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CoffeeScript @20th Ruby Tuesday ৷ԈᎲ photo by gillyberlin

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@20th Ruby Tuesday

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You can get this slide on www.eddie.com.tw/slides

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Who am I ?

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I’m a Flash guy. photo by JD Hancock

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hmm.. maybe only 60% Flasher and 40% Rubyist photo by Crashmaster007

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a.k.a Eddie or Aquarianboy Live and work in Taipei, Taiwan. Serving in my own little tiny company. Flash / AS3 / Ruby / Rails / Python programming for living. A little bit Objective-C for personal inerests. Technical Education and Consulant. PTT Flash BM (since 2007/4). Adobe Certificaed Flash Developer (Since 2006/7). Linux Professional Institue Certification (Since 2005/3). ৷ԈᎲ photo by Eddie

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or just google with the keyword "৷ԈᎲ"

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JavaScript becomes hugely popular. 9th on TIOBE, Nov 2011 photo by gr3m

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photo by Andrew

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JavaScript seems easy.. photo by apple apple

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But it’s also easy o get messy! photo by Marcus Q

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CoffeeScript

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photo by Nick Humphries We’re not alking about this kind of coffee.

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Not this either. photo by naotoj

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WTF?

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CoffeeScript is JavaScript just written in different syntax

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Who won't need this?

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Who won't need this? people who already know javascrip(the good parts) very well.

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What’s the problems?

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photo by Steve Ganz

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Bad smell.. Will it be equal? that’s the question. 0 == "" // true 1 == true // true 1 == "1" // true 1 == "1.0" // true "true" == true // true "true" === true // false

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photo by Bryan Gosline What the..?

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I really don't know how o wrie good JavaScript!

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CoffeeScript exposes the good parts of JavaScript in a simple way.

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Synax borrowed from Python and Ruby. I love Python & Ruby

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If you’re already familiar with Ruby, you’ve probably already learned about 70% CoffeeScript.

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Really friendly for Rubyist. love_coffeescript == true if rubyist

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and compiles ino JavaScript code. *.coffee -> *.js

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Your Brain -> JavaScript -> Browser

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Your Brain -> Friendly CoffeeScript -> JavaScript -> Browser

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But that doesn’t mean you can have no knowledge about JavaScript.

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CoffeeScript is NOT used o replace JavaScript.

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Let’s get our feet wet! photo by jlhopes

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What are we looking at oday?

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- Insallation - Usage - Synax

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Insall photo by Daniel Dionne

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Requirements You need o insall some software first.. Node.js > git clone git://github.com/joyent/node.git > cd node > ./configure > make > sudo make insall

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Requirements You need o insall some software first.. NPM, the “node package manager” > curl http://npmjs.org/insall.sh | sh

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Insall CoffeeScript CoffeeScript > npm insall coffee-script > coffee -v CoffeeScript version 1.1.3 http://blog.eddie.com.w/2011/08/03/install-coffeescrip/

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Insall CoffeeScript CoffeeScript on MacOS > brew insall coffee-script http://blog.eddie.com.w/2011/08/03/install-coffeescrip/ ..and don’t forget insall the bundle for CoffeeScript if you’re using TextMae.

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Insall CoffeeScript TextMae bundle forCoffeeScript, CMD+B = build, CMD+R = run https://github.com/jashkenas/coffee-scrip-tmbundle

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Insall CoffeeScript TextMae bundle forCoffeeScript, CMD+B = build, CMD+R = run https://github.com/jashkenas/coffee-scrip-tmbundle

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Insall CoffeeScript Windows?

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Insall CoffeeScript Windows? get a mac

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How o use photo by roboppy

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Usage Compile *.coffee ino *.js > coffee --wach --compile app.coffee http://blog.eddie.com.w/2011/08/03/how-to-use-coffeescrip-compiler/

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Usage Compile *.coffee ino *.js > coffee --wach --compile app.coffee http://blog.eddie.com.w/2011/08/03/how-to-use-coffeescrip-compiler/

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Usage you got a REPL, just like irb.

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Usage you got a REPL, just like irb.

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Don’t like o compile? You can run CoffeeScrip in HTML directly

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Use CoffeeScript on the fly

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Use CoffeeScript on the fly

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Use CoffeeScript on the fly alert 'est'

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Use CoffeeScript on the fly alert 'est'

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don’t do this in your production.

