ios - How to sort 1 array in Swift / Xcode and reorder multiple other arrays by the same keys changes -

sorry complex wording of question. main experience php , has command called array_multisort. syntax below:

bool array_multisort ( array &$array1 [, mixed $array1_sort_order = sort_asc [, mixed $array1_sort_flags = sort_regular [, mixed $... ]]] ) 

it lets sort 1 array , reorder multiple other arrays based on key changes in original.

is there equivalent command in swift / xcode 7.2?

i have have set of arrays:

firstname age city country active

active array of time in seconds user has been active within app. order descending or ascending , other arrays change remain consistent.

you create array of indexes in sorted order , use mapping:

var names = [ "paul", "john", "david" ] var ages  = [  35,    42,     27 ]  let neworder = names.enumerate().sort({$0.1<$1.1}).map({$0.0})  names = neworder.map({names[$0]}) ages  = neworder.map({ages[$0]}) 

[edit] here's improvement on technique :

it's same approach sorting , assignment in 1 step. (can reassigned original arrays or separate ones)

(firstnames,ages,cities,countries,actives) =      {(         $0.map{firstnames[$0]},         $0.map{ages[$0]},         $0.map{cities[$0]},        $0.map{countries[$0]},         $0.map{actives[$0]}      )}      (firstnames.enumerated().sorted{$0.1<$1.1}.map{$0.0}) 

[edit2] , array extension make easier use if sorting in place:

extension array element:comparable {    func ordering(by order:(element,element)->bool) -> [int]    { return self.enumerated().sorted{order($0.1,$1.1)}.map{$0.0} } }  extension array  {    func reorder<t>(_ otherarray:inout [t]) -> [element]     {       otherarray = self.map{otherarray[$0 as! int]}       return self    } }   firstnames.ordering(by: <)           .reorder(&firstnames)           .reorder(&ages)           .reorder(&cities)           .reorder(&countries)           .reorder(&actives) 

combining previous two:

extension array {    func reordered<t>(_ otherarray:[t]) -> [t]     {       return self.map{otherarray[$0 as! int]}    } }  (firstnames,ages,cities,countries,actives) =      {(         $0.reordered(firstnames),         $0.reordered(ages),         $0.reordered(cities),        $0.reordered(countries),         $0.reordered(actives)      )}      (firstnames.ordering(by:<))