While the response from Max is great, it does not let you find multiple indexes of multiple objects, ie. indexes of the subset of the array. If you need that functionality, extensions are, as always, your best friend
func indexesOfSubset(objects : [T]) -> [Int] {
// Create storage for filtered objectsand results
var unusedObjects = objects
var result : [Int] = []
// Enumerate through all objects in array
for (index, obj) in enumerate(self) {
// Enumerate again through all objects that has not been found
for x in unusedObjects {
// If we hit match, append result, remove it from usused objects
if obj as! T == x {
result.append(index)
unusedObjects = unusedObjects.filter( { $0 != x } )
break
}
}
}
// Get results
return result
}
Note* : Works on Swift 1.2, if you want compatibility with 1.1, replace as! -> as
