Hi guys I want to ask how do you search the items for the nearest possible similar value regarding of the sequence. Example as below when I search for ["Restaurant","Bull"], it should return me str2 is the possible nearest values. Because this function only able to work for order sequence, it cannot for non-sequence. I really hope you guys can help me out....
func search(`for` searchItems: Set<String>, `in` searchArea: [Set<String>]) -> Set<String>? {
return searchArea.max(by: { (a, b) -> Bool in
return searchItems.intersection(a).count < searchItems.intersection(b).count || searchItems.intersection(a).count > searchItems.intersection(b).count
})
}
let str2: Set<String> = ["Bull","Restaurant","Corner"]
let str3: Set<String> = ["Corner","Restaurant","Mole"]
let area = [str3, str2] as [Any]
print("search result",self.search(for: ["Restaurant","Bull"], in: area as! [Set<String>]))
Probably because your str2 and str3 is not Set at all, it's array coz you are using array declaration, thus change it to this then it works if you use ["Bull", "Restaurant"]:
let str2 = Set(["Bull","Restaurant","Corner"])
let str3 = Set(["Corner","Restaurant","Mole"])
Also, Set is non-ordered sequence, Array is ordered sequence
Just make a set out of your query array and use its isSubset(of:) method to check wether it's a subset of your data.
let set1 = Set([1,2,3])
let set2 = Set([2,3,4])
let query = [1,2]
let querySet = Set(query)
querySet.isSubset(of: set1) // true
querySet.isSubset(of: set2) // false
let query2 = [2,1]
let querySet2 = Set(query)
querySet2.isSubset(of: set1) // true
querySet2.isSubset(of: set2) // false
Related
Currently, I'm having a problem comparing an array with a string. I have 2 arrays and want to find out if the elements in those 2 arrays are in the string
let resultString = "STEREON10.000 4ailthameGrinreD NOCHIMINNICHNUÖC-LOINHÀ GIAIDACBIET2ty UnOMMOSTCRShitConDONG FlimChineCrJ045 Dòketquásoan: XSHCM goi 7181 8186-8110°593364THUBAY6A7 05-6-2021teIntaiKNInTaiChínhTP.HCM"
let code_province:[String] = ["xsag", "xsbd", "xsbdi", "xsbl","xsbp",
"xsbt", "xsbth", "xscm", "xsct", "xsdl",
"xsdlk", "xsdn", "xsdng", "xsdno", "xsdt",
"xsgl", "xshcm", "xshg", "xskg", "xskh",
"xskt", "xsla", "xsmb", "xsnt", "xspy",
"xsqb", "xsqng", "xsqnm", "xsqt", "xsst",
"xstg", "xstn", "xstth", "xstv", "xsvl",
"xsvt", "xsbri",]
let name_Province:[String] = ["angiang","binhduong","binhdinh","baclieu", "binhphuoc","bentre", "binhthuan", "camau", "cantho", "dalat","daklak", "dongnai", "daNang", "daknong", "dongthap","gialai", "hcm", "haugiang", "kiengiang", "khanhhoa","kontum", "longan", "mienbac", "ninhthuan", "phuyen","quangbinh", "quangNgai", "quangnam", "quangtri", "soctrang","tiengiang", "tayninh", "thuat.hue", "travinh", "vinhlong","vungtau","baria"]
Here is one way:
let f: (String) -> String? = { resultString.localizedStandardContains($0) ? $0 : nil }
let provincesInResult = code_province.compactMap(f)
let namesInResult = name_Province.compactMap(f)
We map the list of things to search for from a list of strings, to nil if not found and the string if found. Then we compact the result to leave us with just a list of the found ones. That may be 0, 1 or more, so consider those possibilities.
I just want to create a dictionary with the help of for loop
sample code :
var counter: Int = 1;
var pageCountDict = [String:Any]();
for filterCount in counter..<6
{
if let count = "page_\(filterCount)_vtime" as? String
{
pageCountDict = [count: timeInterval_Int];
}
}
print(pageCountDict);
This print command give me only last value of forloop
I just want all the value of this variable pageCountDict in a dictonary
The way to assign to a dictionary is first use the subscript and assign the value to it:
pageCountDict[YourKey] = YourValue
Also, you can see many examples and explanations in Apple documentation regarding dictionaries.
