How to check if array is null or empty?

Question

I want to check if my array is empty or null, and on base of which I want to create a condition for example.

if(array ==  EMPTY){
//do something
}

Answer 1

Swift 3

As in latest version of swift 3 the ability to compare optionals with > and < is not avaliable

It is still possible to compare optionals with ==, so the best way to check if an optional array contains values is:

if array?.isEmpty == false {
    print("There are objects!")
}

as per array count

if array?.count ?? 0 > 0 {
    print("There are objects!")
}

There are other ways also and can be checked here link to the answer

Answer 2

As nil maps to 0, which equals NO, the most elegant way should be

if (![array count])

the '==' operator is not necessary.

Answer 3

Just to be really verbose :)

if (array == nil || array.count == 0)

Answer 4

Best performance.

if (array.firstObject == nil)
{
    // The array is empty
}

The way to go with big arrays.

Answer 5

if (array == (id)[NSNull null] || [array count] == 0) {
    NSLog(@"array is empty");
}

Answer 6

if (!array || !array.count){
  ...
}

That checks if array is not nil, and if not - check if it is not empty.