Swift

Table of Contents

Basics

Declaration

Use let to make a constant and var to make a variable.

var myVariable = 42
myVariable     = 50
let myConstant = 42

Type Inference

implicit and explicit

let implicitInteger        = 70
let implicitDouble         = 70.0
let explicitDouble: Double = 70

Data Types

  • Int or UInt

    • You can use Int32, Int64 to define 32 or 64 bit signed integer where as UInt32 or UInt64 to define 32 or 64 bit unsigned integer variables.

  • Float

    • 32-bit floating-point number

  • Double

    • 64-bit float

  • Bool

  • String

  • Character

  • Optional

    • Can hold either a value or no value.

Conditionals

if onSaleInferred {
  print("\(nameInferred) on sale for \(priceInferred)!")
} else {
  print("\(nameInferred) at regular price: \(priceInferred)!")
}

Statements

Guard

Topics

Strong vs. Weak Reference

Struc vs. Class

References

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