Teeing up two dictionaries of tabs.

tab_groups.swift

import Foundation

struct Tab {
    let id = UUID()
    let url: URL
}

let twitter = Tab(url: URL(string: "https://twitter.com/")!)
let pointFree = Tab(url: URL(string: "https://www.pointfree.co/")!)
let feedbin = Tab(url: URL(string: "https://feedbin.com/")!)
let gitHub = Tab(url: URL(string: "https://github.com/")!)

let tabGroup1 = Dictionary(uniqueKeysWithValues: [twitter, pointFree].map { ($0.id, $0) })
let tabGroup2 = Dictionary(uniqueKeysWithValues: [feedbin, gitHub].map { ($0.id, $0) })