Variables and Types in Swift

What is the keyword for declaring a variable?

• variable

• var

• score

• let

What is the term coders used for stored information using containers

• Variable

• Type

• Constant

• Algorithm

Why would you want to use a variable in your code?

• You anticipate that you may want to change the value throughout the program.

• Variables are the only way to store values.

• You use variables when anticipate the values will not change throughout the program.

• Variables can be used to declare values such as pi in mathematical equations.

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

• Type writing

• Type interference

Which line shows the correct type annotation in Swift?

• String: let name

• let String: name

• let name: String

• let String

Which of the following is NOT a type?

• String

• Variable

• Double

• Integer

If you are 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 Xcode

• Rewrite the section of code using different encapsulation

• Assign different value types to the variable and check for errors.

How can you change the type of a constant or variable after it's declared?

• Create the values as a var variable

• Don't give the value a type

• You can't change the type of a value

• Assign a new value of a different type

Which line is declaring a constant?

• name = "Johnny"

• let name = "Johnny"

• let "Johnny" = name

• var name = "Johnny"