bug?: set properties in constructor using the object setting parameter shorthand.

[1o0o0o0o1]

In the constructor of class, if we set properties using the shorthand, there seems to be a bug.

Background

the shorthand syntax in the doc:

You can easily set properties in constructor functions and in methods using the object setting parameter shorthand.

and the example in the doc:

class A
  (@x) ->

  f: (@y) ->
    @x + @y

a = new A 2
a.x   #=> 2
a.f 3 #=> 5
a.y   #=> 3

test case: with shorthand syntax

If we firstly assign some values such as rows and columns, and then use these values later in the constructor, there is a bug.

class Test
    (@rows, @columns) ->
        @grid = do
          row <- Object.keys(Array(@rows).fill(0)) .map
          column <- Object.keys(Array(@columns).fill(0)) .map
          "#{row},#{column}"

t = new Test(3,3)
console.log t

the result is

{"rows":3,"columns":3,"grid":[["0,0"],["1,0"],["2,0"]]}

The grid is not what we expected.

test case: without shorthand syntax

class Test
    (rows, columns) ->
        @rows = rows
        @columns = columns
        @grid = do
          row <- Object.keys(Array(rows).fill(0)) .map
          column <- Object.keys(Array(columns).fill(0)) .map
          "#{row},#{column}"

t = new Test(3,3)
console.log(t)

the result is

{"rows":3,"columns":3,"grid":[["0,0","0,1","0,2"],["1,0","1,1","1,2"],["2,0","2,1","2,2"]]}

This works well.

I don't know if this condition is intended.

Update:

Sorry it is not a bug. There is a error in my code about the this bounds.