Lesson 9 - Apple Swift Coding 1

What type is foo in the code below? let foo = "Hello"

• Let

• String

• "Hello"

• Hello

What type is foo in the code below? let foo = 42

• Double

• foo

• 42

• Int

What type is foo in the code below? let foo: Double = 42

• Double

• foo

• 42

• Int

What type is foo in the code below? var foo: SolarPhenomen

• SolarPhenomenon

• Interstellar

• variable

• Not possible to tell

What is one way Swift determines the type of a value in your code?

• Type intrusion

• Type allegiance

• Type writing

• Type inference

How does Swift decide what type distance should be? let distance: Double = 4

• Type inference

• Type annotation

• Typewriting

• Type interference

Which line shows correct type annotation in Swift?

• String: let name

• let String: name

• let name: String

• let String

If you're reading code and aren't sure of the type of a variable or constant, what's the quickest way to find out?

• Remember that variables are always strings and constants are always numbers.

• Option-click the constant's or variable's name in x-code

• Rewrite the section of code using different encapsulations

• Assign different value types to the variables and check for errors

How can you change the type of a Constant or Variable after it's declared?

• Create the Value as a Var Variable

• Don't give the value a type

• You can't change the value of a value

• Assign a new value of a different type