How to group items from array that match, into another array?

Question

For example say I have an array like so:

var someArray = ["1", "1", "2"]

I need to put this into two arrays that look like:

["1","1"]

["2"]

How can I go about this?

Any help would be great!

Answer 1

Use Dictionary initializer init(grouping:by:) Then just get arrays by accessing values property.

Example:

let dic = Dictionary(grouping: someArray) { $0 }
let values = Array(dic.values)
print(values)

Result:

[["2"], ["1", "1"]]