在这些替代方案中,哪一种是CoffeeScript中基于类的编程的最佳样式？

# Alternative 1
class Person
  constructor: (@name, @age) ->

new Person "Peter", 19

# Alternative 2
class Person
  name: ""
  age: 0
  constructor: (@name, @age) ->

new Person "Peter", 19

# Alternative 3
class Person
  constructor: (@name = "", @age = 0) ->

new Person "Peter", 19


# Alternative 4
class Person
  constructor: (name, age) ->
    @name = name ? ""
    @age = age ? 0

new Person "Peter", 19

解决方法:

嗯#1很简单. #3简洁地显示了预期的参数格式(尽管默认值实际上没有意义-除非您期望一个人被命名为“”或0岁).

我真的建议使用哈希代替：

class Person
  constructor: ({@name, @age}) ->

new Person(name: "Peter", age: 19)

这使您不必记住参数的顺序,并使您的实例化调用更加自我记录.

(我在CoffeeScript: Accelerated JavaScript Development中的某些示例中使用了这种方法.)