ZcashLightClientKit/ZcashLightClientKit/Extensions/Data+internal.swift

//
//  Data+internal.swift
//  ZcashLightClientKit
//
//  Created by Francisco Gindre on 4/23/20.
//

import Foundation

extension String {
    func toTxIdString() -> String {
        var id = ""
        self.reversed().pairs
            .map {
                $0.reversed()
            }
            .forEach { (reversed) in
                id.append(String(reversed))
            }
        return id
    }
}

extension Collection {
    var pairs: [SubSequence] {
        var startIndex = self.startIndex
        let count = self.count
        let halving = count / 2 + count % 2
        return (0..<halving).map { _ in
            let endIndex = index(startIndex, offsetBy: 2, limitedBy: self.endIndex) ?? self.endIndex
            defer { startIndex = endIndex }
            return self[startIndex..<endIndex]
        }
    }
}