Swift using maps and CustomStringConvertible

swfit_stuff.swift

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

import UIKit

var str = "Hello, playground"
let a = ["a", "b", "c"]
let b = ["d", "e", "f"]
let c = ["g", "h", "i"]
let aa = [a, b, c]

let m = aa.map { (a) -> [String] in
    a.map({ (s) -> String in
        s + " xxx"
    })
}

print(m)
print(aa)

let r = ["a", "b", "c"].reduce("", { $0 + $1 } )
print(r)

class thing: CustomStringConvertible {
    var name: String?
    var isGood: Bool?
    
    init(name: String, good: Bool) {
        self.name = name
        isGood = good
    }
    
    var description: String {
        return "Name: \(name ?? ""), Good: \(isGood ?? false)"
    }
}

let things = [thing(name: "one", good: true), thing(name: "two", good: false), thing(name: "three", good: true)]

print(things)