[Solved] How to group Arrays [duplicate]

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You can extend Collection, constrain its Element to Equatable protocol and create a computed property to return the grouped elements using reduce(into:) method. You just need to check if there is a last element on the last collection equal to the current element and append the current element to the last collection if true otherwise append a new collection with it:

extension Collection where Element: Equatable {
    var grouped: [[Element]] {
        return reduce(into: []) {
            $0.last?.last == $1 ?
            $0[$0.index(before: $0.endIndex)].append($1) :
            $0.append([$1])
        }
    }
}

let array = ["1","1","1","2","2","1","1"]
let grouped = array.grouped
print(grouped)  // "[["1", "1", "1"], ["2", "2"], ["1", "1"]]\n"

solved How to group Arrays [duplicate]