Apple Development - Unit 1 - Getting started with App Developmen

Which of the following is a great environment for prototyping Swift code?

• Playgrounds

• Safari

• Terminal

• Xcode

What will the following code print to the console?

let helloWorld = “Hello, world!”

let helloPlayground = “Hello, playground!”

let goodbyePlayground = “Goodbye, playground!”

 

print(“Testing, testing, 1-2-3”)

• A.    “Goodbye, playground!”

• “Hello, world!”

• A.    “Hello, playground!”

• "Testing, testing, 1-2-3"

Which of the following values would be best represented with a constant?

•     Player level

•    Player location

• Player Name

• Player Score

   Which keyboard is used to declare a constant?

• Const

• Let

• Var

    Which keyword is used to declare a variable?

• Const

• Let

• Var

  Which of the following is not a reason for declaring most values as constants?

• It is a best practice

• It is safer, developers can rely on a consistent value

• Most values never change

• The compiler can make special optimizations for immutable values

   Using type inference, which of the following variables would be assigned a Double type?

• let speedLimit = 75.0

•   let country = “Belgium”

•     let population = 142000

• var state = "Rhode Island"

    Will the following code snippet compile? Why?

let number: Double = 3

• Yes, because 3 is a Double

• No, because 3 is not a Double

• Yes because the compiler will assign the value 3.0 to a number

     What is the value of myNumber at the end of the following code?

let x = 2

let y = 4

let z = 6

let myNumber = x + y + z

• 4

• 6

• 10

• 12

  What is the value of myNumber at the end of the following code?

let x = 2

let y = 4

let z = 6

let myNumber = x + y * z

• 18

• 26

• 32

• 36