lesson3.5_range

Lesson 3.5: range

Problem statement

Write an app which spits out 100 "hello" messages, using func range.

Problem project

You can use the project in the problem folder of this repo as a starting point.

Note: I have omitted the Carthage folder from the problem project, because it includes large binary files. In order to use the this project, you will need to run carthage update --platform iOS.

Solution

ViewController.swift:

import UIKit
import RxSwift
import RxCocoa

class OneHundredHelloGenerator
{
    class func generate() -> Observable<String>
    {
        let intsObservable = range(0, 100)
        
        let helloObservable = intsObservable.map({ (_) -> String in
            return "hello"
        })
        
        return helloObservable
    }
}

class ViewController: UIViewController {

    let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        OneHundredHelloGenerator.generate().subscribeNext { (s) -> Void in
            debugPrint(s)
        }.addDisposableTo(disposeBag)
    }
}

Discussion:

Here, we use func range to generate 100 "hello" messages

Start up the app and verify that you see 100 "hello" messages in the console:

"hello"
"hello"
"hello"
...

New concepts to explore

• Open up RxExample.xcodeproj.
  • Take a look at func range in Observable+Creation.swift

Solution project

My solution is included in the solution folder of this repo.

Note: I have omitted the Carthage folder from the solution project, because it includes large binary files. In order to run the this project, you will need to run carthage update --platform iOS.