I want to order an array with the help of another, like this:
var names = [anna, berta, caesar, dora]
var sorting = [2, 0, 1, 3]
to be sorted like this:
var sortedNames = [caesar, anna, berta, dora]
so that the Integer array ("sorting") sorts the String array ("names") after its own values. How can I do that?
I tried it with a for loop, but it didn't worked.
for i in 0...names.count
{
let x = "\(names[sorting]])"
sortedNames.append(x)
}
return history
You can use the map() function to transform the values of sorting:
var names = ["anna", "berta", "caesar", "dora"]
var sorting = [2, 0, 1, 3]
let sortedNames = sorting.map({ names[$0] }) // ["caesar", "anna", "berta", "dora"]
Keep in mind that this solution only works if the values in
sortingare valid indices for thenamesarray.
sorting.map { names[$0] }
sorting array contains a number that is not a valid index for the first array, you would get "Fatal error: Index out of range".You can create a new object which has properties the names and sorting
var name: String!
var sorting: Int!
Then you can easily sort your array of objects like this
array.sort(by: {$0.sorting<$1.sorting})
In this way you will have for each name sorting value and it will be pretty easy to do any manipulations with it.
var names = [anna, berta, caesar, dora]
var sorting = [2, 0, 1, 3]
Simple approach with for loop is to select the values from sorting array and treat them as index to get respective value from names array.
var sortedNames = [String]()
for i in 0..<sorting.count {
let x = sortedNames[i]
sortedNames.append(x)
}
return sortedNames // [caesar, anna, berta, dora]
names? is it array of strings?