ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

create a project
add views
define layouts
integrate functions
connect ui to code
respond to events

func firstCharacter(of word: String) -> Character {
	return word[word.startIndex]
}

firstCharacter(of: "Mom")

import Fundation

func placeFirstLetterLast(myString: String){
	
}

func placeFirstLetterLast (myString: String) -> String {
	var myString = myString
	myString.append(firstCharacter(of: myString))
	return myString
}
func shortNameFromName(name: String) -> String {
	let lowercaseName = name.lowercaseString
	let vowelSet = CharacterSet(charactersIn: "aeiou")
}

shortNameFromName(name: "Nate")
//
shortNameFromName(name: "Talia")
//

func lyricsForName(lyricsTemplate: String, fullName: String) -> String {
	let shortName = shortNameForName(name: fullName)

	let lyrics = lyricsTemplate
		.replacingOccurrences(of: "<FULL_NAME>", with: fullName)
		.replacingOccurrences(of: "<SHORT_NAME>", with: shortName)

	return lyrics
}

The function print, min, max, and abs are a few examples of global functions. Check out a complete list of Swift’s global functions.

print("I'm a global function!")

var initialPrice = 50
var bestOffer = 45
var finalPrice = min(bestOffer, initialPrice)

Anatomy of a function

func functionName (_ parameterName: parameterType) -> returnType {
	statements to execute
	return object
}

func sumOfStrings(_ aBunchOfStrings: [String]) -> Int {
	let array = aBunchOfStrings
	var sum = 0
	for string in array {
		if Int(string) != nil {
			let int intToAdd = Int(string)!
			sum += intToAdd
		}
	}
	return sum
}

func reverse(_ string: String) -> String {
	var reversedString = ""
	for character in string.characters {
		reversedString = "\(character)" + reversedString
	}
	return reversedString
}

func warmUp(temperature: Int) -> Int {
	return temperature + 10
}
func firstChar(word: String) -> Character {
	return word[word.startIndex]
}

func concatenate(firstString: String, secondString secondString){
	return firstString + secondString
}
func warmUp(temperature: Int) -> Int {
	return temperature + 10
}
func firstCharacter(word: String) -> Character {
	return word[word.startIndex]
}
func concatenate(firstString: String, secondString: String)-> String {
	return firstString + secondString
}

var lightSwitchOn: Bool = true
var dimmer: Int = 7
var dimmerWithDecimals: Float = 3.14
var veryPreciseDimmer: Double = 3.14159265359

print(type(of: lightSwitchOn))
print(type(of: veryPreciseDimmer))

Bool
Double

Double, Bool, String, Float

use let to declare a constant when we expect its value to remain the same
we expect let not change

let encouragement = "You can do it!"

var personalizedEncouragement = "You can do it, Stephanie!"
personalizedEncouragement = personalizedEncouragement.replacingOccurrences(of: "Stephanie", with: "Ryder")

let birthYear = 2008
var currentYear = 2016
var age = currentYear - birthYear
age = currentYear - birthYear

var word = "fortunate"
word.contains("tuna")

var password = "Mary had a little loris"
var newPassword = password.replacingOccurences(of: "a" with "A")

import Foundation

var didYouKnowString = "Did you know that the Swift String class comes with lots of useful methods?"
var whisperString = "pass" + ", " + "\(didYouKnowString.lowercased())"
var shoutString = "TODO: Make the shoutString here!"

import Foundation

var forwardString = "stressed"

var lottaLikes = "If like, you wanna learn Swift like, you should build lots of small apps, cuz it's like, a good way to practice."

import Glibc

var nounArray = ["puppy", "laptop", "ocean", "app", "cow", "skateboard", "developer", "coffee", "moon"]

var index1 = Int(random() % 9)
var index2 = Int(random() % 9)

var sentence = "The \(nounarray[6]) spilled her \(nounArray[7])."

var sillySentence = "The \(nounArray[index1]) jumped over the \(nounArray[index2])."

print(sentence)
print(sillySentence)

var eString = "Meet me in St. Louis"
for character in eString.characters {
	if character == "e" {
		print("found an e!")
	} else {
	
	}
}

var eString = "Meet me in St. Louis"
for character in eString.characters {
	if character == "e" {
		print("found an e!")
	} else {	
	}
}

var theTruth = "Mony can buy me love."
var characterCount = theTruth.characters.count

var forwardString = "spoons"
var charactersReversed = forwardString.characters.reversed()
var backwardsString = String(charactersReversed)

print(backwardsString)

found an e!
found an e!
found an e!
snoops

var exitement: Character = "!"

var myFirstString: String = "In wine, there is wisdom."
var mySecondString: String = "In water, there is Giardia."

var characterPoorString = ""

var stringWithPotential = String()

var theTruth = myFirstString + " " + mySecondString

print(theTruth)

// Plain string
var doggyDiet = "Mia eats 10lbs of dog food per month"

// define variables
var dogName = "Mia"
var lbsPerMonth: Double = 10

// Same string, this time with the variable inserted
doggyDiet = "\(dogName) eats \(lbsPerMonth)lbs of dog food per month"
print(doggyDiet)

let kilosInALb = 0.45
lbsPerMonth = 25
var metricDoggyDiet = "\(dogName) eats \(kilosInAlb * lbsPerMonth)kilos of dog food per month"

print(metricDoggyDiet)

dogName = "Mia"
lbsPerMonth = 10
metricDoggyDiet = "\(dogName) eats \(kilosInALb * lbsPerMonth)kilos of dog food per month"

print(metricDoggyDiet)