How do I turn an array, for example [Int] into a String keeping commas between elements? If I have an array like [1,2,3,4], I want to receive a String like "1, 2, 3, 4".
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2 Answers
You can do:
let string = array.map { String($0) }
.joined(separator: ", ")
The map call converts the array of numbers to an array of strings, and the joined combines them together into a single string with whatever separator you want between the individual strings.
Or, if this is to be presented in the UI the numbers could require either decimal points and/or thousands separators, then it's better to show the results in a localized format using NumberFormatter:
let array = [1.0, 1.1, 1.2, 1.3]
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.maximumFractionDigits = 2
formatter.minimumFractionDigits = 2
let string = array.compactMap { formatter.string(for: $0) }
.joined(separator: ", ")
Which, for US users, would result in:
1.00, 1.10, 1.20, 1.30
But for German users, it would result in:
1,00, 1,10, 1,20, 1,30
And if you wanted this to be presented nicely as "A, B, and C", in iOS 13+ and/or macOS 10.15+ you can use ListFormatter:
let array = [1.0, 1.1, 1.2, 1.3]
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
formatter.maximumFractionDigits = 2
formatter.minimumFractionDigits = 2
let strings = array.compactMap { formatter.string(for: $0) }
if let result = ListFormatter().string(from: strings) {
print(result)
}
Resulting in:
1.00, 1.10, 1.20, and 1.30
Comments
You just need to map your integers into strings and join them with separator ", "
let array = [1,2,3,4]
let string = array.map(String.init).joined(separator: ", ") // "1, 2, 3, 4"