how to name a variable of a specific type in swift code example

Example: how to name a variable of a specific type in swift

var myString: String = "this is a string"
var myInt: Int = 123
var myDouble: Double = 3.1415 // 64-bit 
var myFloat: Float = 3.14 // 32-bit
var myArray: [Int] = [3, 54, 12, 0] // can change to any other [type]