[Solved] Add every 100 string keys from dictionary in array of strings with comma separator

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You just need to group your array elements and use map to join your keys using joined(separator: ", "):

extension Array {
    func group(of n: IndexDistance) -> Array<Array> {
        return stride(from: 0, to: count, by: n)
        .map { Array(self[$0..<Swift.min($0+n, count)]) }
    }
}

Testing:

let dic = ["f":1,"a":1,"b":1,"c":1,"d":1,"e":1, "g": 1]
let arr = Array(dic.keys).group(of: 2).map{
    $0.joined(separator: ", ")
}
arr  //["b, a", "c, f", "e, g", "d"]

5

solved Add every 100 string keys from dictionary in array of strings with comma separator