Can I add dictionary arrays (is this the correct term for a dictionary key holding multiple values?) to an array?
var dictionary = [String: [String]]()
var array = [String]()
var data1:String = "55a"
var data2:String = "95a"
var data3:String = "66"
var data4:String = "25"
var data5:String = "88b"
var data6:String = "#"
dictionary["3"] = [data1, data2, data3, data4, data5, data6]
var data7:String = "#"
var data8:String = "#"
var data9:String = "#"
var data10:String = "#"
var data11:String = "#"
var data12:String = "#"
dictionary["2"] = [data7, data8, data9, data10, data11, data12]
var data13:String = "100"
var data14:String = "101"
var data15:String = "102"
var data16:String = "103"
var data17:String = "104"
var data18:String = "105"
dictionary["1"] = [data13, data14, data15, data16, data17, data18]
I tried this:
array.extend([dictionary["1"], dictionary["2"], dictionary["3"]])
but there was an error "Cannot invoke 'extend' with an argument list of type '([[(String)?])"..
How do I add dictionary["1"], ["2"] & ["3"] accordingly into the array?
Your array type declaration is not correct. Please try below one
var array: [[String:[String]] = []
In case you are not interested in the order you might try:
array.extend(flatMap(dictionary.values, {$0}))
If order is important you might build your optionalArrays first:
let optionalArrays = [dictionary["1"], dictionary["2"], dictionary["3"]]
array.extend(flatMap(optionalArrays, {$0 ?? []}))
i.e. your dictionary returns an optional array, this causes the error you reported.
Hope this helps
If you wanted an array of arrays of Strings, you need to change your array's type to be [[String]], as the other answers said.
But, when getting values out of your dictionary, you shouldn't force unwrap! It may work for this example, but in the future you'll likely get into trouble with:
'fatal error: unexpectedly found nil while unwrapping an Optional
value'
You should check to see if a value exists in the dictionary for that key, using optional binding for example:
if let value = dictionary["1"] {
array.append(value)
}
// ...
Or, you could get all the values from your dictionary into an array like so:
let array = Array(dictionary.values)
If you actually did want an array of Strings, you could use flatMap:
let array = flatMap(dictionary.values) { $0 }
Your array variable must be an Array of Array with String elements.
Also don't forget to unwrap the values of the dictionaries by adding !.
Try this:
var dictionary = [String: [String]]()
var array = [[String]]()
var data1:String = "55a"
var data2:String = "95a"
var data3:String = "66"
var data4:String = "25"
var data5:String = "88b"
var data6:String = "#"
dictionary["3"] = [data1, data2, data3, data4, data5, data6]
var data7:String = "#"
var data8:String = "#"
var data9:String = "#"
var data10:String = "#"
var data11:String = "#"
var data12:String = "#"
dictionary["2"] = [data7, data8, data9, data10, data11, data12]
var data13:String = "100"
var data14:String = "101"
var data15:String = "102"
var data16:String = "103"
var data17:String = "104"
var data18:String = "105"
dictionary["1"] = [data13, data14, data15, data16, data17, data18]
array.extend([dictionary["1"]!, dictionary["2"]!, dictionary["3"]!])
Dictionary values are returned as optionals (thus indicating if a value exists for a key) so use the '!' to unwrap the values of each dictionary array (i.e. [dictionary["1"]!)
And as suggested in other answers change your array type as it currently defined as arrays of string rather then an array of dictionaries.
