Search in NSMutableArray - swift

Question

I am wanted to make a search on NSMUtableArray with key values to catch the hole object not just an array of values so for example my NSMUtableArray return me
{id : 1, name : x1}
{id : 2, name : x2}
{id : 3, name : x3}
{id : 4, name : y1}
{id : 5, name : y2}
if I am searching of x my code return me
{x1,x2,x3}
or I want it to return
{id : 1, name : x1}
{id : 2, name : x2}
{id : 3, name : x3}
my code is :
let arrayy = lstResults.value(forKey: "name")
let searchTest = NSPredicate(format: "SELF BEGINSWITH [c] %#", searchBar.text!)
let array = (arrayy as! NSArray).filtered(using: searchTest)
filteredTableDataName = array as NSArray
please help I tried a lot of stuff but nothing worked form me.

Answer 1

Instead of extracting and filtering the "name" values you can filter the array directly, using the corresponding key path instead of “SELF” in the predicate:
let array = NSArray(array: [
["id": 1, "name": "x1"], ["id": 2, "name": "x2"], ["id": 3, "name": "y3"]])
let predicate = NSPredicate(format: "name BEGINSWITH [c] %#", "x")
let filtered = array.filtered(using: predicate)
print(filtered)
Result:
[{
id = 1;
name = x1;
}, {
id = 2;
name = x2;
}]
Another option is to cast the NS(Mutable)Array to a Swift array of dictionaries, and use the filter() function:
if let a = array as? [[String: Any]] {
let filtered = a.filter {
($0["name"] as? String)?
.range(of: "x", options: [.caseInsensitive, .anchored]) != nil
}
print(filtered)
// [["id": 1, "name": x1], ["name": x2, "id": 2]]
}

Answer 2

NSMutableArray (or NSArray for that matter) are leftovers from the 'Objective-c' era.
For this purpose there is not real need using it or not using Swift's standard generic Array<Element> => https://developer.apple.com/documentation/swift/array
Might I consider creating a struct instead of using a dictionary:
import Foundation
struct Obj {
let id: Int
let name: String
}
let array = [
Obj(id: 1, name: "x1"),
Obj(id: 2, name: "x2"),
Obj(id: 3, name: "X3"),
Obj(id: 4, name: "y1"),
Obj(id: 5, name: "y2")
]
let filteredArray = array.filter { $0.name.localizedLowercase.hasPrefix("x") }
// filteredArray = [
// Obj(id: 1, name: "x1"),
// Obj(id: 2, name: "x2"),
// Obj(id: 3, name: "X3")
// ]
Else you would have something like this:
import Foundation
let array: [[String: Any]] = [
[ "id": 1, "name": "x1" ],
[ "id": 2, "name": "x2" ],
[ "id": 3, "name": "X3" ],
[ "id": 4, "name": "y1" ],
[ "id": 5, "name": "y2" ]
]
let filteredArray = array.filter { ($0["name"] as? String)?.localizedLowercase.hasPrefix("x") == true }