What is Dictionary?

 
Dictionary is unordered List which can be quickly access by key

 
Here is how you can declare Empty Dictionary

 

var emptyDictionary = [String : Int]()

 
Dictionary with Predefined Key Pairs

 

var apps = ["Productivity" : "Keynote", "Social" : "Facebook", "Music" : "iTunes"]

 
Accessing First Key Element of Dictionary

var optionalApp = apps["Productivity"] // Keynote

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What is Array?

 
Array is an ordered list with indices / Index
Example of an Array can be a to do list, Shopping list, Amazon Wish List etc.

 
Let’s say we have an array list of apps

 
Index: 0 1 2 3
Element: “Reminders” “Mail” “Xcode” “Calendar”

 

Important Note: Index of first element is always start with zero because way computer scientist deal with data in memory they have offset & offset starts with zero & thats why array starts with zero. Index of an array never exceed the number of elements.

 

Here is how to declare Array in Swift: We will declare array with let or var keyword then identifier name then equal sign & then square brackets. Each elements are separated with comma.

 

var apps = ["Reminders", "Mail", "Xcode", "Calendar"] // Array of Strings, Each element is of Type String
var number = [1, 2, 300, 4000] // Array of Integers, Each element is of Type Integer
var bools = [true, false, false, true] // Array of Boolean values, Each element is of Type Bool
var groups = [["John", "Tom", "Steve"], ["Brandon", "Bill"]] // Array inside array

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All About String in Swift Programming Language

 
Let’s know what is String, String is collection of characters

 
Here is how to declare a String

var courseName = "iOS Development"
var language = "Swift"

 
Here is how to use functions like String Concatenation i.e. attaching one string to second string

var hello = "Hello, "
let world = "World! "
let sentence = hello + world + "This is iOS Development" // "Hello, world! This is iOS Development"

 

Important Note: As you can see above we have used “+” operator to concatenate two strings together

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Data Types in Swift Language

 
Integers i.e. Int: 1, 2, 3, 199, 1000
Float & Doubles: 3.14, 1.168, M_PI
Boolean Values like Bool: true or false
Collection of Characters like Strings: “iOS Development”, “Apple”, “1.2”
We can create our own data type using keywords Struct & Class.

 
All About Variables

 

Here is how we declare Variables in Swift: First we start with ‘var’ keyword then ‘Identifier Name’ & ‘Initial Value’

 
Here is how to Declare Integer values: Int

var thisYear = 2017
var ourAge = 20

 
Here is how to Declare Empty Integer

var emptyInteger = Int()

 
Here is how to Declare String

var courseName = "iOS Development"
var language = "Swift"
var software = "Xcode"

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About Swift

 
Swift Programming Language is new sensation or new happening thing or next paradigm in computer programming world. Swift was introduced by Apple in WWDC – Apple’s World Wide Developer Conference in Year 2014. Apple declared Swift as OpenSource Programming Language on 3rd December 2015.

 
Swift is getting vary warm welcome from development community as breath of fresh air for their daily programming job.

 
Swift natively support Unicode Characters, Emojis, Asian Languages like Devanagari Characters & Chinese Characters. Which was lacking in 30 Year old programming Languages like C & Objective-C

 
Here is what others are saying about Swift Programming Language from Apple to wikipedia.

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