Swift Programming Examples

Naming Constants Program

swift

let _const = "Hello, Swift 4!"
print(_const)

let 你好 = "你好世界"
print(你好)

Type Annotations Program

swift

let constA = 42
print(constA)

let constB:Float = 3.14159
print(constB)

Constants Declaration

swift

let constA = 42
print(constA)

Optional Binding

swift

var myString:String?
myString = "Hello, Swift 4!"

if let yourString = myString {
   print("Your string has - \(yourString)")
} else {
   print("Your string does not have a value")
}

Automatic Unwrapping

swift

var myString:String!
myString = "Hello, Swift 4!"

if myString != nil {
   print(myString)
} else {
   print("myString has nil value")
}

Forced Unwrapping Program

swift

var myString:String?

myString = "Hello, Swift 4!"

if myString != nil {
   print( myString! )
} else {
   print("myString has nil value")
}

Forced Unwrapping

swift

var myString:String?

myString = "Hello, Swift 4!"

if myString != nil {
   print(myString)
} else {
   print("myString has nil value")
}

Optionals

swift

var myString:String? = nil

if myString != nil {
   print(myString)
} else {
   print("myString has nil value")
}

Printing Variables

swift

var varA = "Godzilla"
var varB = 1000.00

print("Value of \(varA) is more than \(varB) millions")

Naming Variables

swift

var _var = "Hello, Swift 4!"
print(_var)

var 你好 = "你好世界"
print(你好)

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