Swift Types - Part Two

Question 1

Types - definition.

Answer 1

A construct to represent different kinds of data.

Question 2

“I am a String, Because”

Answer 2

“I am wrapped in quotes”

Question 3

How to Add Strings: (2 Ways).

Answer 3

Concatenation

or…

String Interpolation

Question 4

String Interpolation

Answer 4

String Interpolation is a way to construct a new string value from a mix of other strings. Same constants as before:

let country = "United States of America" let state = "North Carolina"let city = "Charlotte"let street = "West Street" Example: let interpolatedAddress = "\(country), \(state), \(city)"

Using String Interpolation, you can evaluate the contents of more than just strings.

Question 5

Concatenation

Answer 5

// Concatenationlet country = "United States of America"let state = "North Carolina"let city = "Charlotte"let street = "West Street"let concatenatedAddress = country + ", " + state + ", " + city

the first method is called concatenation. This is an overly complicated sounding word, but it’s just programmer speak for adding two strings together.

Question 6

Kinds of Types

Answer 6

• Strings
• Numbers & Booleans

Question 7

An Integer (Int) is a:

Answer 7

Whole #, like 42 or -25

Question 8

Floating Point Numbers (Double Or Float)
Default is double

Answer 8

Numbers With a Fractional Component

Question 9

Boolean Type (Bool)

Answer 9

True (1) or False (0)

Question 10

Type Inference

Answer 10

Type inference enables the compiler to deduce the type of a particular expression automatically by examining the values we provide.

Question 11

Type Safety

Answer 11

Cannot use an int instead of a string once declared

Question 12

To Explicity State the Type of Data (examples):

Answer 12

// Integerlet secondValue: Int = 4// Stringlet bestPlayer: String = "Micheal Jordan"// Doublelet averagePointsPerGame: Double = 30.1// Booleanlet hallOfFame: Bool = true