Change Array of Int to String so it can be put into a label.text

Question

I have an array:

var numberArray = [1,2,3]

I want to convert this into a string and put it into a label text:

label.text = "123"

I've already tried for loops / other things online. Thanks :)

https://stackoverflow.com/q/38165569/2303865 – Leo Dabus May 16 '20 at 15:44 — Leo Dabus, May 16 '20 at 15:44

Jawad Ali · Accepted Answer · 2020-05-16T18:15:03.007

4

You can simply do this using higher order functions Map and Reduce

label.text = numberArray.map{ String($0) }.reduce("", +)

Or you can use joined() as well

label.text = numberArray.map{String($0)}.joined()

You can also use map this way

label.text = numberArray.map(String.init).joined()

edited May 16 '20 at 18:15

answered May 16 '20 at 15:12

Jawad Ali

I did try map before but wasn't using reduce and obviously was doing it wrong. Cheers! – May 16 '20 at 15:15
2

Joined is definitely the better option. It doesn't matter for these small sizes, but reduce has quadratic time complexity, because it makes a new string on every step of the computation. That would be a big deal for larger datasets – Alexander May 16 '20 at 15:31
Yes @Alexander-ReinstateMonica you are perfectly right – Jawad Ali May 16 '20 at 15:41

1 Answers1