Related
I have two Array with different Data Types
Assume Array1 is an [String] array of String
Assume Array 2 is an [Custom Objects] array of Struct
Pls find a code
struct ScanData{
var serialNo : String!
var intNo : String!
init(serialNo : String, intNo : String) {
self.serialNo = serialNo
self.intNo = intNo
}
}
var validScannedData : [String] = []
var inValidScannedData : [String] = []
var arrayObj = [ScanData(serialNo: "12220116033", intNo: "SN6AT4.270"),ScanData(serialNo: "12198144025", intNo: "SN6AT4.280"),ScanData(serialNo: "12222383027", intNo: "SN6AT4.130"),ScanData(serialNo: "12198213032", intNo: "SN6AT5.260"),ScanData(serialNo: "", intNo: "")]
//print(arrayObj)
//ScanData(serialNo: "12199690049", intNo: "SN6AT6U100")
var localArray = ["12220116033","12198144025","12222383027","12198213032","12199690049"]
let tempArray = arrayObj.filter { data in
return data.serialNo != "" || data.intNo != ""
}
print(tempArray.count)
Now we want to get common values from localArray and tempArray by matching serialNo key
Finally i want to have Array of String Format in validScannedData object
Expected Output :
Valid data : ["12220116033","12198144025","12222383027","12198213032"]
Invalid data : ["12199690049"]
I tried this but its prints custom object array
let a = tempArray.filter () { localArray.contains($0.serialNo) }
print(a)
Thanks in advance
Use forEach to iterate your element and then check and append to the according to array.
localArray.forEach { number in
arrayObj.contains(where: {$0.serialNo == number}) ? validScannedData.append(number) : inValidScannedData.append(number)
}
print(validScannedData)
print(inValidScannedData)
I have a dictionary of var tags = [String:[String]](). When returning the values to the REST endpoint I need to merge all the values in [String] array. Can I do something with using
self.tags.map { $0.value }
But no clue how to get a single array using all the values arrays from dictionary.
Yes you can do that using flatMap
var tags = [String:[String]]()
tags["1"] = ["2","3"]
tags["2"] = ["4","5"]
let arr = tags.values.flatMap{$0}
OR
let arr = tags.flatMap(\.value)
Prints
print(arr) // ["2","3","4","5"]
You can use flatMap to achieve this:
var tags = [String:[String]]()
var values = tags.flatMap { $0.value }
// or using keypath
var values = tags.flatMap(\.value)
Or use flatMap on values like this:
var values = tags.values.flatMap{$0}
I have an array of type "drugList", and they are derived from a struct "DrugsLibrary":
struct DrugsLibrary {
var drugName = ""
var drugCategory = ""
var drugSubCategory = ""
}
var drugList = [DrugsLibrary]()
//This is the dictionary i'm trying to build:
var dictionary = ["": [""," "]]
My data model is initialized using this function:
func createDrugsList() {
var drug1 = DrugsLibrary()
drug1.drugName = "drug1"
drug1.drugCategory = "Antibiotics"
drug1.drugSubCategory = "Penicillins"
self.drugList.append(drug1)
var drug2 = DrugsLibrary()
drug2.drugName = "drug2"
drug2.drugCategory = "Antibiotics"
drug2.drugSubCategory = "Penicillins"
self.drugList.append(drug2)
var drug3 = DrugsLibrary()
drug3.drugName = "drug2"
drug3.drugCategory = "Antibiotics"
drug3.drugSubCategory = "Macrolides"
self.drugList.append(drug3)
}
my problem is that i'm trying to create a dictionary from the drugList where the key is the drugSubCategory and the value is the drug name. The value should be an array if there are several drugs in this subcategory
for example, the dictionary should look something like this for this example:
dictionary = [
"Penicillins": ["drug1","drug2"]
"Macrolides": ["drug3"]
]
I tried this method:
for item in drugList {
dictionary["\(item.drugSubCategory)"] = ["\(item.drugName)"]
}
this gave a dictionary like this, and it couldn't append drug2 to "Penicllins":
dictionary = [
"Penicillins": ["drug1"]
"Macrolides": ["drug3"]
]
So I tried to append the items into the dictionary using this method but it didn't append anything because there were no common items with the key "" in the data model:
for item in drugList {
names1[item1.drugSubCategory]?.append(item1.drugName)
}
Anyone knows a way to append drug2 to the dictionary?
I would appreciate any help or suggestion in this matter.
