Need help understanding class member meanings

[rayzorben]

I noticed that you can put class members outside of the constructor in a class such as

class Test
    @foo = "foo" # static variable
     bar = "bar" # private variable
     baz: "baz" # instance variable accessible by @baz

The last one, the 'instance variable' seems to work, but has unexpected behavior when it comes to arrays. Other values are re-initialized across instantiations, but array variables are not

class Test
    here: []
    test: 0

    constructor: (value, value2) ->
        @here.push value
        console.log @here
        console.log @test
        @test = value2
        console.log @test

testa = new Test 'a', 1
testb = new Test 'b', 2

As you can see here, test always starts out at 0, but here doesn't get re-initialized and will keep getting new values pushed onto the old array, which I find odd.

Output:

[ 'a' ]
0
1
[ 'a', 'b' ]
0
2

[Inve1951]

class Test
  @foo = "foo" # static member (shorthand for `Test.foo = "foo"`)
  bar = "bar" # class-scoped variable (behaves like a private static)
  baz: "baz" # instance member

With : in a class body you assign a prototype property. This is only done once. Unless the value is a primitive, all class instances inherit the same object reference, which causes the behavior you see.

Default values for non-primitives should be assigned in the constructor (@member = value).