford

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The World's Most Misunderstood Programming Language

Sources of Misunderstanding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

History ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Not a Web Toy ,[object Object],[object Object],[object Object]

Key Ideas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Numbers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NaN ,[object Object],[object Object],[object Object],[object Object]

Number function ,[object Object],[object Object],[object Object],[object Object]

parseInt function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Math ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Strings ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

String length ,[object Object],[object Object]

String function ,[object Object],[object Object]

String Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Booleans ,[object Object],[object Object]

Boolean function ,[object Object],[object Object],[object Object],[object Object]

undefined ,[object Object],[object Object],[object Object]

Falsy values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Dynamic Objects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Loosely Typed ,[object Object],[object Object]

C ,[object Object],[object Object]

Identifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reserved Words ,[object Object]

Comments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Operators ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

+ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

+ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

/ ,[object Object],[object Object]

== != ,[object Object],[object Object],[object Object]

&& ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

|| ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

! ,[object Object],[object Object],[object Object]

Bitwise ,[object Object],[object Object]

Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Break statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

For statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

For statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Switch statement ,[object Object],[object Object],[object Object]

Switch statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Throw statement ,[object Object],[object Object],[object Object],[object Object],[object Object]

Try statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Try Statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

With statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Function statement ,[object Object],[object Object],[object Object]

Var statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scope ,[object Object],[object Object],[object Object]

Return statement ,[object Object],[object Object],[object Object],[object Object],[object Object]

Objects ,[object Object],[object Object],[object Object]

Collections ,[object Object],[object Object],[object Object],[object Object],[object Object]

Object Literals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Object Literals var myObject = {name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', level: 3}; var theName = myObject.name; var destination = myObject['goto']; 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"

Maker Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Object Literals var myObject = {name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', format: {type: 'rect', width: 1920, height: 1080, interlace: false, framerate: 24} };

Object Literals var myObject = { name: "Jack B. Nimble", 'goto': 'Jail', grade: 'A', format: { type: 'rect', width: 1920, height: 1080, interlace: false, framerate: 24 } };

Object Literals myFunction({ type: 'rect', width: 1920, height: 1080 }); throw { name: 'error', message: 'out of bounds' };

Object Literals ,[object Object],[object Object]

Object Augmentation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Linkage ,[object Object],[object Object],[object Object],[object Object]

Linkage var myNewObject = object(myOldObject); myNewObject myOldObject 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"

Linkage myNewObject.name = "Tom Piperson"; myNewObject.level += 1; myNewObject.crime = 'pignapping'; "pignapping" "crime" 4 "level" "Tom Piperson" "name" 3 "level" "A" "grade" "Jail" "goto" "Jack B. Nimble" "name"

Inheritance ,[object Object],[object Object]

Prototypal Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object]

Prototypal Inheritance ,[object Object],[object Object],[object Object],[object Object]

Object Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Object Construction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reference ,[object Object],[object Object],[object Object],[object Object],[object Object]

Delete ,[object Object],[object Object]

Arrays ,[object Object],[object Object],[object Object],[object Object],[object Object]

length ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Array Literals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Array Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Deleting Elements ,[object Object],[object Object],[object Object],[object Object]

Deleting Elements ,[object Object],[object Object],[object Object],[object Object],[object Object]

Arrays v Objects ,[object Object],[object Object],[object Object]

Distinguishing Arrays ,[object Object],[object Object],[object Object]

Arrays and Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Functions ,[object Object],[object Object],[object Object]

Function operator ,[object Object],[object Object],[object Object],[object Object],[object Object]

lambda ,[object Object],[object Object],[object Object]

Function statement ,[object Object],[object Object],[object Object],[object Object]

Inner functions ,[object Object],[object Object]

Scope ,[object Object],[object Object]

Closure ,[object Object],[object Object]

Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Function Objects ,[object Object],[object Object]

Method ,[object Object],[object Object]

Invocation ,[object Object],[object Object],[object Object]

Invocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Method form ,[object Object],[object Object],[object Object]

Function form ,[object Object],[object Object],[object Object],[object Object],[object Object]

Constructor form ,[object Object],[object Object],[object Object]

this ,[object Object],[object Object],[object Object],the new object constructor the object method the global object function this Invocation form

arguments ,[object Object],[object Object],[object Object],[object Object]

Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Augmenting Built-in Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

trim String.prototype.trim = function () { return this.replace( /^*(*(++)*)*$/, "$1"); };

supplant ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

supplant ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

typeof ,[object Object],'undefined' undefined 'object' null 'boolean' boolean 'string' string 'number' number 'object' array 'function' function 'object' object typeof type

eval ,[object Object],[object Object],[object Object],[object Object]

Function function ,[object Object],[object Object],[object Object],[object Object]

Built-in Type Wrappers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Confession ,[object Object],[object Object],[object Object],[object Object],[object Object]

Augmentation ,[object Object],[object Object],[object Object]

Working with the Grain ,[object Object],[object Object]

(global) Object ,[object Object],[object Object],[object Object],[object Object],[object Object]

Global variables are evil ,[object Object],[object Object],[object Object]

Implied Global ,[object Object],[object Object],[object Object],[object Object]

Namespace ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Encapsulate ,[object Object],[object Object]

Example YAHOO.Trivia = function () { // define your common vars here // define your common functions here return { getNextPoser: function (cat, diff) { ... }, showPoser: function () { ... } }; } ();

Thinking about type ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Date ,[object Object],[object Object]

RegExp ,[object Object],[object Object],[object Object],[object Object],[object Object]

Threads ,[object Object],[object Object],[object Object],[object Object]

Platforms ,[object Object],[object Object],[object Object],[object Object],[object Object]

ActionScript ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

E4X ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ECMAScript Fourth Edition ,[object Object],[object Object],[object Object],[object Object]

Style ,[object Object],[object Object],[object Object],[object Object],[object Object]

Style and JavaScript ,[object Object],[object Object],[object Object]

Code Conventions for the JavaScript Programming Language http://javascript.crockford.com/code.html

Semicolon insertion ,[object Object],[object Object],[object Object],[object Object]

Line Ending ,[object Object],[object Object],[object Object]

Comma ,[object Object],[object Object],[object Object],[object Object]

Required Blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Forbidden Blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variables ,[object Object],[object Object]

Expression Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

switch Statement ,[object Object],[object Object]

Assignment Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

== and != ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Labels ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JSLint ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

UHOH! ,[object Object],[object Object],[object Object],[object Object]

The JavaScript Programming Language Douglas Crockford [email_address] produce.yahoo.com/crock/javascript.ppt

The JavaScript Programming Language

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The JavaScript Programming Language