JavaScript - Like a Box of Chocolates

JavaScript
Like a Box of Chocolates

“Are you telling me that I can’t get away
anymore without getting deeply into Javascript?”

- Developer

“That is a disaster for me! I have made a career
out of actively avoiding Javascript.”

- Developer

“If I cant continue to ignore Javascript, then you
may as well amputate one of my limbs.”

- Developer

// Variable declaration
var firstName = "Forrest";

// Function declaration
function saying () {
return "Stupid is as stupid does";
}

// If statement
if (badGrades) {
return "Mom sleeps with teacher";
}

// Switch statement
var age = 10,
lifeState;
switch (age) {
case 10:
lifeState = "Young";
break;
case 60:
lifeState = "Old";
break;
}

// Object literal
var forrest = {
firstName : "Forrest"
};

// Array literal
var forrestFriends = ["Bubba", "Lieutenant Dan"];

// Shorthand assignment
function (boxOfChocolates) {
var life = boxOfChocolates || "Snickers bar";
}

// Ternary operators
(looking)? "I gotta find Bubba!" : "It's ok";

// Short-circuit logic
if (obj && obj.property) {
obj.property = "Lieutenant Dan, I got you some ice cream";
}

string
number
boolean
null
undeﬁned
object

Array
string
Date
number
function
boolean
RegExp
null
undeﬁned
object


// Function declaration
function party () {
return "Stupid is as stupid does";
}

typeof firstName // string
typeof party // function

// Object declaration
var forrest = {
};

// Array declaration

typeof forrest // object
typeof forrestFriends // object

var forrest = {
};

// Array declaration

forrest forrest // object // false
typeof instanceof Array
forrestFriends instanceof object // true
typeof forrestFriends // Array

// Various "false" values
var nullVal = null;
var undefinedVal = undefined;
var zeroVal = 0;
var falseVal = false;
var emptyString = "";

// All would equal false in an if-clause
if (emptyString) {
// Would never go in here
}

“Coercion is the practice of forcing another party
to behave in an involuntary manner”

- Wikipedia

// Assignment
var happy = true;

// Equality
if (7 == "7") {
// true
}

// Identity
if (7 === "7") {
// false
}

// Assignment
rci on
oe
var happy = true;
c
// Equality Ty pe
if (7 == "7") {
// true
}

// Identity
if (7 === "7") {
// false
}

// Type coercion
var sum = "5" + 6 + 7; // 567

// Prevent type coercion
var sum = parseInt("5", 10) + 6 + 7; // 18

// Self-invoking functions
(function () {
var investment = "Lieutenant Dan got me
invested in some kind of fruit company.";
})();

// Using arguments
function friends (friend1, friend2) {
return friend1 + " & " + friend2;
}

// Lieutenant Dan & Bubba
friends("Lieutenant Dan", "Bubba");

// Lieutenant Dan & undefined
friends("Lieutenant Dan");

// Using the arguments collection
function friends () {
var allFriends = [];
for (var i=0, il=arguments.length; i<il; i++) {
allFriends.push(arguments[i]);
};
return allFriends.join(" & ");
}

// Lieutenant Dan & Bubba
friends("Lieutenant Dan", "Bubba");

// Lieutenant Dan
friends("Lieutenant Dan");

function Forrest () {
this.firstName = "Forrest";
this.lastName = "Gump";
}

var forrest = new Forrest();

// Object declaration, literal style
var forrest = {
firstName : "Forrest",
lastName : "Gump"
};

// Iterating over properties
for (var item in forrest) {
console.log(item + ": " + forrest[item]);
}

var forrest = {
};

// Safe check for property
if ("firstName" in forrest) {
console.log(forrest.firstName);
}

function ForrestAsChild {
this.firstName = "Forrest";
};

// Method set via prototype
ForrestAsChild.prototype.runsFast = function () {
return true;
};

function ForrestAsGrownup {
this.joinsArmy = true;
};

// Prototype for new object
ForrestAsGrownup.prototype = new ForrestAsChild;

// Method set via prototype
ForrestAsGrownup.prototype.ruinsBathrobe = function () {
return "I think I ruined your roommate's bathrobe";
};

// Create an instance
var forrest = new ForrestAsGrownup();

