Append an array of strings to a string in Swift

Question

I have an array of strings for one variable, and a string as another variable. I'd like to append all of the strings in the collection to the single string.

So for example I have:

 var s = String()

   //have the CSV writer create all the columns needed as an array of strings
   let arrayOfStrings: [String] = csvReport.map{GenerateRow($0)}

// now that we have all the strings, append each one 
        arrayOfStrings.map(s.stringByAppendingString({$0}))

the line above fails. I've tried every combination I can think of, but at the end of the day, I can't get it unless I just create a for loop to iterate through the entire collection, arrayOfStrings, and add it one by one. I feel like I can achieve this the same way using map or some other function.

Any help?

Thanks!

my answer was deleted with explanation "Code-only answers are considered low-quality and are liable to be deleted". you can use arrayOfStrings.reduce(s, combine: +). — user3441734
– user3441734, Commented Nov 28, 2015 at 21:24

Leo Dabus · Accepted Answer · 2021-12-15 11:53:48Z

19

You can use joined(separator:):

let stringArray = ["Hello", "World"]
let sentence = stringArray.joined(separator: " ")  // "Hello World"

edited Dec 15, 2021 at 11:53

answered Nov 28, 2015 at 18:16

Leo Dabus

237k61 gold badges512 silver badges624 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Community · Accepted Answer · 2017-05-23 10:30:04Z

7

You could convert your array to string using joinWithSeparator(String) here is an example

var array = ["1", "2", "3"]
let stringRepresentation = array.joinWithSeparator("-") // "1-2-3"

source: [ How do I convert a Swift Array to a String? ]

edited May 23, 2017 at 10:30

CommunityBot

11 silver badge

answered Nov 28, 2015 at 18:16

Lucho

1,0441 gold badge17 silver badges26 bronze badges

Comments

Benjamin Mayo · Accepted Answer · 2015-11-28 23:25:28Z

There are at least two options here. The most semantic choice is likely joinWithSeparator on the [String] object. This concatenates every string in the array, placing the separator provided as a parameter between each string.

 let result = ["a", "b", "c", "d"].joinWithSeparator("")

An alternative is to use a functional reduce and the + function operator which concatenates strings. This may be preferred if you want to do additional logic as part of the combine. Both example code produce the same result.

 let result = ["a", "b", "c", "d"].reduce("", combine: +)

It's also worth noting the second options is transferrable to any type that can be added, whereas the first only works with a sequence of strings, as it is defined on a protocol extension of SequenceType where Generator.Element == String.

Collectives™ on Stack Overflow

Append an array of strings to a string in Swift

3 Answers 3

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related