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Synax photo by zigazou76

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} } } }

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No { } indenations rule! whitespace matters!

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( ) is not always necessary. Just like Ruby

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but.. hello +5 means hello(+5) + : convert string to number

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No trailing semicolon.

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Return is not necessary. everything is an expression, just like Ruby.

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No { }, (), and ;

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No { }, (), and ; // javascript if(age > 20){ voe(); }

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No { }, (), and ; // javascript if(age > 20){ voe(); } # coffeescript if age > 20 voe()

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Variables

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Variable You don’t have o declare it before using it.

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Variable You don’t have o declare it before using it. # coffeescript lang = ["php", "python", "perl", "ruby"] name = "Eddie"

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Variable You don’t have o declare it before using it. # coffeescript lang = ["php", "python", "perl", "ruby"] name = "Eddie" // javascript var lang, name; lang = ["php", "python", "perl", "ruby"]; name = "Eddie";

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Variable Destructuring Assignment

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Variable Destructuring Assignment # coffeescript x = 100 y = 10 [x, y] = [y, x]

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Variable Destructuring Assignment # coffeescript x = 100 y = 10 [x, y] = [y, x] // javascript var x, y, _ref; x = 100; y = 10; _ref = [y, x], x = _ref[0], y = _ref[1];

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Variable Destructuring Assignment

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Variable Destructuring Assignment # coffeescript weatherReport = (location) -> [location, 72, "Mostly Sunny"] [city, emp, forecast] = weatherReport "Berkeley, CA"

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Variable Destructuring Assignment # coffeescript ag = "" [open, conents..., close] = ag.split("") # coffeescript weatherReport = (location) -> [location, 72, "Mostly Sunny"] [city, emp, forecast] = weatherReport "Berkeley, CA"

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Function

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-> dash rocket

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->""<- enjoy coding :) Not

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-> "hello, Ruby Tuesday"

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-> "hello, Ruby Tuesday" (function() { return "hello, Ruby Tuesday"; });

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Function

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Function # coffeescript say_hello = (guest1, guest2 = "Nayumi") -> "Hello #{guest1} and #{guest2}" say_hello "Eddie"

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Function # coffeescript say_hello = (guest1, guest2 = "Nayumi") -> "Hello #{guest1} and #{guest2}" say_hello "Eddie" // javascript var say_hello; say_hello = function(guest1, guest2) { if (guest2 == null) { guest2 = "Nayumi"; } return "Hello " + guest1 + " and " + guest2; }; say_hello("Eddie");

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=> fat arrow http://blog.eddie.com.w/2011/11/18/dash-rocket-vs-fat-arrow-in-coffeescrip/

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Global Variables

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Global Variables (function() { }).call(this);

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http://blog.eddie.com.w/2011/11/18/global-variables-in-coffeescrip/

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http://blog.eddie.com.w/2011/11/18/global-variables-in-coffeescrip/ window.logout = -> alert "You've already logout!" if confirm "logout!?" # coffeescript

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http://blog.eddie.com.w/2011/11/18/global-variables-in-coffeescrip/ window.logout = -> alert "You've already logout!" if confirm "logout!?" # coffeescript root = exports ? this root.logout = -> alert "You've already logout!" if confirm "logout!?" # coffeescript

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http://blog.eddie.com.w/2011/11/18/global-variables-in-coffeescrip/ window.logout = -> alert "You've already logout!" if confirm "logout!?" # coffeescript root = exports ? this root.logout = -> alert "You've already logout!" if confirm "logout!?" # coffeescript

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Splats Just like Ruby

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...

