Simple Data types

• Booleans
• String (interpolation?)

Booleans

Boolean store binary data true || false

How to store truth:

// the method invocation returns a new value
// so instead of doing this
let filename = "file.jpg"
print(filename.hasSuffix(".jpg"))


// you can store the returned value
let doesFilenameHaveASuffix = filename.hasSuffix(".jpg")
print(doesFilenameHaveASuffix)

Fun fact: Booleans are named after mathematician, George Boole who put in at least 10,000 hours researching and writing about logic

Negating a boolean is simple with the use of the exclamation point

var someVal = false
someVal = !someVale  // true

// or you can do
someVal.toggle() // true

Scored 6/6 Doubles and Booleans

How to join strings together

Swift has string interpolation to show information based on data that may be changing.

• Concatenation
• String Interpolation

Concatenation works like this:

let a = "a string "
let b = "is a type"
let c = a + b
// a string is a type
let d = c + " of data"
print(d)

Interpolation work like this:

let name = "Al"
let age = 44
let message = "Hello, my name is \(name) and I'm \(age) years old"

Did you know: Calculations can be included in the interpolation.

Scored 6/6 String interpolation

Summary: simple data

• Constants are created with let, variables are created with var
• Strings contain text, from short strings to novles
• Strings are created with double quotes on both ends
• Multi line strings are created with triple double quotes at both ends
• Swift calls whole numbers integers
• Decimals are called Doubles
• True/false are stored in booleans
• Interpolation let us place data into strings