My first two hours on swift

annotations.swift

var shouldStoreDouble: Double = 200.0 // we restrict this by adding an annotation
print("Double annotation ", shouldStoreDouble);

// let see when we say our computer should create 
// a memory space for string but we  try to store an integer


var onlyStringPlease: String = "John"
print("String annotation ", onlyStringPlease)

// changing the next line throws error
// onlyStringPlease = 10
// we should get an error 
// [cannot convert value of type 'Int' to specified type 'String']

// this can also be done on collections
var userSelectedItem = ["rice", "beans"]
print(userSelectedItem)

// In general swift give us this two things
// Type Inference [ var myInt = 10]
// Type Safety    [ let ourDouble: Double = 20.0 ]