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Splats

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Splats # coffeescript sum = (nums...) -> result = 0 result += n for n in nums result console.log sum(1, 2, 3, 4, 5)

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Array

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Array // javascript # coffeescript

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Array // javascript # coffeescript heroes = [ 'Spider Man', 'Capain America', 'X-men', 'Iron Man' ]

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Array // javascript # coffeescript heroes = [ 'Spider Man', 'Capain America', 'X-men', 'Iron Man' ] var heroes, students, eachers; heroes = ['Spider Man', 'Capain America', 'X-men', 'Iron Man'];

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Array // javascript # coffeescript heroes = [ 'Spider Man', 'Capain America', 'X-men', 'Iron Man' ] var heroes, students, eachers; heroes = ['Spider Man', 'Capain America', 'X-men', 'Iron Man']; students = [1..10]

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Array // javascript # coffeescript heroes = [ 'Spider Man', 'Capain America', 'X-men', 'Iron Man' ] var heroes, students, eachers; heroes = ['Spider Man', 'Capain America', 'X-men', 'Iron Man']; students = [1..10] students = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

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Array // javascript # coffeescript heroes = [ 'Spider Man', 'Capain America', 'X-men', 'Iron Man' ] var heroes, students, eachers; heroes = ['Spider Man', 'Capain America', 'X-men', 'Iron Man']; students = [1..10] eachers = [1...10] students = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

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Array // javascript # coffeescript heroes = [ 'Spider Man', 'Capain America', 'X-men', 'Iron Man' ] var heroes, students, eachers; heroes = ['Spider Man', 'Capain America', 'X-men', 'Iron Man']; students = [1..10] eachers = [1...10] eachers = [1, 2, 3, 4, 5, 6, 7, 8, 9]; students = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

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Array # coffeescript // javascript

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Array # coffeescript // javascript heroes[0..2]

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Array # coffeescript // javascript heroes[0..2] heroes.slice(0, 3);

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Array # coffeescript // javascript heroes[0..2] heroes[1..2] = ["Batman", "ThunderCat"] heroes.slice(0, 3);

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Array # coffeescript // javascript heroes[0..2] heroes[1..2] = ["Batman", "ThunderCat"] var _ref; [].splice.apply(heroes, [1, 2].concat(_ref = ["Batman", "ThunderCat"])), _ref; heroes.slice(0, 3);

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Object

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Object

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Object # coffeescript eddie = { name: "Eddie Kao", age: 18, speciality: "eat" }

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Object # coffeescript eddie = { name: "Eddie Kao", age: 18, speciality: "eat" } // javascript var eddie; eddie = { name: "Eddie Kao", age: 18, speciality: "eat" };

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Object

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Object # coffeescript eddie = name: "Eddie Kao" age: 18 lovers: nayumi: name: "Nayumi Hung" age: 18 mary: name: "Mary Bloody" age: 20

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Object # coffeescript eddie = name: "Eddie Kao" age: 18 lovers: nayumi: name: "Nayumi Hung" age: 18 mary: name: "Mary Bloody" age: 20 // javascript var eddie; eddie = { name: "Eddie Kao", age: 18, lovers: { nayumi: { name: "Nayumi Hung", age: 18 }, mary: { name: "Mary Bloody", age: 20 } } };

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Loop

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But we Rubyist barely use for-loop

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List Comprehension # coffeescript // javascript

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List Comprehension # coffeescript // javascript alert i for i in [1..10]

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); }

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); } alert i for i in [1..10] when i % 2 == 0

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); } alert i for i in [1..10] when i % 2 == 0 for (i = 1; i <= 10; i++) { if (i % 2 === 0) { alert(i); } }

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); } alert i for i in [1..10] when i % 2 == 0 alert i for i in [1..10] by 2 for (i = 1; i <= 10; i++) { if (i % 2 === 0) { alert(i); } }

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); } alert i for i in [1..10] when i % 2 == 0 alert i for i in [1..10] by 2 for (i = 1; i <= 10; i++) { if (i % 2 === 0) { alert(i); } } for (i = 1, _sep = 2; i <= 10; i += _sep) { alert(i); }

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); } alert i for i in [1..10] when i % 2 == 0 alert i for i in [1..10] by 2 alert i * 2 for i in [1..10] for (i = 1; i <= 10; i++) { if (i % 2 === 0) { alert(i); } } for (i = 1, _sep = 2; i <= 10; i += _sep) { alert(i); }

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List Comprehension # coffeescript // javascript alert i for i in [1..10] var i, _sep; for (i = 1; i <= 10; i++) { alert(i); } alert i for i in [1..10] when i % 2 == 0 alert i for i in [1..10] by 2 alert i * 2 for i in [1..10] for (i = 1; i <= 10; i++) { if (i % 2 === 0) { alert(i); } } for (i = 1, _sep = 2; i <= 10; i += _sep) { alert(i); } for (i = 1; i <= 10; i++) { alert(i * 2); }

