SWIFT sorting array of array by date

Question

I'm to trying sort an array of array by date in Swift, but I'm getting this three errors:

Cannot infer contextual base in reference to member 'orderedAscending'
Value of type 'Any' has no member 'compare'
Cast 'Any' to 'AnyObject' or use 'as!' to force downcast to a more specific type to access members

That is the array declaration:

let array = [[5.5, 1, 2020-11-05 23:00:00 +0000], [8.0, 2, 2020-11-10 23:00:00 +0000], [5.5, 1, 2020-10-27 23:00:00 +0000]]

and that is the code that I've written to sort the array:

let sortedArray = array.sorted(by: { (($0[2]).compare($1[2]))! == .orderedAscending })
array = sortedArray

How can I solve? Thanks in advance

Does this answer your question? Sort Objects in Array by date — pkamb
– pkamb, Commented Nov 11, 2020 at 18:02
Using a custom struct rather than a heterogenous array could make your life much easier 😉 And the first code line doesn't compile anyway. — vadian
– vadian, Commented Nov 11, 2020 at 18:06

Joakim Danielson · Accepted Answer · 2020-11-11 18:38:07Z

2

You need to cast the element to sort on to Date. The following cast's the last element of each sub-array to a Date and if the cast fails the sub-array will be sorted last

let sorted = array.sorted(by: { ($0.last as? Date ?? Date.distantFuture) < ($1.last as? Date ?? Date.distantPast)})

answered Nov 11, 2020 at 18:38

Joakim Danielson

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