Splitting String after Comma into Tuples Swift - swift

Question

let input = "hello, world song"
I have an input string as above.
So i can easily use this partial string something like this
output.0 // hello
output.1 // world song
I tried something like this How to split a string by new lines in Swift but i could not exactly what i want.
Can someone write an extension for this please in a nice way?

Answer 1

I would do something like this:
extension String {
func splitAtFirst(_ separator: Character) -> (head: Substring, tail: Substring?) {
guard let indexOfSeparator = self.firstIndex(of: separator) else {
return (head: Substring(self), tail: nil)
}
let indexAfterSeparator = self.index(indexOfSeparator, offsetBy: +1, limitedBy: self.endIndex)!
return (
head: self[..<indexOfSeparator],
tail: self[indexAfterSeparator...]
)
}
}
let (head, tail) = "abc, def, ghi".splitAtFirst(",")
print(head) // abc
print(tail as Any) // Optional(" def, ghi")
This returns Substrings, which gives you an efficient way to do a lot of processing on an input string without causing a bunch of copies along the way. Of course, you should promote these substrings to full on strings after you've finished processing them.

Answer 2

You can use an extension as below:
extension StringProtocol {
var tupleOfSplittedString: (String,String) {
if !self.isEmpty {
let splitted = self.split(separator: ",").map { String($0)}
let firstPart = splitted[0]
let otherPart = String(splitted[1...].joined().dropFirst())
return (firstPart,otherPart)
}
return ("","")
}
}
let input = "hello, world song"
let resultOfFirstPart = input.tupleOfSplittedString.0 // hello
let resultOfOtherPart = input.tupleOfSplittedString.1 // world song

Answer 3

This code uses the .components method to split a string by a substring. I have tested this, and it was successful, even if the String is blank (it returns ("", "") in that case)
Line 4 of this code is a bit hard to read, but you can split it up into multiple lines of code if you would like.
import Foundation
extension String {
var tuple: (String, String) {
return self.components(separatedBy: ",").count == 2 ? ((self.components(separatedBy: ",")[0], self.components(separatedBy: ",")[1] )) : ("", "")
}
}
var input = "hello, world song"
print(input.tuple.0) //prints hello
print(input.tuple.1) //prints world song