1. 10 razões para você
usar CoffeeScript
e se apaixonar...
Lukas Alexandre
Saturday, January 19, 13

2. 1-Sintaxe limpa
• Inspirada em Ruby e Python;
• Parênteses opcionais;
message = 'Hello World'
sayHello message
Saturday, January 19, 13

3. 2-Impõe boas práticas de JS
• Escopos fechados;
• Previne “global namespace flooding”;
sayHello = (message) -> (function() {
console.log message
var sayHello;
sayHello 'Hello World'
sayHello = function(message) {
return console.log(message);
};
sayHello('Hello World');
}).call(this);
Saturday, January 19, 13

4. 3-Fat Arrow
• Workarounds imbutidos;
coffee = var coffee = {
isFull: true isFull: true,
watchDrink: -> watchDrink: function(){
$('.drink a').on 'click', => var that = this;
@isFull = false $('.drink a').on('click', function(){
that.isFull = false;
});
}
}
Saturday, January 19, 13

5. 4-Interpolação de strings
• Chega de + + + +
name = 'John Doe' var name = 'John Doe';
console.log "Hi, my name is #{name}" console.log("Hi, my name is " + "name")
Saturday, January 19, 13

6. 5-List Comprehensions
names = ['Foo', 'Bar', 'Baz'] var names = ['Foo', 'Bar', 'Baz'];
console.log(name) for name in names
for(var i=0; i < names.length; i++){
console.log(names[i]);
}
Saturday, January 19, 13

7. 6-Modificadores Condicionais
allowEntrance() unless age < 21 if(age > 21) {
allowEntrance() if age >= 21 allowEntrance()
}
if(age >= 21) {
allowEntrance()
}
Saturday, January 19, 13

8. 7-Classes
class Coffee
constructor: (@name) ->
brew: ->
console.log 'Brewing'
description: ->
console.log "Coffee is #{@name}"
frenchCoffee = new Coffee('French')
frenchCoffee.description # Coffee is French
Saturday, January 19, 13

9. 8-Uma visão do futuro
• Suporte de Brendan Eich;
• @ e => no JS;
Saturday, January 19, 13

10. 9-Aceitação da comunidade
• Rails >= 3.1;
• Python & PHP;
• Unit Testing frameworks;
Saturday, January 19, 13

11. 10-Ótimas fontes de aprendizado
• http://coffeescript.org
• http://coffeescriptcookbook.com
• http://www.codeschool.com/courses/
coffeescript
Saturday, January 19, 13

12. Contato
• pessoal: lukasalexandre@me.com
• profissional: lukas@codelogic.me
• http://github.com/lukasalexandre
Saturday, January 19, 13

13. Perguntas?
Saturday, January 19, 13

14. Referências
• http://www.netmagazine.com/features/10-
good-reasons-use-coffeescript
Saturday, January 19, 13