Why does this code count 6 elements, as 9 ("wrong") in swift playground.
var stringArray = ["1", "2", "3", "4", "5", "6"]
for var i = 0; i < 3; i++ {
stringArray.append("Paragraph" + "\(i)")
}
func concat (array: [String]) -> String {
let count = UInt32(stringArray.count) ** --> =9 **
let randomNumberOne = Int(arc4random_uniform(count))
let randomNumberTwo = Int(arc4random_uniform(count))
let randomNumberThree = Int(arc4random_uniform(count))
let concatString = array[randomNumberOne] + array[randomNumberTwo] + array[randomNumberThree]
return concatString
}
let finalString = concat(stringArray)
...but count this code as 6 (correct)
var stringArray = ["1", "2", "3", "4", "5", "6"] ** --> =6 **
let count = UInt32(stringArray.count)
Does it have something to do with 64 vs 32 bit? I have Xcode Version 6.0 (6A313).
You are appending new elements to the same stringArray which already has content ["1", "2", "3", "4", "5", "6"]. Then you append the "paragraph (i)" string to it 3 times. So, the new content is now, ["1", "2", "3", "4", "5", "6", "Paragraph 1", "Paragraph 2", "Paragraph 3"]. Thats how the count reached to 9.
Related
In my app I have a data pull from Firebase. I have a UITableViewController and would like to insert in a row a text from within the app. The data pull would be like this (please excuse the bad example but I cannot go into too much detail ..)
The original data pull:
Row 1: abc
Row 2: def
Row 3: ghi
Row 4: jkl
Row 5: mno
What I would like to achieve:
Row 1: abc
Row 2: def
Row 3: text from the app
Row 4: ghi
Row 5: jkl
Row 6: text from the app
Row 7: mno
How can I achieve this? I was trying to do something like this in cellForRowAt
if indexPath.row % 3 == 0 {
cell.text = "custom text"
}
But this is replacing every 3rd rows content. I would like to put a row in between, so to speak.
You can modify your server data with local data.
var serverData = ["a","b","c","d","e","f","g","h","i","j","k","l","m"]
let localAppData = ["1","2","3","4","5","6","7","8","9","10"]
var modified = [String]()
var counter = 0
for index in 1...serverData.count {
let value = serverData[index - 1]
if index % 3 == 0 && index != 0 {
if counter < localAppData.count {
modified.append(localAppData[counter])
}else{
modified.append(value)
}
counter += 1
}else{
modified.append(value)
}
}
serverData.removeAll()
serverData.append(contentsOf: modified)
print(serverData) //["a", "b", "1", "d", "e", "2", "g", "h", "3", "j", "k", "4", "m"]
if counter < localAppData.count {
// Appeds the remain local data to your serverData
serverData.append(contentsOf: localAppData[counter...localAppData.count-1])
}
print(serverData) //["a", "b", "1", "d", "e", "2", "g", "h", "3", "j", "k", "4", "m", "5", "6", "7", "8", "9", "10"]
Note: After modification you have to reload the tableView
You can update the datasource by inserting the value at 3rd position and use that datasource in cellforrowat
var a = ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
var temp = a
for (ind, _) in a.enumerated() {
if ind % 3 == 0 && ind != 0 {
temp.insert("current text", at: ind)
}
}
print(temp) // Prints ["a", "b", "c", "current text", "d", "e", "current text", "f", "g", "h", "i"]
Hello I am getting error "Missing '=' operator after key in hash literal." on the IF statement, where am I wrong
$Nests | ForEach-Object {
$RecordMetrics = [pscustomobject]#{
key = $_.key
count = $_.doc_count
if (key -like 'CBT99*')
{
bo = 'CBT'
SiteID = 1972
}
elseif
{
boperator = $map[$_.key.TrimEnd("1","2","3","4","5","6","7","8","9","0","-") ].boperator
SiteID = $map[$_.key.TrimEnd("1","2","3","4","5","6","7","8","9","0","-") ].SiteID
}
}}
You can't put a conditional statement in the middle of a hashtable literal like that.
You'll have to create the hashtable/dictionary first, then populate the relevant keys based on your conditional logic:
$Nests | ForEach-Object {
# create dictionary with initial properties
$properties = [ordered]#{
key = $_.key
count = $_.doc_count
Host = ''
OperatorName = ''
}
# conditionally add remaining properties
if ($_.key -like 'CBT99*') {
$properties['bo'] = 'CBT'
$properties['SiteID'] = 1972
}
else {
$properties['boperator'] = $map[$_.key.TrimEnd("1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-") ].boperator
$properties['SiteID'] = $map[$_.key.TrimEnd("1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-") ].SiteID
}
# convert to custom object
$RecordMetrics = [pscustomobject]$properties
}
I am trying to sort a [[Character]] array that has random characters put in to it so that it is all alphabetical. ex output for right now:
["H", "P", "C"]
["F", "K", "V"]
["J", "Y", "B"]
I need it to be like this
["A", "B", "C"]
["D", "E", "F"]
["G", "H", "I"]
Any Ideas?
