focuspirit

enum CurlyBracketsType: String {
    case forwards = "{"
    case backwards = "}"
    
    private var opposite: String {
        switch self {
        case .forwards:
            return CurlyBracketsType.backwards.rawValue

focuspirit

package com.fotoespiritu.twcurrency;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.util.ArrayList;

import org.apache.http.HttpEntity;

focuspirit

import Foundation

class CalculatorBrain
{
    
    private enum Op: Printable
    {
        case Operand(Double)
        case UnaryOperation(String, Double -> Double)
        case BinaryOperation(String, (Double, Double) -> Double)