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memorize.ai (lvl 286)

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print w/ forEach

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iOS Dev Swift

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Mar 1, 2020

Cards (28)

Section 1

(28 cards)

print w/ forEach

Front

cards.forEach({print("\($0.suit)\($0.value)")})

Back

remove an element from an array

Front

myArray.remove(at: 0 -or any number-) myArray.removeLast()

Back

passing an external argument label into a function

Front

an external argument label is just what appears in the parameter of a function func iLikeSwift(thisMuch amountLiked: Int) -- iLikeSwift(thisMuch: 2)

Back

to make sure the code does not crash with nil

Front

use an IF LET statement

Back

important .notation

Front

.value - gives the value of a button (like a UIStepper) sender.tag - gives the value of a sender (like a UILabel)

Back

reversing array

Front

print("
STRIDE") for index in stride(from: studentNames.count-1, through: 0, by: -1) { print(studentNames[index]) } print("
REVERSED w/range") for index in (0...studentNames.count-1).reversed() { print(studentNames[index]) } print("
REVERSED ITERATING") for student in studentNames.reversed() { print(student) }

Back

and statement

Front

&&

Back

to find how may elements in an array

Front

myArray.count

Back

creating an array with a struct

Front

struct Name { var name: String var number: String } var array: [Name] = [] array.append(Name(name: "Cooper", number: 5) array += (Name(name: "Jeff", number: 15) oliver = Name(name: "Oliver", number: 50) array += [oliver] array[0].name = "Cooper" array[1].name = "Jeff" array[2].name = "Oliver" array[0].number = 5 array[1].number = 15 array[2].number = 50

Back

to express an empty array

Front

var newAddresses = [String]()

Back

ternary operator

Front

question == 1 ? answer_if_true: answer_if_false ex: let resultString = denominator != 0 "\(numerator/denominator) : "Can't divide by Zero"

Back

rounded function

Front

called with .rounded() /// Rounds this value to an integral value using "schoolbook rounding." *use for anything with decimals (doubles)

Back

to sum quizzes up (72, 81, 89, 95, 92)

Front

var quizzes = [72, 81, 89, 95, 92] var sum = 0 for index in 0..<quizzes.count{ sum = sum + quizzes[index] } -this is going to take the first element, add it to zero, take the next element, add it to 72, etc...

Back

add an element into an array

Front

myArray.append(String, Int, Bool, etc)

Back

power function

Front

pow(Double, Double) 1st double = number 2nd double = to the power of the 2nd double

Back

if let statement

Front

if let input = Double(temperatureField.text!) { -execute this code- } else { -do this code- } what happens when the "input" is NOT a double, the code will skip to the else statement

Back

to create a new array in random order

Front

myArray.shuffled()

Back

make sure that the same statement is not repeated

Front

var index = -1 -put -1 because it's out of range, so won't be skipped- let messages = [...,..,.....,..] var newIndex: Int repeat { newIndex = Int.random(in: 0..<messages.count) } while index == newIndex index = newIndex messageLabel.text = messages[index] or var randomPhrase = "" repeat { randomPhrase = answerArray.randomElement()! } while resultLabel.text == randomPhrase resultLabel.text = randomPhrase

Back

to create a random number

Front

var randomNumber = Int.random(in: 0..<myArray.count-or any number-)

Back

to see if an array has nothing

Front

myArray.isEmpty

Back

or statement

Front

||

Back

find out how many rolls it takes to get a six

Front

var diceRoll: Int var numberOfRolls = 0 repeat { diceRoll = Int.random(in: 1...6) numberOfRolls += 1 } while number != 6

Back

to make sure the array does not repeat

Front

var newAddresses = [String]() for address in addresses { if newAddress.contains(address) == false { newAddress.append(address) } } addresses = newAddresses

Back

the print-object command

Front

In the LLDB (Line Level Debugger) po -swift expression- used to display the value of the swift expression

Back

add an array to a new array with .prefix and .suffix

Front

var player1Cards = Array(shuffledCards.prefix(halfwayPoint)) -taking cards from the "prefix" of 26, so everything from 0 to 25- var player2Cards = Array(shuffledCards.suffix(halfwayPoint)) -taking cards from the "suffix" of 26, so everything from 26 on-

Back

using mutable parameters to swap Bernie and Pete

Front

var firstPlace = "Bernie" var secondPlace = "Pete" func swapNames (first: inout String, second: inout String) { let temp = first first = second second = temp }

Back

to get random part of an array

Front

var randomNumber = Int.random(at: 0..<myArray.count) print(myArray[randomNumber]) or myArray.randomElement() -is an optional-

Back

Add an array to a new array

Front

var player1Cards = Array(deck[0..<26]) var player2Cards = Array(deck[26.<52]) player1Cards now has an array with a count of 26 "cards" with values that are from the the deck player2Cards now has an array with a count of 26 "cards" with values that are from the the second half of the deck

Back