Swift Collections - Array

SwiftCollectionsArray.swift

import Foundation

//CREATE

//declaration using type annotation syntax (arrays are strongly typed)
let stringArray : Array<String>

//initialiser syntax uses type inference mechanism
var intArray = Array<Int>()
let shorterIntArray = [Int]()

//array literals syntax - usually used to initialise with predefined list of values
let literalIntArray: [Int] = []

//immutable version of array
let immutableIPhones = ["11", "11 Pro", "11 Pro Max"]

//mutable array
var iPhones = ["11", "11 Pro", "11 Pro Max"]

//check elements
iPhones.count
iPhones.isEmpty

//MODIFY

//add elements
iPhones.append("XR")
iPhones.append(contentsOf: ["8", "8 Plus"])
//print(iPhones)

iPhones.insert("7", at: 0)
//print(iPhones)

//remove elements
//iPhones.removeFirst() //LIFO
//iPhones.removeLast() //FIFO
//iPhones.remove(at: 0)
//print(iPhones)

//UPDATE

//iPhones[0] = "5s"
//print(iPhones)

//SORT

//let sortedIPhones = iPhones.sorted() //elements that conform to the Comparable protocol
//print(sortedIPhones)

//COPY

//like all collection types in the standard library, arrays have value semantics - when you assign an existing array to another variable, the array content is copied.
var iPhonesCopy = iPhones
iPhonesCopy.removeLast()
print(iPhonesCopy)
print(iPhones)

//ACCESS ELEMENTS
//let firstIPhone = iPhones[0]
let firstIPhone = iPhones.first
let lastIPhone = iPhones.last

//ITERATE

//iterate over all elements
for iPhone in iPhones {
//    print(iPhone)
}

//iterate over all elements and skip first
for iPhone in iPhones.dropFirst() {
//    print(iPhone)
}

//iterate over all elements and skip last
for iPhone in iPhones.dropLast() {
//    print(iPhone)
}

//iterate over all elements and get index of element
for (index, iPhone) in iPhones.enumerated() {
//    print("\(index). \(iPhone)")
}

//FIND ELEMENT

//let firstNotNewIPhone = iPhones.firstIndex { (iPhone) -> Bool in
//    return !iPhone.contains("11")
//}
//print(firstNotNewIPhone)


//TRANSFORM

let uppercasedIPhones = iPhones.map({ $0.uppercased() })
print(uppercasedIPhones)

let onlyNewIphones = iPhones.filter { (iPhone) -> Bool in
    return iPhone.contains("11")
}
print(onlyNewIphones)