for lops and func not printing the code Missing argument for parameter 'in' in call - swift

Question

I'm trying to print out the names that comes after the search engine clears them so for example I wrote in the searchValue "Mohamed" expecting it to print all Mohameds in the usersSeenStory but it's giving me an error saying Missing argument for parameter 'in' in call
var usersSeenStory = ("ameerahmed_", "_mohamedalaaa", "afapps", "mohamed_khaled"); // Who seen the story are here.
var searchValue = "mohamed"; // This value is for example. It will be inserted in the search input.
func searchForUser(in arr:[String], for str: String) -> [String] {
for results in searchValue {
print(results)
}
}
searchForUser()

Answer 1

It seems you want to get only certain Users. To do this, you need to change your code to this:
var usersSeenStory = ["ameerahmed_", "_mohamedalaaa", "afapps", "mohamed_khaled"]
var searchValue = "mohamed";
func searchForUser(in arr:[String], for str: String) -> [String] {
var matchedUsers = [String]()
for user in arr {
if let _ = user.range(of: str) {
matchedUsers.append(user)
}
}
return matchedUsers
}
searchForUser(in: usersSeenStory, for: searchValue)
But there is also a shorter version to do this:
let filtered = usersSeenStory.filter { $0.range(of: searchValue) != nil}

Answer 2

In order to print all the Mohameds in your usersSeenStory array you just need to add a condition, like that:
var usersSeenStory = ("ameerahmed_", "_mohamedalaaa", "afapps", "mohamed_khaled"); // Who seen the story are here.
var searchValue = "mohamed"; // This value is for example. It will be inserted in the search input.
func searchForUser(in arr:[String], for str: String) {
for results in searchValue {
if results.contains(str) {
print(results)
}
}
}
searchForUser()
or
func searchForUser(in arr:[String], for str: String) -> [String] {
let results = arr.filter{ $0.contains(str) }
print(results)
return results
}