With each loop, you are replacing the dictionary with one that contains only one element. What you want to do is this :
pageCountDict[count] = timeInterval_Int
Also, you shouldn't need the as? String part. This should be sufficient :
for filterCount in counter..<6
{
pageCountDict[count] = "page_\(filterCount)_vtime"
}
var pageCountDict = [String:Any]()
You can add values to this dictionary by merging previous contents and new data as follows...
let counter: Int = 1
var pageCountDict = [String:Any]()
for filterCount in counter..<6
{
let value = 9
let count = "page_\(filterCount)_vtime" //'if' is not needed as it is always true
pageCountDict.merge([count: timeInterval_Int], uniquingKeysWith:{ (key, value) -> Any in
//assign value for similar key
timeInterval_Int
})
}
print(pageCountDict)`
Here I am just getting array count and using for loop but got crashed at let arr = arrayAdaptor[i] this line after completing my array count don't know why it's crashing can anyone help me how to resolve this
var arrayAdaptor = [Struct_Row_Rating]()
for i in 0...arrayAdaptor.count {
let arr = arrayAdaptor[i]
let number = arr.row
let row = number + 1
dict.updateValue("\(arr.rating)", forKey: "\(row)")
print(dict)
}
struct Struct_Row_Rating {
var row: Int
var rating: Double
init(row: Int , rating: Double) {
self.row = row
self.rating = rating
}}
The operator ... exceeds the range of the array. You have to write
for i in 0..<arrayAdaptor.count
or
for i in 0...arrayAdaptor.count - 1
Basically don't use these index based for loops in Swift at all.
Use Fast Enumeration:
for arr in arrayAdaptor {
and if you really need the index
for (index, arr) in arrayAdaptor.enumerated() {
Why you are using 0...arrayAdaptor.count range style avoid it and Simply Use enumerated() of an Array:
for (_,value) in arrayAdaptor.enumerated() {
let number = value.row
let row = number + 1
dict.updateValue("\(arr.rating)", forKey: "\(row)")
print(dict)
}
If you don't want any index to try with this:
for value in arrayAdaptor {
let number = value.row
let row = number + 1
dict.updateValue("\(arr.rating)", forKey: "\(row)")
print(dict)
}
See this
One of the options not mentioned in the answers is forEach approach.
arrayAdaptor.forEach { item in
print(item)
}
or
arrayAdaptor.forEach {
print($0) // without named parameter
}
// Your case:
arrayAdaptor.forEach { item in
let arr = item
let number = item.row
let row = number + 1
dict.updateValue("\(arr.rating)", forKey: "\(row)")
print(dict)
}
This is pretty much the same as the handy for..in mentioned in vadian's answer:
for arr in arrayAdaptor { ... }
From Swift 4 you can use One sided ranges.
i... is favored over i..< because the latter is ugly. We have to pick one, two would be redundant and likely to cause confusion over which is the "right" one. Either would be reasonable on pedantic correctness grounds – (i as Int)... includes Int.max consistent with ..., whereas a[i...] is interpreted as a[i..<a.endIndex] consistent with i..<.
Example:
var names = ["Jack", "New", "peter"]
let first = names[0...]
let second = names[..<names.count]
print(first)//prints ["Jack", "New", "peter"]
print(second)//prints ["Jack", "New", "peter"]
You can also iterate loop by 'map' function:
let _ = arrayAdaptor.map({ adaptor in
let number = adaptor.row
let row = number + 1
dict.updateValue("\(adaptor.rating)", forKey: "\(row)")
print(dict)
})
I have this string which is part of a larger string with multiple occurrences of "content" and "/content": I want to capture the whole string between "content ..." and "/content".
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">RATING: ★★★★<br/>
TAGS: Fiction, General, Science Fiction<br/>
SERIES: 20 SienceFiction Greats [19]<br/>
<p class="description">SUMMARY:<br/>Luna is an open colony and the regime is a harsh one....</p></div>
</content>
I want to capture all between "content type="xhtml"" and "/content"
I tried this code:
let regexPattern = "<content type=\"xhtml\">.*</content>"
let result:[String] = matches(for: regexPattern, in: dataString)
but it returns an empty array.
