CoffeeScript instance methods

Question

I have a CoffeeScipt class defined like such

class Foo
  a: 1
  b: 2
  main: ->
   if a == 1
    log(1)

  log: (num) ->
    console.log(num)
f = new Foo
f.main()

it keeps erroring out saying that log is not defined. I tried making it @log: didn't work either. I tried making the -> of main a => and did not work either. How can I call instance methods from within the class itself?

Sergey Metlov · Accepted Answer · 2013-07-12 17:13:27Z

9

Use @ when calling instance methods and fields not when defining:

class Foo
  a: 1
  b: 2

  main: ->
   if @a == 1
    @log(1)

  log: (num) ->
    console.log(num)

f = new Foo()
f.main()

Defining methods with @ like this

@log: (num) ->
    console.log(num)

makes them static.
Look at the compiled JS while developing on CoffeeScript.

edited Jul 12, 2013 at 17:13

answered Jul 12, 2013 at 16:57

Sergey Metlov

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3 Comments

Alex Wayne Over a year ago

This plus using the new keyword and you should be set. f = new Foo()

ssarabando Over a year ago

And rewriting the if a == 1 to if Foo::a == 1 since a is also in the prototype.

rdodev Over a year ago

sorry I omitted the new keyword by it is in the original source. This seems to have worked. Thanks.

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