Int.random(in: -10...10)   //-6 : Random number in range -10 to 10

Int.random(in: Int.min...Int.max)   //5995714053130751044
UInt.random(in: 0..<10)             //8
Double.random(in: 0...10)           //0.4317509841160627
Float.random(in: 0...1)             //0.05182791
Bool.random()                       //false 

var arr = [1, 2, 4]
arr.randomElement()      //Returns an element from arr randomly

var dict = ["one": 1, "two": 2, "three": 3]
dict.randomElement() //Returns an element from dict randomly

(0...10).randomElement() //Returns an element from range randomly

var arr = [1, 2, 4]
arr.shuffled()      //returns a new array - [4, 2, 1]
arr.shuffle()       //shuffles elements in arr itself - [4, 1, 2]

(0...10).shuffled()   //[3, 2, 5, 7, 10, 9, 1, 6, 8, 4, 0]