Type Conversion in Swift in Swift

In Swift, every value has a type: Int, Double, String, and so on. Sometimes you need to convert a value from one type to another.

Common type conversion methods:

String(x)           // converts Int or Double → String
Int(s)!             // converts String → Int
Double(s)!          // converts String → Double
Int(x)              // converts Double → Int (drops decimal)

Here are some examples:

let score = 42
let scoreStr = String(score)    // "42"

let weight = 70.8
let weightInt = Int(weight)     // 70  (decimal dropped)

let count = "100"
let countInt = Int(count)!      // 100

Note that converting a Double to Int with Int() simply drops the decimal - it does not round.