Swift Question
Swift 3/4 Array containsObject() extension
I'm currently using this extension for Swift 3/4:
extension Array
{
func containsObject(_ object:Any) -> Bool
{
if let anObject:AnyObject = object as? AnyObject
{
for obj in self
{
if let anObj:AnyObject = obj as? AnyObject
{
if anObj === anObject
{
return true
}
}
}
}
return false
}
}
I know this is sub-optimal. And it also generates some unnecessary compile-time warnings:
Conditional cast from 'Any' to 'AnyObject' always succeeds.
Conditional cast from 'Element' to 'AnyObject' always succeeds.
Can somebody suggest a better extension for checking containment of any kind of object?
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Answer Source
That means there is no need to use conditional cast. Remove the if let and change as? to as
extension Array {
func containsObject(_ object: Any) -> Bool {
for obj in self {
if obj as AnyObject === object as AnyObject {
return true
}
}
return false
}
}
Or simply:
extension Array {
func containsObject(_ object: Any) -> Bool {
return contains(where: {$0 as AnyObject === object as AnyObject})
}
}
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