t.swift

//: Playground - noun: a place where people can play

import UIKit

struct Obj {
    let id: String
    init(id: String) {
        self.id = id
    }
}

extension Obj: Equatable {}
func ==(lhs: Obj, rhs: Obj) -> Bool {
    return lhs.id == rhs.id
}

let one = Obj(id: "beep")
let two = Obj(id: "beep")
let three = Obj(id: "boop")

var arr = [one, two, three]
var uniq = [Obj]()

for item in arr {
    guard uniq.indexOf(item) == nil else {
        continue
    }
    uniq.append(item)
}

print(uniq)