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Condition

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Swich # coffeescript swich day when "Mon" then go work when "Tue" then go relax when "Thu" then go iceFishing when "Fri", "Sat" if day is bingoDay go bingo go dancing when "Sun" then go church else go work

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Modifier You can put "if", "unless", "while", "until" behind

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Modifier You can put "if", "unless", "while", "until" behind // javascript if (age > 20) { voe(); }

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Modifier You can put "if", "unless", "while", "until" behind # coffeescript voe() if age > 20 // javascript if (age > 20) { voe(); }

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Synactic Sugar

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Synactic Sugar # coffeescript // javascript wrie more readable code by using synactic sugar.

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Synactic Sugar # coffeescript // javascript wrie more readable code by using synactic sugar. is === isnt !== true, on, yes true false, off, no false not ! and && or || unless if not until while not of in

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# coffeescript Synactic Sugar

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# coffeescript Synactic Sugar alert "I can't see anything" if light is off

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# coffeescript Synactic Sugar alert "I can't see anything" if light is off alert "It's impossible!" if eddie isnt handsome

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# coffeescript Synactic Sugar alert "I can't see anything" if light is off alert "It's impossible!" if eddie isnt handsome if girl is not single alert "Don't Touch! Be Careful!"

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// javascript Synactic Sugar

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// javascript Synactic Sugar if (light === false) { alert("I can't see anything"); } if (eddie !== handsome) { alert("It's impossible!"); } if (girl === !single) { alert("Don't Touch! Be Careful!"); }

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Synactic Sugar Which answer do you like o hear when you say ...

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Synactic Sugar Which answer do you like o hear when you say ... Eddie: Will you marry me? Nayumi: yes!

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Synactic Sugar Which answer do you like o hear when you say ... Eddie: Will you marry me? Nayumi: yes! or Eddie: Will you marry me? Nayumi: true!

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Synactic Sugar

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Synactic Sugar # coffeescript alert "I'll marry you!" if answer is yes

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Synactic Sugar // javascript if (answer === true) { alert("I'll marry you!"); } # coffeescript alert "I'll marry you!" if answer is yes

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Synactic Sugar Chained Comparison

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Synactic Sugar # coffeescript console.log "I'm awesome!" if 20 < my_girl_friends < 100 Chained Comparison

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Synactic Sugar // javascript if ((20 < my_girl_friends && my_girl_friends < 100)) { console.log("I'm awesome!"); } # coffeescript console.log "I'm awesome!" if 20 < my_girl_friends < 100 Chained Comparison

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Synactic Sugar Exisential Operaor

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Synactic Sugar # coffeescript age ?= 18 Exisential Operaor

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Synactic Sugar # coffeescript age ?= 18 // javascript if (typeof age !== "undefined" && age !== null) { age; } else { age = 18; }; Exisential Operaor

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Raw JavaScript If you still prefer the original way..

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Raw JavaScript

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Raw JavaScript # coffeescript say_hello = `function(name){ return "Hello, " + name }`

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OOP

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OOP CoffeeScrip's classes are syntactic sugar only.

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Prootype?

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Prootype? IMHO, prooype-based OO is no elegant

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OOP - new

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OOP - new # coffeescript class Animal construcor: (name, age) -> this.name = name this.age = age animal = new Animal("eddie", 18) alert animal

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OOP - new # coffeescript class Animal construcor: (name, age) -> this.name = name this.age = age animal = new Animal("eddie", 18) alert animal // javascript var Animal, animal; Animal = (function() { function Animal(name, age) { this.name = name; this.age = age; } return Animal; })(); animal = new Animal("eddie", 18); alert(animal);

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OOP - @ = this.

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OOP - @ = this.

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# coffeescript OOP - method

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# coffeescript OOP - method class Animal construcor: (@name, @age) -> say_hello: (something) -> console.log "Hello, #{something}" animal = new Animal("eddie", 18) animal.say_hello("CoffeeScript")

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OOP - inheriance

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OOP - inheriance # coffeescript class Animal construcor: (@name, @age) -> say_hello: (something) -> alert "Hello, #{something}" class Human exends Animal walk: -> alert "I can walk with my foots!" eddie = new Human("eddie", 18) eddie.say_hello "CoffeeScript" eddie.walk()

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OOP - inheriance

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OOP - inheriance

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TL;DR

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Exend more function?