You need to create a new array containing the contents of the previous array plus the new item or a new array plus the new item, and assign this to your dictionary:
for item in drugList {
dictionary[item.drugSubCategory] = dictionary[item.drugSubCategory] ?? [] + [item.drugName]
}
You can use .map and .filter and Set to your advantage here. First you want an array of dictionary keys, but no duplicates (so use a set)
let categories = Set(drugList.map{$0.drugSubCategory})
Then you want to iterate over the unique categories and find every drug in that category and extract its name:
for category in categories {
let filteredByCategory = drugList.filter {$0.drugSubCategory == category}
let extractDrugNames = filteredByCategory.map{$0.drugName}
dictionary[category] = extractDrugNames
}
Removing the for loop, if more Swifty-ness is desired, is left as an exercise to the reader ;).
I have two unrelated observations:
1) Not sure if you meant it as an example or not, but you've initialized dictionary with empty strings. You'll have to remove those in the future unless you want an empty strings entry. You're better off initializing an empty dictionary with the correct types:
var dictionary = [String:[String]]()
2) You don't need to use self. to access an instance variable. Your code is simple enough that it's very obvious what the scope of dictionary is (see this great writeup on self from a Programmers's stack exchange post.
Copy this in your Playground, might help you understand the Dictionaries better:
import UIKit
var str = "Hello, playground"
struct DrugsLibrary {
var drugName = ""
var drugCategory = ""
var drugSubCategory = ""
}
var drugList = [DrugsLibrary]()
//This is the dictionary i'm trying to build:
var dictionary = ["":""]
func createDrugsList() {
var drug1 = DrugsLibrary()
drug1.drugName = "drug1"
drug1.drugCategory = "Antibiotics"
drug1.drugSubCategory = "Penicillins"
drugList.append(drug1)
var drug2 = DrugsLibrary()
drug2.drugName = "drug2"
drug2.drugCategory = "Antibiotics"
drug2.drugSubCategory = "Penicillins"
drugList.append(drug2)
var drug3 = DrugsLibrary()
drug3.drugName = "drug2"
drug3.drugCategory = "Antibiotics"
drug3.drugSubCategory = "Macrolides"
drugList.append(drug3)
}
createDrugsList()
print(drugList)
func addItemsToDict() {
for i in drugList {
dictionary["item \(i.drugSubCategory)"] = "\(i.drugName)"
}
}
addItemsToDict()
print(dictionary)
(I'm not using Swift 2.0 at the time.)
I have multiple arrays inside a master array. I need them in alphabetical order by variable name, and I can't figure out how to sort anything other than Strings inside an array. These are my arrays:
var onDeck1 = [String]()
var onDeck2 = [String]()
var onDeck3 = [String]()
var onDeck4 = [String]()
My problem is that I keep running into something like this:
var masterArray = [onDeck1, onDeck4, onDeck3, onDeck2]
When I need this:
var masterArray = [onDeck1, onDeck2, onDeck3, onDeck4]
Anybody know what I need to do?
Try the following approach:
// var masterArray = [ onDeck1, onDeck4, onDeck3,onDeck2]
var masterArray = [ "Babisko", "Kapisko", "Hapisko"];
var sortedArray = masterArray.sorted { $0.localizedCaseInsensitiveCompare($1) == NSComparisonResult.OrderedAscending }
How to get the first element value of the splitted array
var supplierpofileselection = $("[id$='_SelectedTabIdsHiddenField']").val();
var arr = supplierpofileselection.split(';');
var arrfirst = arr.first();
alert (arrfirst);
List is random.
You need to use index to access the element of array.
Change
var arrfirst = arr.first();
To
var arrfirst = arr[0];
Split method returns an array of substrings. So use indexes 0,1,2... to access value.
var supplierpofileselection = $("[id$='_SelectedTabIdsHiddenField']").val();
var arr = supplierpofileselection.split(';');
var arrfirst = arr[0];
alert (arrfirst);