devios devios - 4 months ago 278
Swift Question

Swift equivalent of Array.componentsJoinedByString?

In Objective-C we can call

componentsJoinedByString
to produce a string with each element of the array separated by the supplied string. While Swift has a
componentsSeparatedByString
method on String, there doesn't appear to be the inverse of this on Array:

'Array<String>' does not have a member named 'componentsJoinedByString'


What is the inverse of
componentsSeparatedByString
in Swift?

Answer

Swift 3.0:

Similar to Swift 2.0, but API renaming has simplified joinWithSeparator to joined.

let joinedString = ["1", "2", "3", "4", "5"].joined(separator:", ")

Swift 2.0:

You can use the joinWithSeparator method on SequenceType to join an array of strings with a string separator.

let joinedString = ["1", "2", "3", "4", "5"].joinWithSeparator(", ")

// joinedString: String = "1, 2, 3, 4, 5" 

See SequenceType: joinWithSeparator(_:) for more information.

Swift 1.0:

You can use the join standard library function on String to join an array of strings with a string.

let joinedString = ", ".join(["1", "2", "3", "4", "5"])

// joinedString: String = "1, 2, 3, 4, 5" 

Or if you'd rather, you can use the global standard library function:

let joinedString = join(", ", ["1", "2", "3", "4", "5"])

// joinedString: String = "1, 2, 3, 4, 5"
Comments