Coding Tests in Swift · cho.sh

Coding Tests in Swift

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source: hackingwithswift.com

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let weeks: Double = 465 / 7
print("There are (weeks) weeks until the event.")
// 66.42857142857143

swift

// creating empty dict
var someDict = [KeyType: ValueType]()

// creating prefilled dict
var someDict:[Int:String] = [1:"One", 2:"Two", 3:"Three"]

// filtering
var closeCities = cityDistanceDict.filter { $0.value < 1000 }

// Grouping an Array

var cities = ["Delhi","Bangalore","Hyderabad","Dehradun","Bihar"]
var GroupedCities = Dictionary(grouping: cities ) { $0.first! }
// ["D" :["Delhi","Dehradun"], "B" : ["Bengaluru","Bihar"], "H" : ["Hyderabad"]]

// remove
someDict.removeValue(forKey: 2)
// or simply
someDict[2] = nil

// enumerate
var myDictionary:[String:Int] = ["Mohan":75, "Raghu":82, "John":79]
for (idx, (key, value)) in myDictionary.enumerated() {
   print("(idx): key is (key), value is (value)")
}

swift

let ingredients: Set = ["cocoa beans", "sugar", "cocoa butter", "salt"]if ingredients.contains("sugar") { print("No thanks, too sweet.")}

// when init-ing empty set, must configure the type
Set<Int>()

.isEmpty
.count
.insert
let shortNames = cast.filter { $0.count < 5 }

// removing
var ingredients: Set = ["cocoa beans", "sugar", "cocoa butter", "salt"]
let toRemove = "sugar"
if let removed = ingredients.remove(toRemove) {
    print("The recipe is now (removed)-free.")
}

Coding Tests in Swift

Division

While

For

Dict

Set

Stacks and Queues

Iterate String in Swift

Map an Array

Checking Type

Sort

String Index

Array Cut