How to search specific element from generic array e.g [AnyObject] in swift?

Question

I need to search whether GENERIC array contains specific element or not in swift.

    var arrProducts = [AnyObject]()

    arrProducts.append(Article())
    arrProducts.append(Flower())
    arrProducts.append(Chocolate())

Here products can be any custom object which I am adding in this array.

Now I want to check if arrProducts contain any of 3 custom class objects

Is this what you are looking for: stackoverflow.com/questions/29679486/… ? Or this stackoverflow.com/a/34504697/1187415 ? — Martin R
– Martin R, Commented Jul 7, 2016 at 6:47
if arrProducts.contains({$0 === myArticle}) as in stackoverflow.com/a/34504697/1187415 ? — Martin R
– Martin R, Commented Jul 7, 2016 at 7:27

OOPer · Accepted Answer · 2016-07-07 12:54:54Z

0

This will check "if arrProducts contain any of 3 custom class objects".

let isContainingAnyOf3CustomClassObject =
    arrProducts.contains {$0 is Article || $0 is Flower || $0 is Chocolate}
//->true

If you need to retrieve all elements of any 3 types, you can use filter.

let elementsOfAny3Types = arrProducts.filter {$0 is Article || $0 is Flower || $0 is Chocolate}

If you want the first element, you can use first.

let firstElementOfAny3Types = arrProducts.filter {$0 is Article || $0 is Flower || $0 is Chocolate}.first

But this may be more efficient:

if let firstMatchingIndex = arrProducts.indexOf({$0 is Article || $0 is Flower || $0 is Chocolate}) {
    let firstMatchingElement = arrProducts[firstMatchingIndex]
    print(firstMatchingElement)
}

If any above are not what you mean, you need to modify your question and describe what you really want to achieve more precisely.

edited Jul 7, 2016 at 12:54

answered Jul 7, 2016 at 10:50

OOPer

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2 Comments

Dhaval H. Nena Over a year ago

Need to search specific element from array which could be of any 3 types!

OOPer Over a year ago

Checking contains or not and searching the exact element are different things and you'd better clarify such sort of things in your question. I'll update my answer later.

Luca Angeletti · Accepted Answer · 2016-07-07 16:03:03Z

0

One more method to search for objects of a specific class is flatMap. The benefit of this apporach is that you get an array with the right type.

You have this

class Article { }
class Flower { }
class Chocolate { }

let products : [AnyObject] = [Article(), Flower(), Chocolate()]

Let's extract the flowers

let flowers = products.flatMap { $0 as? Flower }

The flowers array has the following type [Flower] and contains only the right objects.

edited Jul 7, 2016 at 16:03

answered Jul 7, 2016 at 15:55

Luca Angeletti

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