struct AccountBalance: Decodable {
    let balance: Double
    let currency: String

    init(balance: Double, currency: String ) {
        self.currency = currency
        self.balance = balance
    }

    enum CodingKeys: String, CodingKey {
        case currency = "Currency"
        case balance = "Balance"
    }

let result = zip(accountBalance, getsSaved).enumerate().filter() {
                $1.0 == $1.1
                }.map{$0.0}

Closure tuple parameter '(offset: Int, element: (AccountBalance, AccountBalance))' does not support destructuring with implicit parameters