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Slight tweaks to Cortis Clark's joinedWithComma function
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| extension Array where Iterator.Element == String { | |
| /// Originally by Cortis Clark on StackOverflow, modified by Ben Leggiero for an example | |
| /// - SeeAlso: https://stackoverflow.com/a/52266604/3939277 | |
| func joinedWithComma(useOxfordComma: Bool = true, maxItemCount: UInt8? = nil) -> String { | |
| let result: String | |
| if let maxItemCount = maxItemCount, count > maxItemCount { | |
| result = self[0 ..< maxItemCount].joined(separator: ", ") + ", etc." | |
| } else if count >= 2 { | |
| let lastIndex = count - 1 | |
| let extraComma = (useOxfordComma && count > 2) ? "," : "" | |
| result = self[0 ..< lastIndex].joined(separator: ", ") + extraComma + " and " + self[lastIndex] | |
| } else if count == 1 { | |
| result = self[0] | |
| } else { | |
| result = "" | |
| } | |
| return result | |
| } | |
| } | |
| // Usage example: | |
| let numbers = [1, 2, 3, 4] | |
| print(numbers.joinedWithComma()) // Default; prints "1, 2, 3, and 4" | |
| print(numbers.joinedWithComma(maxItemCount: 2)) // A maximum of 2 items; prints "1, 2, etc." | |
| print(numbers.joinedWithComma(maxItemCount: 2)) // A maximum of 10 items; prints "1, 2, 3, and 4" | |
| print(numbers.joinedWithComma(maxItemCount: nil)) // No maximum of items; prints "1, 2, 3, 4" | |
| print(numbers.joinedWithComma(maxItemCount: -1)) // Unclear; fails to compile |
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Original answer by Cortis Clark on StackOverflow