// Returns "I think I ruined your roommate's bathrobe"
forrest.ruinsBathrobe();

// Returns true - from ForrestAsChild
forrest.runsFast();

// Fails
forrest.codesJavaScript();

forrest instance

ForrestAsGrownup

ForrestAsChild

Object

// Extending core JavaScript objects
if (typeof Array.prototype.push === "undefined") {
Array.prototype.push = function () {
for (var i=0, il=arguments.length; i<il; i++) {
this[this.length] = arguments[i];
};
return this;
}
}

var locations = ["Vietnam"];
locations.push("China", "White House");
// locations = ["Vietnam", "China", "White House"];

// Scope - global or local

// Global
var quote = "I had run for 3 years, 2 months,
14 days, and 16 hours."

function () {
// Local
var pantherParty = "I'm sorry I had to
fight in the middle of your Black Panther
party.";

// Global
question = "And so, you just ran?";
}

// Global
function meetingJFK () {
var JFKQuestion = "Congratulations, how do
you feel?";

// Local
function forrestReply () {
return "I gotta pee.";
}

return forrestReply();
}

meetingJFK(); // I gotta pee
forrestReply(); // Error: not accessible

// Controlling scope
function whoAmI () {
return this.nodeName;
}

whoAmI(); // undefined
whoAmI.call(document, "Hello"); // #document
whoAmI.apply(document.body, ["Hello", "Greetings?"]); // BODY

// closures
function happens (what) {
return function (verb) {
return what + " " + verb;
}
}

var action = happens("Shit");

action("happens"); // Shit happens

// closures
function happens (what) {
return function (verb) {
return what + " " + verb;
}
}

var action = happens("Shit");

// Breaking it down
var action = function (verb) {
return "Shit" + " " + verb;
};

var link;
for (var i=0; i<3; i++) {
link = document.createElement("a");
link.innerHTML = "Link " + i;
link.onclick = function () {
alert("I am link " + i);
};
document.body.appendChild(link);
};

var link;
for (var i=0; i<3; i++) {
link.innerHTML = "Link " + i;
link.onclick = function (index) {
return function () {
alert("I am link " + index);
};
}(i);
document.body.appendChild(link);
};

// Yahoo! JavaScript Module Pattern
var forrest = function () {

return {
getFirstName : function () {
return firstName;
}
};
}();

// Returns "Forrest"
forrest.getFirstName();

var forrest = function () {
var firstName = "Forrest",
getFirstName = function () {
return firstName;
};

return {
getFirstName : getFirstName
};
}();

// Returns "Forrest"
forrest.getFirstName();

// Namespacing
var Movie = {};

Movie.forrest = function () {
var lastName = "Gump";

return {
return this.firstName;
}
};
}();

Movie.forrest = function () {
var lastName = "Gump";

return {
return this.firstName;
}
};
}();

Movie.lieutenantDan = function () {
var lastName = "Taylor";

return {
firstName : "Dan",
getFullName : function () {
return Movie.forrest.getFirstName.call(this) + " " + lastName;
}
};
}();

Movie.lieutenantDan.getFullName();

// Minimize DOM access
document.getElementById("container").className = "js-enabled";
document.getElementById("container").innerHTML += "Hello Amsterdam";
document.getElementById("container").innerHTML += "Tell me how you doin'!";
document.getElementById("container").innerHTML += "I went on a nice boat
ride last night!";
document.getElementById("container").innerHTML += "...where Carrot Top made
a pass at me...";

// Minimize DOM access
var container = document.getElementById("container"),
content = "Hello Amsterdam";
container.className = "js-enabled";
content += "Tell me how you doin'!";
content += "I went on a nice boat ride last night!";
content += "...where Carrot Top made a pass at me...";
container.innerHTML = content;

function richAndStupid () {
var rich = "And cause I was a gazillionaire, I
cut that grass for free.",
stupid = "Stupid is as stupid does.";
}

// Looping, variables and array lookups
function forrestForm () {
var allParagraphs = document.getElementsByTagName("p");
for (var i=0; i<allParagraphs.length; i++) {
var link = document.createElement("a");
link.href = "http://en.wikipedia.org/wiki/Forrest_Gump";
link.title = "Read about Forrest Gump at Wikipedia";
link.innerHTML = "Forrest Gump";

allParagraphs[i].className = "Forrested";
allParagraphs[i].appendChild(link);
}
}

