How to get proper string array in swift?

Question

["[\"1\", \"7\", \"13\", \"19\", \"25\"]", "[\"6\", \"12\", \"13\"]"]

I am getting this as output how to get string array like this in Swift

["1", "7", "13", "19", "25", "6", "12", "13"]

I tried all to convert this array in proper array but no luck. Is there a solution for this ?

Thank You!!

@Pratik Sanap you need to remove or replace occurrence of "\" before appending to array. — Tushar Sharma
– Tushar Sharma, Commented Jun 23, 2017 at 19:15
Edit your question to include the code you used to create the array. — rob mayoff
– rob mayoff, Commented Jun 23, 2017 at 19:16
there was optional string present in array I removed that. and also I tried to replace "\" with " " but no luck — Pratik Sanap
– Pratik Sanap, Commented Jun 23, 2017 at 19:17

vadian · Accepted Answer · 2017-06-23 19:24:40Z

1

Simple solution (without significant error handling), the strings can be treated as JSON

let array = ["[\"1\", \"7\", \"13\", \"19\", \"25\"]", "[\"6\", \"12\", \"13\"]"]

var result = [String]()
for item in array {
    let jsonArray = try! JSONSerialization.jsonObject(with: item.data(using: .utf8)!) as! [String]
    result.append(contentsOf: jsonArray)
}
print(result)

answered Jun 23, 2017 at 19:24

vadian

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1 Comment

Rob Over a year ago

Or let result = array.flatMap { try! JSONSerialization.jsonObject(with: $0.data(using: .utf8)!) as! [String] }

Rob · Accepted Answer · 2017-06-23 19:30:51Z

First, assuming you had a simple array of arrays, you can flatten it with flatMap:

let input = [["1", "7", "13", "19", "25"], ["6", "12", "13"]]
let output = input.flatMap { $0 }

That outputs

["1", "7", "13", "19", "25", "6", "12", "13"]

Or, even easier, just append the second array to the first one, bypassing the array of arrays altogether:

let array1 = ["1", "7", "13", "19", "25"]
let array2 = ["6", "12", "13"]
let output = array1 + array2

But your example looks like it's not an array of arrays, but rather array of descriptions of arrays, e.g. something like:

let array1 = ["1", "7", "13", "19", "25"]
let array2 = ["6", "12", "13"]
let input = ["\(array1)", "\(array2)"]

let output = ...                       // this is so complicated, I wouldn't bother trying it

Rather than figuring out how to reverse this array of interpolated strings, I'd suggest you revisit how you built that, bypassing interpolated strings (or description of the arrays).

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