Transforming a 2D Array

Question

I have an array containing arrays of integers like so:

[[1,2], [1,2,3], [1], [1]]

I want to go over this and transform any arrays with a count > 2 to have only two members. In this example above, the [1,2,3] would become [1,2] or [2,3] or [1,3] I'm not fussed which, just that one of the digits is removed.

I've tried doing a nested for in, however due to it making the array a constant, I can't mutate it inside this loop, and I've briefly looked at the map, filter and reduce on Array, however I can't seem to find a way to utilise them to get this to work. Any ideas would be great!

What if an array have 5 elements would it drop 3 or just 1 element? — Leo Dabus
– Leo Dabus, Commented Sep 4, 2018 at 11:38

G. Veronika · Accepted Answer · 2018-09-04 11:33:15Z

2

You can use suffix(_ maxLength:) or prefix(_ maxLength:). Example below:

let array = [[1,2], [1,2,3], [1], [1]]
let result = array.map { Array($0.suffix(2)) }
print(result)
// it prints: [[1, 2], [2, 3], [1], [1]]

answered Sep 4, 2018 at 11:33

G. Veronika

2302 silver badges11 bronze badges

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

Collectives™ on Stack Overflow

Transforming a 2D Array

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related