// Looping, variables and array lookups
function forrestForm () {
var allParagraphs = document.getElementsByTagName("p");
for (var i=0, l=allParagraphs.length, link, paragraph; i<l; i++) {
link.href = "http://en.wikipedia.org/wiki/Forrest_Gump";
link.title = "Read about Forrest Gump at Wikipedia";
link.innerHTML = "Forrest Gump";

paragraph = allParagraphs[i];
paragraph.className = "Forrested";
paragraph.appendChild(link);
}
}

// Semicolon insertion
return
{
javascript : "Fantastic!"
};

// Semicolon insertion
return; // Semicolon insertion
{ // Considered an empty block
javascript : "Fantastic!"
}; // Semicolon insertion, dummy line

Robert Nyman
http://robertnyman.com/speaking/

Twitter: @robertnyman

Pictures:

Ninja Turtle: http://www.originalprop.com/blog/2008/03/20/teenage-mutant-ninja-turtles-costume-restoration/ Dog (Cat): http://www.cartoonstock.com/directory/f/false_identity.asp
Bruce Willis: http://www.starsjournal.com/3192/bruce-willis-is-being-sued-for-4-million-dollars.html Hillary Clinton & Soldier: http://confederateyankee.mu.nu/archives/154032.php
Swedish flag: http://www.olssonfoto.se/JAlbum/SGP%202008%20Ullevi/slides/Svenska%20flaggan.html Play with yourself: http://www.justwhatshesaid.com/?p=965
Euro Coin: http://accidentaldong.blogspot.com/2009/10/euro-uh-oh.html Overloading: http://theshadowhive.blogspot.com/2010/04/mutating-chaos-gene.html
Brad Pitt: http://open.salon.com/blog/just-walt/2009/10/29/real_men_he-men_pictures_whos_the_manliest_of_men
Kristen Bell: http://veronica-mars-episodes.download-tvshows.com/kristen-bell-loves-megan-fox/
Most popular language: http://odetocode.com/Blogs/scott/archive/2009/03/18/signs-that-your-javascript-skills- Extensible table: http://www.amishshowroom.com/index.php?main_page=index&cPath=40_64
need-updating.aspx Tiger Woods: http://blogs.bigadda.com/pal4868546/2010/01/
Sunrise: http://www.manywallpapers.com/space-wallpapers/earth/sunrise-from-space.html Pollution: http://blog.lib.umn.edu/cramb005/architecture/
Astronaut: http://martianchronicles.wordpress.com/2009/01/23/carnival-of-space-87/ Closure: http://today.msnbc.msn.com/id/4760120
Netscape 2: http://blog.explorelearning.com/2005/12/index.html Steve Ballmer: http://www.businessinsider.com/microsoft-completely-rebooted-its-mobile-strategy-yesterday-heres-
Internet Explorer 3: http://www.guidebookgallery.org/screenshots/browser what-you-missed-2010-2
Gandalf: http://web.mit.edu/kayla/Public/Backgrounds/LOTR%20Gandalf%204.JPG Inheritance: http://tithebarn.wordpress.com/2010/04/26/the-meek-shall-inherit-if-thats-alright-with-the-rest-of-you/
Now: http://www.geekologie.com/2007/07/15-week/ Crockford: http://gemsres.com/story/nov07/468365/Crockford_New_4681.jpg
Axe: http://bestgamewallpapers.com/a3-the-age-of-sovereign/axe Name: http://blog.usa.gov/roller/govgab/tags/names
Time: http://www.mindhacks.com/blog/seeing/index.html Space: http://gucken.deviantart.com/art/Sunrise-in-Space-56420137
Money: http://www.mediabistro.com/unbeige/ideas/ Fail better: http://ozguralaz.posterous.com/ever-tried-ever-failed-no-matt
Happy Ape: http://thesituationist.wordpress.com/2007/06/14/
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Forrest Gump: http://wallpaper-s.org/36__Forrest_Gump,_1994,_Tom_Hanks,_Robin_Wright_Penn.htm
Data: http://walrus.wr.usgs.gov/infobank/programs/html/definition/datadictionary.html

JavaScript - Like a Box of Chocolates

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