What's different between two constructors?

Question

What different between this type of constructor?

class ColorsArray(context: Context) {}

and

class ColorsArray(var context: Context){}

Answer 1

The second class not only declares a constructor that takes a Context, but it also has a property named context where it saves the value passed into the constructor. You can then access this like so:

val colorsArray = ColorsArray(context)
println(colorsArray.context)

Since you've declared it as a var and not a val, this can also be reassigned.

colorsArray.context = someOtherContext

Properties declared in the primary constructor are covered in the docs here.