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Exend more function http://blog.eddie.com.w/2011/11/19/extend-functionaliy-for-your-class/

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Exend more function # coffeescript String::repeat = (n) -> Array(n + 1).join @ String::downcase = -> @oLowerCase() String::upcase = -> @oUpperCase() String::find = (str) -> @indexOf str String::has = (str) -> (@indexOf str) > 0 http://blog.eddie.com.w/2011/11/19/extend-functionaliy-for-your-class/

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Cooperae with other JS library or framework?

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working with jQuery

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working with jQuery // javascript $(document).ready(function() { wakeup(); walk_o_oilet(); pee(); go_back_o_sleep(); })

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working with jQuery # coffeescript $ -> wakeup() walk_o_oilet() pee() go_back_o_sleep() // javascript $(document).ready(function() { wakeup(); walk_o_oilet(); pee(); go_back_o_sleep(); })

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working with jQuery

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working with jQuery // javascript $('#girl').animae({ width: '100px', height: '50px', opacity: '0.8' }, 2000, 'easeOutQuad');

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working with jQuery # coffeescript $('#girl').animae width: '100px' height: '50px' opacity: '0.8' 2000 'easeOutQuad' // javascript $('#girl').animae({ width: '100px', height: '50px', opacity: '0.8' }, 2000, 'easeOutQuad');

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working with jQuery

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working with jQuery // javascript (function($){ $.fn.exend({ isEmail: function(email){ return /some email validaor/.est(email); } }); })(Query);

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working with jQuery # coffeescript $ = jQuery $.fn.exend isEmail: (email) -> /some email validaor/.est email // javascript (function($){ $.fn.exend({ isEmail: function(email){ return /some email validaor/.est(email); } }); })(Query);

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makes jQuery more easy, and more fun http://blog.eddie.com.w/2011/11/14/when-jquery-meets-coffeescrip/

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References http://blog.eddie.com.w/category/coffeescrip/ http://jashkenas.github.com/coffee-scrip/ Websies: https://github.com/sleepyfox/coffeescrip-koans http://upgrade2rails31.com/coffee-scrip Koans:

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References http://pragprog.com/book/tbcoffee/coffeescrip Book: http://arcturo.github.com/library/coffeescrip/index.html http://autoelicum.github.com/Smooh-CoffeeScrip/

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Conclusion

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being a 40% Rubyist I don’t like..

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being a 40% Rubyist I don’t like.. var

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being a 40% Rubyist I don’t like.. var return

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being a 40% Rubyist I don’t like.. var return for loop

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being a 40% Rubyist I don’t like.. var return for loop ()

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being a 40% Rubyist I don’t like.. var return for loop () {}

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I Love..

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Coding Style I Love.. I love Python & Ruby, of course :)

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Indenation! I Love..

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Anonymous function No global function and variable by default I Love..

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String Inerpolation I Love.. sorry, but string building really sucks :)

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List Comprehension I Love..

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Synactic Sugar I Love..

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English-like grammar I Love.. alert "of course it is!" if ruby_tuesday is awesome

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Comparison & Equality I Love.. "true" == true // true "true" === true // false

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Works with other JS frameworks well. Because it’s just JavaScrip I Love..

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Compilation I Love.. JSLint Approved

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What else?

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Make, Rake, Cake.

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More and more projects are writen in CoffeeScript.

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Pow.cx

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CoffeeScript compiler is writen in CoffeeScript.

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Tianium Mobile http://blog.eddie.com.w/2011/08/03/using-coffeescrip-in-titanium-studio/

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Immature? photo by theseanster93

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Performance? photo by theseanster93 photo by chr1sl4i

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CoffeeScript Means Giving Up on JavaScript?

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Learn JavaScript, and Use CoffeeScript.

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Any Question? photo by jamuraa

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৷ԈᎲ Conacts photo by Eddie Websie Blog Plurk Facebook Google Plus Twiter Email Mobile http://www.eddie.com.tw http://blog.eddie.com.tw http://www.plurk.com/aquarianboy http://www.facebook.com/eddiekao http://www.eddie.com.tw/+ https://twiter.com/#!/eddiekao [email protected] +886-928-617-687