Swift return different Types from a function
Completing some old HackerRank challenges.
Some of these appear to be broken - for example "Fair Rations" gives us the following function signature (note: The capital for the parameter is not my fault, it is not changeable within this context.
func fairRations(B: [Int]) -> Int {
// Enter code answer code here
}
Now the problem test cases (the details of the problem are not important here) require that we return an
Int
(i.e. 4) for some test cases, and a
String
(i.e. "NO") for other tests.
So I need to return either a String, or an Int depending upon my answers. I've tried to return an enum, but I can't make any changes to the HackerRank tests - also returning any
like:
func fairRations(B: [Int]) -> Any {
// Enter code answer code here
}
will not work as Any is not implicitly convertible to either a String or an Int.
The HackerRank problem is here: https://www.hackerrank.com/challenges/fair-rations/problem
To clarify in response to Joakim Danielson, the problem description implies that you can output "NO" to the console, but that is not actually true (see screenshot below).
Is it possible to have a function that returns both a String and an Int in Swift?
swift
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
|
show 5 more comments
Completing some old HackerRank challenges.
Some of these appear to be broken - for example "Fair Rations" gives us the following function signature (note: The capital for the parameter is not my fault, it is not changeable within this context.
func fairRations(B: [Int]) -> Int {
// Enter code answer code here
}
Now the problem test cases (the details of the problem are not important here) require that we return an
Int
(i.e. 4) for some test cases, and a
String
(i.e. "NO") for other tests.
So I need to return either a String, or an Int depending upon my answers. I've tried to return an enum, but I can't make any changes to the HackerRank tests - also returning any
like:
func fairRations(B: [Int]) -> Any {
// Enter code answer code here
}
will not work as Any is not implicitly convertible to either a String or an Int.
The HackerRank problem is here: https://www.hackerrank.com/challenges/fair-rations/problem
To clarify in response to Joakim Danielson, the problem description implies that you can output "NO" to the console, but that is not actually true (see screenshot below).
Is it possible to have a function that returns both a String and an Int in Swift?
swift
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
return value will beIntfor Successful test cases andStringfor Failure right?
– hardik parmar
Nov 20 '18 at 6:21
So, what's the exact context here?fairRations(B: [Int])should return anInt,fairRations(B: [String])should return aString, or shouldfairRations(B: [Int])also occasionally return a string?
– Sander Saelmans
Nov 20 '18 at 6:23
@hardikparmar Indeed. The logic defines whether the input is a success or not. I have some code that works, but returns 0 for "Failure" but clearly this will not past any test cases!
– stevenpcurtis
Nov 20 '18 at 6:23
@SanderSaelmans The Signature is func fairRations(B: [Int]) which I would like to try to return EITHER a String or an Int depending upon my internal logic. I cannot change the function that uses this signature
– stevenpcurtis
Nov 20 '18 at 6:25
can you return a tuple like (String, Int)? will that work for your problem statement?
– hardik parmar
Nov 20 '18 at 6:30
|
show 5 more comments
Completing some old HackerRank challenges.
Some of these appear to be broken - for example "Fair Rations" gives us the following function signature (note: The capital for the parameter is not my fault, it is not changeable within this context.
func fairRations(B: [Int]) -> Int {
// Enter code answer code here
}
Now the problem test cases (the details of the problem are not important here) require that we return an
Int
(i.e. 4) for some test cases, and a
String
(i.e. "NO") for other tests.
So I need to return either a String, or an Int depending upon my answers. I've tried to return an enum, but I can't make any changes to the HackerRank tests - also returning any
like:
func fairRations(B: [Int]) -> Any {
// Enter code answer code here
}
will not work as Any is not implicitly convertible to either a String or an Int.
The HackerRank problem is here: https://www.hackerrank.com/challenges/fair-rations/problem
To clarify in response to Joakim Danielson, the problem description implies that you can output "NO" to the console, but that is not actually true (see screenshot below).
Is it possible to have a function that returns both a String and an Int in Swift?
swift
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
Completing some old HackerRank challenges.
Some of these appear to be broken - for example "Fair Rations" gives us the following function signature (note: The capital for the parameter is not my fault, it is not changeable within this context.
func fairRations(B: [Int]) -> Int {
// Enter code answer code here
}
Now the problem test cases (the details of the problem are not important here) require that we return an
Int
(i.e. 4) for some test cases, and a
String
(i.e. "NO") for other tests.
So I need to return either a String, or an Int depending upon my answers. I've tried to return an enum, but I can't make any changes to the HackerRank tests - also returning any
like:
func fairRations(B: [Int]) -> Any {
// Enter code answer code here
}
will not work as Any is not implicitly convertible to either a String or an Int.