Your regex pattern is close. You do not have any capturing groups within the regex. A capturing group is defined as any pattern between (). So with a little adjustment of the regex you will get a match. The updated Regex should look like this:
let regexPattern = "<content type=\"xhtml\">(.*)<\/content>"
Well I found a solution as the .* pattern captures everything from the first occurrence of "content" to the last occurrence of "/content".
so this is my solution: get an array of "content" occurrences and an array of "/content" occurrences, from these arrays I can calculate the ranges I need from the string
private func getXHTMLContentFromDataString(dataString: String) -> [String] {
var contentStringArray: [String] = []
let startString: String = "<content type=\"xhtml\">"
let endString: String = "</content>"
var isFound = true
var currentString = dataString
while isFound == true && currentString.characters.count > 0 {
if let contentStartRange = currentString.range(of: startString), let contentEndRange = currentString.range(of: endString) {
isFound = true
let contentStr: String = currentString[contentStartRange.upperBound .. < contentEndRange.lowerBound]
contentStringArray.append(contentStr)
currentString = currentString[contentEndRange.upperBound .. <currentString.endIndex]
} else {
isFound = false
}
}
return contentStringArray
}
is there a possibility to get an object from an array with an specific property? Or do i need to loop trough all objects in my array and check if an property is the specific i was looking for?
edit: Thanks for given me into the correct direction, but i have a problem to convert this.
// edit again: A ok, and if there is only one specific result? Is this also a possible method do to that?
let imageUUID = sender.imageUUID
let questionImageObjects = self.formImages[currentSelectedQuestion.qIndex] as [Images]!
// this is working
//var imageObject:Images!
/*
for (index, image) in enumerate(questionImageObjects) {
if(image.imageUUID == imageUUID) {
imageObject = image
}
}
*/
// this is not working - NSArray is not a subtype of Images- so what if there is only 1 possible result?
var imageObject = questionImageObjects.filter( { return $0.imageUUID == imageUUID } )
// this is not working - NSArray is not a subtype of Images- so what if there is only 1 possible result?
You have no way to prove at compile-time that there is only one possible result on an array. What you're actually asking for is the first matching result. The easiest (though not the fastest) is to just take the first element of the result of filter:
let imageObject = questionImageObjects.filter{ $0.imageUUID == imageUUID }.first
imageObject will now be an optional of course, since it's possible that nothing matches.
If searching the whole array is time consuming, of course you can easily create a firstMatching function that will return the (optional) first element matching the closure, but for short arrays this is fine and simple.
As charles notes, in Swift 3 this is built in:
questionImageObjects.first(where: { $0.imageUUID == imageUUID })
Edit 2016-05-05: Swift 3 will include first(where:).
In Swift 2, you can use indexOf to find the index of the first array element that matches a predicate.
let index = questionImageObjects.indexOf({$0.imageUUID == imageUUID})
This is bit faster compared to filter since it will stop after the first match. (Alternatively, you could use a lazy sequence.)
However, it's a bit annoying that you can only get the index and not the object itself. I use the following extension for convenience:
extension CollectionType {
func find(#noescape predicate: (Self.Generator.Element) throws -> Bool) rethrows -> Self.Generator.Element? {
return try indexOf(predicate).map({self[$0]})
}
}
Then the following works:
questionImageObjects.find({$0.imageUUID == imageUUID})
Yes, you can use the filter method which takes a closure where you can set your logical expression.
Example:
struct User {
var firstName: String?
var lastName: String?
}
let users = [User(firstName: "John", lastName: "Doe"), User(firstName: "Bill", lastName: "Clinton"), User(firstName: "John", lastName: "Travolta")];
let johns = users.filter( { return $0.firstName == "John" } )
Note that filter returns an array containing all items satisfying the logical expression.
More info in the Library Reference
Here is a working example in Swift 5
class Point{
var x:Int
var y:Int
init(x:Int, y:Int){
self.x = x
self.y = y
}
}
var p1 = Point(x:1, y:2)
var p2 = Point(x:2, y:3)
var p3 = Point(x:1, y:4)
var points = [p1, p2, p3]
// Find the first object with given property
// In this case, firstMatchingPoint becomes p1
let firstMatchingPoint = points.first{$0.x == 1}
// Find all objects with given property
// In this case, allMatchingPoints becomes [p1, p3]
let allMatchingPoints = points.filter{$0.x == 1}
Reference:
Trailing Closure
Here is other way to fetch particular object by using object property to search an object in array.
if arrayTicketsListing.contains({ $0.status_id == "2" }) {
let ticketStatusObj: TicketsStatusList = arrayTicketsListing[arrayTicketsListing.indexOf({ $0.status_id == "2" })!]
print(ticketStatusObj.status_name)
}
Whereas, my arrayTicketsListing is [TicketsStatusList] contains objects of TicketsStatusList class.
// TicketsStatusList class
class TicketsStatusList {
internal var status_id: String
internal var status_name: String
init(){
status_id = ""
status_name = ""
}
}