Question

When I try to write multiple constructors in coffee script, i get this error: cannot define more than one constructor in a class.

How can I do this:

class Vector2
  x: 0
  y: 0

  constructor:() ->

  constructor:(@x, @y) ->

  constructor:(vector) ->
     x = vector.x
     y = vector.y

I want to have an empty constructor and 2 other constructors. Is this possible?

Answer 1

simple do that in the coffeescript way:

class Vector
  constructor:(@x=0,@y=0) ->
      if typeof @x is "object"
        vector=@x
        @x=vector.x
        @y=vector.y

###
test start
###
v=new Vector()
console.log v.x,v.y
v=new Vector(1,1)
console.log v.x,v.y
v=new Vector {x:1,y:1}
console.log v.x,v.y
###
test end
###