Array within Array Swift - ios

Question

I have an array as below with 13 items.
var data =[“MonthFolder/",
"MonthFolder/January",
"MonthFolder/February",
"MonthFolder/March",
"DayFolder/",
"DayFolder/Monday",
"DayFolder/Tuesday",
"DayFolder/Wednesday",
"DayFolder/Thursday",
"YearFolder/",
"YearFolder/2016",
"YearFolder/2015",
"YearFolder/2014"]
I am trying to print an array with end result as below
[("MonthFolder/January","MonthFolder/February","MonthFolder/March"),
("DayFolder/Monday","DayFolder/Tuesday","DayFolder/Wednesday","DayFolder/Thursday"),
("YearFolder/2016", "YearFolder/2015”, "YearFolder/2014")]”
I have done this
var fileName = [AnyObject]()
var allFiles = [AnyObject]()
for item in data{
let keyString = item.characters.last
if keyString != "/"{
fileName.append(item)
}
else if keyString == "/"{
if fileName.count > 0{
allFiles.append(fileName)
fileName = []
}
}
}
and got the output as
[("MonthFolder/January","MonthFolder/February","MonthFolder/March"),
("DayFolder/Monday","DayFolder/Tuesday","DayFolder/Wednesday","DayFolder/Thursday”)]
missing the third object in the allFiles because the else if condition fails for the last iteration. How do i achieve my desired output? Thank you.

Answer 1

By this way you will get expected output :
var fileName = [AnyObject]()
var allFiles = [AnyObject]()
for item in data{
let keyString = item.characters.last
if keyString != "/"{
fileName.append(item)
}
else if keyString == "/"{
if fileName.count > 0{
allFiles.append(fileName)
fileName = []
}
}
}
if fileName.count != 0 {
allFiles.append(fileName)
fileName = []
}
Hope this will help you :)

Answer 2

Try this
data.forEach { (item) -> () in
if item.characters.last != "/" {
fileName.append(item)
} else if fileName.count > 0 {
allFiles.append(fileName)
fileName = []
}
}
allFiles.append(fileName)
print(allFiles)

Answer 3

I have tried this
var data = ["MonthFolder/", "MonthFolder/January", "MonthFolder/February", "MonthFolder/March", "DayFolder/", "DayFolder/Monday", "DayFolder/Tuesday", "DayFolder/Wednesday", "DayFolder/Thursday", "YearFolder/", "YearFolder/2016", "YearFolder/2015", "YearFolder/2014"];
var fileName = []
for (item in data) {
var keyString = data[item].split("/");
if(keyString[1] == "")
{
var keyV = keyString[0];
fileName[keyV]= new Array();
}
else
{
fileName[keyV].push(data[item]);
}
}
console.log(fileName)
and i got output like
[
DayFolder
["DayFolder/Monday", "DayFolder/Tuesday", "DayFolder/Wednesday", "DayFolder/Thursday"]
MonthFolder
["MonthFolder/January", "MonthFolder/February", "MonthFolder/March"]
YearFolder
["YearFolder/2016", "YearFolder/2015", "YearFolder/2014"]
]
Please check

Answer 4

Functional way:
var data = ["MonthFolder/",
"MonthFolder/January",
"MonthFolder/February",
"MonthFolder/March",
"DayFolder/",
"DayFolder/Monday",
"DayFolder/Tuesday",
"DayFolder/Wednesday",
"DayFolder/Thursday",
"YearFolder/",
"YearFolder/2016",
"YearFolder/2015",
"YearFolder/2014"]
var allFolders = [String]()
var allFiles = [String]()
func gatherFiles(files: [String], inFolders folders: [String]) -> [[String]] {
return folders.map { folder in
return (files.filter { $0.containsString(folder)})
}
}
for item in data {
let components = item.componentsSeparatedByString("/").filter({!$0.isEmpty})
if components.count > 1 {
allFiles.append(item)
} else {
allFolders.append(item)
}
}
let finalArr = gatherFiles(allFiles, inFolders: allFolders)
Note
Cons: with this way, there's more iterations.
Pros: You could reuse it ?

Answer 5

You can also use more generic approach based on Dictionary struct
var filesDict = [String : [String]]()
for fileName in data {
let fileComponents = fileName.componentsSeparatedByString("/")
let fileKey = fileComponents[0]
let fileValue = fileComponents[1]
var itemsArray = filesDict[fileKey]
if itemsArray == nil {
itemsArray = []
}
if fileValue != "" {
itemsArray!.append(fileName)
}
filesDict[fileKey] = itemsArray
}
//conversion from Dictionary to Array
let outputArray = Array(filesDict.values)
print(outputArray)
output
[["MonthFolder/January", "MonthFolder/February", "MonthFolder/March"],
["DayFolder/Monday", "DayFolder/Tuesday", "DayFolder/Wednesday", "DayFolder/Thursday"],
["YearFolder/2016", "YearFolder/2015", "YearFolder/2014"]]