The HackerRank problem is here: https://www.hackerrank.com/challenges/fair-rations/problem
To clarify in response to Joakim Danielson, the problem description implies that you can output "NO" to the console, but that is not actually true (see screenshot below).
Is it possible to have a function that returns both a String and an Int in Swift?
swift
swift
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
edited Nov 20 '18 at 6:41
stevenpcurtis
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
asked Nov 20 '18 at 6:18
stevenpcurtisstevenpcurtis
729820
729820
return value will beIntfor Successful test cases andStringfor Failure right?
– hardik parmar
Nov 20 '18 at 6:21
So, what's the exact context here?fairRations(B: [Int])should return anInt,fairRations(B: [String])should return aString, or shouldfairRations(B: [Int])also occasionally return a string?
– Sander Saelmans
Nov 20 '18 at 6:23
@hardikparmar Indeed. The logic defines whether the input is a success or not. I have some code that works, but returns 0 for "Failure" but clearly this will not past any test cases!
– stevenpcurtis
Nov 20 '18 at 6:23
@SanderSaelmans The Signature is func fairRations(B: [Int]) which I would like to try to return EITHER a String or an Int depending upon my internal logic. I cannot change the function that uses this signature
– stevenpcurtis
Nov 20 '18 at 6:25
can you return a tuple like (String, Int)? will that work for your problem statement?
– hardik parmar
Nov 20 '18 at 6:30
|
show 5 more comments
return value will beIntfor Successful test cases andStringfor Failure right?
– hardik parmar
Nov 20 '18 at 6:21
So, what's the exact context here?fairRations(B: [Int])should return anInt,fairRations(B: [String])should return aString, or shouldfairRations(B: [Int])also occasionally return a string?
– Sander Saelmans
Nov 20 '18 at 6:23
@hardikparmar Indeed. The logic defines whether the input is a success or not. I have some code that works, but returns 0 for "Failure" but clearly this will not past any test cases!
– stevenpcurtis
Nov 20 '18 at 6:23
@SanderSaelmans The Signature is func fairRations(B: [Int]) which I would like to try to return EITHER a String or an Int depending upon my internal logic. I cannot change the function that uses this signature
– stevenpcurtis
Nov 20 '18 at 6:25
can you return a tuple like (String, Int)? will that work for your problem statement?
– hardik parmar
Nov 20 '18 at 6:30
return value will be
Int for Successful test cases and String for Failure right?– hardik parmar
Nov 20 '18 at 6:21
return value will be
Int for Successful test cases and String for Failure right?– hardik parmar
Nov 20 '18 at 6:21
So, what's the exact context here?
fairRations(B: [Int]) should return an Int, fairRations(B: [String]) should return a String, or should fairRations(B: [Int]) also occasionally return a string?– Sander Saelmans
Nov 20 '18 at 6:23
So, what's the exact context here?
fairRations(B: [Int]) should return an Int, fairRations(B: [String]) should return a String, or should fairRations(B: [Int]) also occasionally return a string?– Sander Saelmans
Nov 20 '18 at 6:23
@hardikparmar Indeed. The logic defines whether the input is a success or not. I have some code that works, but returns 0 for "Failure" but clearly this will not past any test cases!
– stevenpcurtis
Nov 20 '18 at 6:23
@hardikparmar Indeed. The logic defines whether the input is a success or not. I have some code that works, but returns 0 for "Failure" but clearly this will not past any test cases!
– stevenpcurtis
Nov 20 '18 at 6:23
@SanderSaelmans The Signature is func fairRations(B: [Int]) which I would like to try to return EITHER a String or an Int depending upon my internal logic. I cannot change the function that uses this signature
– stevenpcurtis
Nov 20 '18 at 6:25
@SanderSaelmans The Signature is func fairRations(B: [Int]) which I would like to try to return EITHER a String or an Int depending upon my internal logic. I cannot change the function that uses this signature
– stevenpcurtis
Nov 20 '18 at 6:25
can you return a tuple like (String, Int)? will that work for your problem statement?
– hardik parmar
Nov 20 '18 at 6:30
can you return a tuple like (String, Int)? will that work for your problem statement?
– hardik parmar
Nov 20 '18 at 6:30
|
show 5 more comments
1 Answer
1
active
oldest
votes
Just change the function to return a String. Keep in mind that integers can be represented as a string as well. The string "4" represents the number 4.
I changed the function to this in hacker rank:
func fairRations(B: [Int]) -> String {
return "4"
}
And it passed this test:
Basically,
- If you want to return an integer
x, just returnx.description
- If you want to return NO, just return
"NO".
