In UnityScript aka JavaScript:

var myArray1 : boolean[];

var myArray2 : boolean[] = new boolean[10];

... I'm not sure if the 3rd option I posted in the C# answer is also possible in UnityScript (I didn't find a way to do it but I neither like UnityScript nor use it a lot ;-) ).

In C#:

bool[] myArray;

or:

bool[] myArray = new bool[10];

if you want to declare an array with 10 "slots". Or:

bool[] myArray = new bool[]{ true, true, false, true };

if you already want to assign it some values.