Exam (elaborations)

App Development with Swift Review Questions and Answers

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App Development with Swift Review Questions and Answers What are the three primary goals of swift? - ANSWER-Safe, fast, expressive What features of swift make it a "safe language" - ANSWER-Type safety, type inference, error handling, optionals. Which of the following is a great environment for...

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Uploaded on November 3, 2024
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app development with swift review questions and an

Institution 2024 Prep Tests
Course 2024 Prep Tests

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Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024

App Development with Swift Review

Questions and Answers

What are the three primary goals of swift? - ANSWER✔✔-Safe, fast, expressive

What features of swift make it a "safe language" - ANSWER✔✔-Type safety, type inference, error

handling, optionals.

Which of the following is a great environment for prototyping Swift code? - ANSWER✔✔-Playgrounds

(not xcode, safari, or terminal)

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") - ANSWER✔✔-"Testing, Testing, 1-2-3"

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

a. Player name

b. Player level

c. Player score

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,Copyright © KAYLIN 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH NOVEMBER, 2024

d. Player location - ANSWER✔✔-Player name

Which of the following would be best represented with a variable?

a. name

b. birthday

c. age

d. home address - ANSWER✔✔-age

Which keyword is used to declare a constant? - ANSWER✔✔-let

Which keyword is used to declare a variable? - ANSWER✔✔-var

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

a. It is a best practice

b. The complier can make special optimizations for immutable values.

c. It is safer; developers can rely on a consistent value

d. Most values never change - ANSWER✔✔-Most values never change

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

A. var state = "Rhode Island"

B. let country = "Belgium"

C. let population = 142000

D. let speedLimit = 75.0 - ANSWER✔✔-let speedLimit = 75.0

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Will the following code snippet compile? Why?

let number: Double = 3

a. Yes, because the compiler will assign the value 3.0 to number

b. Yes, because 3 is a double

c. No, because 3 is not a double - ANSWER✔✔-Yes, because the compiler will assign the value 3.0 to

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 - ANSWER✔✔-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 - ANSWER✔✔-26

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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 - ANSWER✔✔-2

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 - ANSWER✔✔-36

Identify the issue with the code snippet below:

let x = 14

let y = 2.5

let result = x * y - ANSWER✔✔-The code with not compile. x is a Int and y is an Double.

What is the operator called when it has an arithmetic symbol in front of the equals sign = ?

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