Array element checking in swift

Question

Currently implementing a favourite function to my application which is based on quotes. I would like to perform a check for if the user has already saved an element to an ar

Answer 1

The better and quick way to find out an element in an array is:

if contains(yourFavArray, stringStatement){
  //Contains you can write your logic
}

Change your favouriteArray as below:

var favouriteQuotesArray: [String] = NSUserDefaults.standardUserDefaults().objectForKey("thekey") as! [String]

Edited:

 if let foundIndex = find(favouriteQuotesArray, dreamFact.dreamArray[factIndex]) {
     sender.setTitle(Constants.like, forState: .Normal)
     favouriteQuotesArray.removeAtIndex(foundIndex)
 }

Answer 2

Do it this way; some cleaner coding techniques to cut through the rubble included.

The declaration of favouriteQuotesArray is a gold star one liner. Got it all?

import UIKit

struct Constants {
    static let defaults = NSUserDefaults.standardUserDefaults()
    static let fqKey = "FavoriteQuotes"
    static let like = "Like"
    static let unlike = "Unlike"
}

class Page2ViewController: UIViewController {
    var dreamArray = [String]() // place holder so class compiles
    var factIndex = 0           // place holder so class compiles

    var favouriteQuotesArray = Constants.defaults.objectForKey(Constants.fqKey) as? [String] ?? [String]() {
        didSet {
            Constants.defaults.setObject(favouriteQuotesArray, forKey: Constants.fqKey)
        }
    }

    @IBOutlet weak var likeButton: UIButton! {
        didSet {
            let favourite = dreamArray[factIndex]
            if let foundIndex = find(favouriteQuotesArray, favourite) {
                likeButton.setTitle(Constants.unlike, forState: .Normal)
            }
            else {
                likeButton.setTitle(Constants.like, forState: .Normal)
            }
        }
    }

    @IBAction func likeButtonClicked(sender: UIButton) {
        let favourite = dreamArray[factIndex]
        if let foundIndex = find(favouriteQuotesArray, favourite) {
            sender.setTitle(Constants.like, forState: .Normal)
            favouriteQuotesArray.removeAtIndex(foundIndex)
        }
        else {
            sender.setTitle(Constants.unlike, forState: .Normal)
            favouriteQuotesArray.append(favourite)
        }
    }
}

Answer 3

Try this:

let currentQuote = dreamFact.dreamArray[factIndex]
if find(favouriteQuotesArray!, currentQuote) != nil {
    //Do something
}