How to check multiple objects in another array in Swift?

Question

I want to check whether one of object is exist in another array.

My object is:

class obj: NSObject {
    var obj_id: Int?
    var status: Int?
}

NOTE : I want to compare by obj_id.

For example, an array of [obj1, obj2 ,obj3], I want to check if obj2 or obj3 are in the array [obj2, obj3, obj4, obj5].

How about Filter method? code let find = otherArray.filter { itemInOtherAray.obj_id == object.obj_id }.first if (find != nil) { //do something } code — Thành Ngô Văn
– Thành Ngô Văn, Commented Aug 7, 2018 at 4:18

matt · Accepted Answer · 2018-08-07 05:00:47Z

1

Use contains(where:).

Unclear what the goal was supposed to be, so here's an example that tests whether any element of the first array is an element of the second array (using the obj_id property):

class Obj: NSObject {
    var obj_id: Int?
    init(obj_id:Int?) {
        self.obj_id = obj_id
    }
}
let arr1 = [Obj(obj_id: 1)],Obj(obj_id: 2),Obj(obj_id: 3)]
let arr2 = [Obj(obj_id: 2),Obj(obj_id: 3),Obj(obj_id: 4),Obj(obj_id: 5)]

var result = false
for ob in arr1 {
    if arr2.contains(where: {$0.obj_id == ob.obj_id}) { // <--
        result = true
        break
    }
}
result // true

answered Aug 7, 2018 at 5:00

matt

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Comments

koropok · Accepted Answer · 2018-08-07 05:19:57Z

0

You can try this way, it will convert the 2 arrays into sets and check for intersection.

class obj: NSObject {

    var obj_id: Int?
    var status: Int?

    override func isEqual(_ object: Any?) -> Bool {
        return self.obj_id == (object as? obj)?.obj_id
    }
}

if !Set(firstArray).intersection(Set(secondArray)).isEmpty {
    // both arrays have something in common
}

answered Aug 7, 2018 at 5:19

koropok

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