Both of the above values are strings.
Returning a String here works because the test calls the String(...) initialiser. And if you pass a string to that, it will still create the same string you passed in.
EDIT:
I tried editing the client code and it works. You can just return a Int? and do this:
if let result = fairRations(B: B) {
fileHandle.write(String(result).data(using: .utf8)!)
} else {
fileHandle.write("NO".data(using: .utf8)!)
}
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
add a comment |
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1 Answer
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active
oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Just change the function to return a String. Keep in mind that integers can be represented as a string as well. The string "4" represents the number 4.
I changed the function to this in hacker rank:
func fairRations(B: [Int]) -> String {
return "4"
}
And it passed this test:
Basically,
- If you want to return an integer
x, just returnx.description
- If you want to return NO, just return
"NO".
Both of the above values are strings.
Returning a String here works because the test calls the String(...) initialiser. And if you pass a string to that, it will still create the same string you passed in.
EDIT:
I tried editing the client code and it works. You can just return a Int? and do this:
if let result = fairRations(B: B) {
fileHandle.write(String(result).data(using: .utf8)!)
} else {
fileHandle.write("NO".data(using: .utf8)!)
}
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
add a comment |
Just change the function to return a String. Keep in mind that integers can be represented as a string as well. The string "4" represents the number 4.
I changed the function to this in hacker rank:
func fairRations(B: [Int]) -> String {
return "4"
}
And it passed this test:
Basically,
- If you want to return an integer
x, just returnx.description
- If you want to return NO, just return
"NO".
Both of the above values are strings.
Returning a String here works because the test calls the String(...) initialiser. And if you pass a string to that, it will still create the same string you passed in.
EDIT:
I tried editing the client code and it works. You can just return a Int? and do this:
if let result = fairRations(B: B) {
fileHandle.write(String(result).data(using: .utf8)!)
} else {
fileHandle.write("NO".data(using: .utf8)!)
}
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
add a comment |
Just change the function to return a String. Keep in mind that integers can be represented as a string as well. The string "4" represents the number 4.
I changed the function to this in hacker rank:
func fairRations(B: [Int]) -> String {
return "4"
}
And it passed this test:
Basically,
- If you want to return an integer
x, just returnx.description
- If you want to return NO, just return
"NO".
Both of the above values are strings.
Returning a String here works because the test calls the String(...) initialiser. And if you pass a string to that, it will still create the same string you passed in.
EDIT:
I tried editing the client code and it works. You can just return a Int? and do this:
if let result = fairRations(B: B) {
fileHandle.write(String(result).data(using: .utf8)!)
} else {
fileHandle.write("NO".data(using: .utf8)!)
}
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
Just change the function to return a String. Keep in mind that integers can be represented as a string as well. The string "4" represents the number 4.
I changed the function to this in hacker rank:
func fairRations(B: [Int]) -> String {
return "4"
}
And it passed this test:
Basically,
- If you want to return an integer
x, just returnx.description
- If you want to return NO, just return
"NO".
Both of the above values are strings.
Returning a String here works because the test calls the String(...) initialiser. And if you pass a string to that, it will still create the same string you passed in.
EDIT:
I tried editing the client code and it works. You can just return a Int? and do this:
if let result = fairRations(B: B) {
fileHandle.write(String(result).data(using: .utf8)!)
} else {
fileHandle.write("NO".data(using: .utf8)!)
}
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
edited Nov 20 '18 at 6:51
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
answered Nov 20 '18 at 6:44
SweeperSweeper
67.2k1073139
67.2k1073139
add a comment |
add a comment |
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return value will be
Intfor Successful test cases andStringfor Failure right?– hardik parmar
Nov 20 '18 at 6:21
So, what's the exact context here?
fairRations(B: [Int])should return anInt,fairRations(B: [String])should return aString, or shouldfairRations(B: [Int])also occasionally return a string?– Sander Saelmans
Nov 20 '18 at 6:23
@hardikparmar Indeed. The logic defines whether the input is a success or not. I have some code that works, but returns 0 for "Failure" but clearly this will not past any test cases!
– stevenpcurtis
Nov 20 '18 at 6:23
@SanderSaelmans The Signature is func fairRations(B: [Int]) which I would like to try to return EITHER a String or an Int depending upon my internal logic. I cannot change the function that uses this signature
– stevenpcurtis
Nov 20 '18 at 6:25
can you return a tuple like (String, Int)? will that work for your problem statement?
– hardik parmar
Nov 20 '18 at 6:30