make an array from custom object properties

Question

I have a custom class like:

 class Tender: NSObject {
     public var code = ""
     public var name = ""
 }

A method returns an array of Tender type. From this array, I want to prepare an array that contains only name. Example,

 public func fetchTenderArray() -> [Tender] {
      var tenderArray = [Tender]()
      let tender1 = Tender()
      tender1.code = "t1"
      tender1.name = "tenderName1"
      let tender2 = Tender()
      tender2.code = "t2"
      tender2.name = "tenderName2"
      tenderArray.append(tender1)
      tenderArray.append(tender2)
      return tenderArray
 }

Now, I have a method that uses this tenderArray. I need to form an array with the names of [Tender].

 public func formTenderNamesArray() -> [String] {
      let tenderArray = fetchTenderArray()
      var tenderNames = [String]()
      for tender in tenderArray {
           tenderNames.append(tender.name)
      }
      return tenderNames    // returns ["tenderName1","tenderName2"]
 }

Is there a short and a best way to prepare that array of strings using swift3?

Ever thought of using a hashmap or dictionary for storing the code (=key) and name (=value)? — Uwe Allner
– Uwe Allner, Commented Aug 2, 2017 at 7:51

Kiester · Accepted Answer · 2017-08-02 07:59:14Z

1

Try using map functionality,

it should be something like this.

let tenderArray = fetchTenderArray()
let tenderNames = tenderArray.map {$0.name}

For more information please see this link.

https://useyourloaf.com/blog/swift-guide-to-map-filter-reduce/

answered Aug 2, 2017 at 7:59

Kiester

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Comments

Berlin Raj · Accepted Answer · 2017-08-02 10:16:02Z

0

//Try this

public func formTenderNamesArray() -> [String] {
    let tenderArray = fetchTenderArray()
    var tenderNames = (tenderArray as! NSArray).value(forKey: "name") as! [String]
    return tenderNames
}

answered Aug 2, 2017 at 10:16

Berlin Raj

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