Apple Swift Coding I - Lesson 3 - 4

What is the escape character for?

• Undoing the last program command

• Telling the computer to quit an app

• Skipping the rest of the string

• Treating the next character in a special way

Which of these is the escape character for coding in Swift?

• /

• \

• !

• '

• ESC

What is a character in programming?

• A distinguished coder like Ada Lovelace or Alan Turing

• A letter from A to Z

• A piece of a string like a letter punctuation mark, or number

• The first 140 ADCII symbols

The second line below has a "use of unresolved identifier" error. What does that mean?

• Names need to match capital and lowercase letters; it should be playgroundName

• playGroundName isn't a String

• The string interpolation is done wrong; it should use a /

• You can't repeat names

What is the result of the expression "1" + "1"

Hint: Not sure? Open the Strings playground, type it in and try it. That's not cheating: programmers try out little bits of code in Playgrounds all the time.

• 2

• "2"

• 11

• "11"

• "1 1"

Which of these are strings?

• let myLuckyNumber = 42

• "\"Curiouser and curiouser,\" said Alice."

• Neither

• Both A and B

Which of these are strings?

• "$9.99"

• "100%"

• Neither

• Both A and B

Which of these are strings

• 88

• "Happy birthday"

• Neither

• Both A and B

Which of these messages belongs in a console instead of in the main app's UI?

• Connection restored (now ReachableViaWWAN).

  Offline time: 1587 secs.

• You're back online!

Which of these messages belongs in a console instead of in the main app's UI?

• Your changes couldn't be saved.

• Mutating an object 0X98126450 after it has been removed from its context.