memory wise, are companion object more efficient? ...

# getting-started

[Karlo Lozovina]

memory wise, are companion object more efficient? will all class instances share a single companion object or is a separate one created for every instance?

[spand]

The companion object is a singleton

[nanodeath]

all `object`s are singletons, including the companion kind

[Karlo Lozovina]

so if I have this inside a class constructor:

val foobar = object {
  val x = "x"
}

all of the instances will share the same object?

[Dominaezzz]

Oh, that's an anonymous object.

[Dominaezzz]

All instances will have a unique object.

[Karlo Lozovina]

oh, so every instanc will have it's uqnie thing

[Karlo Lozovina]

right, right! thanks!

[Shawn]

if you want to declare a companion object, the syntax looks like this:

class Foo {
  companion object {
    val x = "x"
  }
}

[Shawn]

all instances of Foo will have a reference to that same companion object