Join an array of custom objects
I've created a custom object that contains id, name and shortname. I would like to get just the id and make ",".join()
it be a string like"1, 2"
So how can I convert an array of type var recentArray = Array<News>()
to a string with only a comma separated ID?
Custom class
class Team: NSObject{
var id: Int!
var name: NSString!
var shortname: NSString!
init(id: Int, name:NSString, shortname: NSString) {
self.id = id
self.name = name
self.shortname = shortname
}
required convenience init(coder aDecoder: NSCoder) {
let id = aDecoder.decodeIntegerForKey("id")
let name = aDecoder.decodeObjectForKey("name") as! String
let shortname = aDecoder.decodeObjectForKey("shortname") as! String
self.init(id: id, name: name, shortname: shortname)
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeInteger(id, forKey: "id")
aCoder.encodeObject(name, forKey: "name")
aCoder.encodeObject(shortname, forKey: "shortname")
}
}
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3 answers
you have a tu function map
.
var t1 = Team(id: 1, name: "Adria", shortname: "Ad")
var t2 = Team(id: 2, name: "Roger", shortname: "Ro")
var t3 = Team(id: 3, name: "Raquel", shortname: "Ra")
var array: [Team] = [t1, t2, t3];
var arrayMap: Array = array.map(){ toString($0.id) }
var joinedString: String = ",".join(arrayMap)
println(joinedString) // 1,2,3
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You can match the array to get just the id from the Team array and reduce the array to a string:
let a = Team(id: 1, name: "Greg", shortname: "G")
let b = Team(id: 2, name: "John", shortname: "J")
let c = Team(id: 3, name: "Jessie", shortname: "Je")
let d = Team(id: 4, name: "Ann", shortname: "A")
let array = [a,b,c,d]
let result = array.map({$0.id}).reduce("", combine: {result, id in return result == "" ? "\(id)" : "\(result),\(id)"})
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