Coffeescript, classes and functions

Question

In JavaScript I'd set up a class like:

var SomeClass = (function()
{
    var _this   = { };
    var privateVar = 'foo'

    _this.publicVar = 'bar'

    function privateFunction()
    {
        return privateVar;
    }

    _this.publicFunction = function()
    {
        return _this.publicVar;
    }

    return _this;
})();

This is fine as in privateFunction I can reference publicFunction by either calling SomeClass.publicFunction() or _this.publicFunction()

Now in Coffeescript I'm trying to set up my class so that I can call class functions, how do I go about this? How can I create a class in coffeescript called Foo and get a function in the class to reference another function in that class?

mahdavipanah · Accepted Answer · 2012-06-22 14:12:16Z

2

I think this would help :


class Foo
  a: ->
    alert 'a invoked'
  b: ->
    @a()
    alert 'b invoked'
new Foo().b()

edited Jun 22, 2012 at 14:12

answered Jun 22, 2012 at 14:09

mahdavipanah

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1 Comment

Ahmed Nuaman Over a year ago

So how about 'private' functions?

hvgotcodes · Accepted Answer · 2012-06-22 15:00:46Z

1

Your question is confusing.

If you want to create a class method, you could do it like

class Foo
  constructor: ->        

  m1: ->
    Foo.classMethod()

  m2: ->
    @privateMethod()
    @m1()

Foo.classMethod = ->

note the last line. A class method is one that lives on the function that defines the class.

If you want to call a method from another method, its no big deal. m1 and m2 in this example demonstrate this. Note that each invocation is scoped to this, which is the current instance of your class Foo. So you could do

f = new Foo()
f.m2()

which would create a new instance of Foo, and then invoke m2 on that instance. m2 in turn invokes the class method classMethod.

Check this out to see the javascript to which the above coffeescript compiles.

edited Jun 22, 2012 at 15:00

answered Jun 22, 2012 at 13:59

hvgotcodes

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4 Comments

Ahmed Nuaman Over a year ago

So how about 'private' functions?

hvgotcodes Over a year ago

updated -- you do it in your constructor. Check out the link at the bottom so you can see the js

hvgotcodes Over a year ago

@AhmedNuaman, see stackoverflow.com/questions/10612293/… re private

mu is too short Over a year ago

@AhmedNuaman: This one might also be helpful: stackoverflow.com/q/9347782/479863

mahdavipanah · Accepted Answer · 2012-06-22 14:58:31Z

0

Invoking public method inside a private method

method a is private and method b is public

class Foo
  call_a: ->
    a.call(this)
  b: ->
    alert 'b invoked'
  a = ->
    alert 'a invoked'
    @b()

obj = new Foo
obj.call_a()

answered Jun 22, 2012 at 14:58

mahdavipanah

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