Please check :
let input = [["H", "P", "C"], ["F", "K", "V"], ["J", "Y", "B"], ["A", "L"]]
var sortedArray = input.flatMap({ $0 }).sorted()
var finalArray:[[String]]=[]
var subArray:[String]=[]
for i in 0..<sortedArray.count {
subArray.append(sortedArray[i])
if subArray.count == 3 || i == sortedArray.count-1 {
finalArray.append(subArray)
subArray = []
}
}
print(finalArray)
// Output : [["A", "B", "C"], ["F", "H", "J"], ["K", "L", "P"], ["V", "Y"]]
func flattenArray(nestedArray: [[Character]]) -> [[Character]]{
var myFlattendArray = [Character]()
var sortedArray = [[Character]]()
for element in nestedArray{
if element is [Character]{
for char in element{
myFlattendArray.append(char)
}
}
}
myFlattendArray = myFlattendArray.sorted(by: {$0 < $1})
var arrayForArray = [Character]()
for i in 0..<myFlattendArray.count{
if((i % nestedArray.count == 0 && i != 0)){
sortedArray.append(arrayForArray)
arrayForArray.removeAll()
}else if i == myFlattendArray.count - 1{
arrayForArray.append(myFlattendArray[i])
sortedArray.append(arrayForArray)
arrayForArray.removeAll()
}
arrayForArray.append(myFlattendArray[i])
}
return sortedArray
}
You can use flatMap to flatten your array, sort it and then you can group using this extension from this answer as follow:
extension Array {
func group(of n: IndexDistance) -> Array<Array> {
return stride(from: 0, to: count, by: n)
.map { Array(self[$0..<Swift.min($0+n, count)]) }
}
}
let arr = [["H", "P", "C"],
["F", "K", "V"],
["J", "Y", "B"]]
let sorted = arr.flatMap{$0}.sorted().group(of: 3)
sorted // [["B", "C", "F"], ["H", "J", "K"], ["P", "V", "Y"]]
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I have a string let string = "!101eggs". Now, I want to have an array like this ["!", "101", "e", "g", "g", "s"]. How can I do this?
I presume the hard part for you is "Where's the number"? As long as this is just a simple sequence of digits, a regular expression makes it easy to find:
let string = "!101eggs"
let patt = "\\d+"
let reg = try! NSRegularExpression(pattern:patt)
let r = reg.rangeOfFirstMatch(in: string,
options: [],
range: NSMakeRange(0,string.utf16.count)) // {1,3}
So now you know that the number starts at position 1 and is 3 characters long. The rest is left as an exercise for the reader.
Sorry It's too long
when input is
print("-1-2a000+4-1/000!00005gf101eg14g1s46nj3j4b1j5j23jj212j4b2j41234j01010101g0000z00005g0000".toArrayByNumber())
Result: ["-", "1", "-", "2", "a", "000", "+", "4", "-", "1", "/", "000", "!", "00005", "g", "f", "101", "e", "g", "14", "g", "1", "s", "46", "n", "j", "3", "j", "4", "b", "1", "j", "5", "j", "23", "j", "j", "212", "j", "4", "b", "2", "j", "41234", "j", "01010101", "g", "0000", "z", "00005", "g", "0000"]
extension Int {
func toZeroString() -> String {
return (0 ..< self).reduce("", { (result, zero) -> String in
return result + "0"
})
}
}
extension String {
func toArrayByNumber() -> [String] {
var array: [String] = []
var num = 0
var zeroCount = 0
var zeroEnd = false
for char in self.characters {
if let number = Int("\(char)") {
if zeroEnd == false && number == 0 {
zeroCount += 1
} else {
num = num * 10 + number
zeroEnd = true
}
} else {
if num != 0 {
array.append(zeroCount.toZeroString() + ("\(num)"))
} else if zeroCount > 0 {
array.append(zeroCount.toZeroString())
}
array.append(String(char))
num = 0
zeroCount = 0
zeroEnd = false
}
}
if num != 0 {
array.append(zeroCount.toZeroString() + ("\(num)"))
} else if zeroCount > 0 {
array.append(zeroCount.toZeroString())
}
return array
}
}
Ok so heres the deal, I'm trying to make a function that checks if the amount of player moves is equal to a number with a factor of 12.
(like 12, 24, 36, and 48 and so on.)
This is what I've got so far:
//Changables
var playerMoves = 0
var solidNumbers =[ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "and So on"]
//Functions
func checkForPlayerMovesEqual12() {
//What a very long function name XD
if playerMoves / 12 == solidNumbers {
//Do this } else {
//Do this if else }
Another Explanation of what I'm trying to do:
So I'm trying to find out a way to check if the total Player Moves is divisible by 12 ( like 48/12 = 3 , and only to run if the answer has no decimals, so 3.0, 1.0 work & 2.4, 4,8 doesn't work) and if it is it will do
___.
Thanks, may have explained it a little confuzzling.
What you're looking for is the modulo operator.
Given integers a and b, the result of a % b will give you c would would be the remainder if you did integer division.
For example:
15 % 12 // 3
12 % 12 // 0
6 % 12 // 6
17 % 12 // 5
24 % 12 // 0
33 % 12 // 9
So if you want to find even multiples of 12, just look for any case where variable % 12 == 0.
Your condition should test to see if division by 12 leaves no remainder. In code, that would look like this:
if playerMoves % 12 == 0 {
// do this
} else {
// do something else
}
You do not need your solidNumbers array.