Encrypt And Decrypt Task of flutter sessions at Roqay

encryptAndDecryptTask.dart

import 'dart:convert';
import 'dart:io';

void main() {
  stdout.write("text: ");
  String text = stdin.readLineSync(encoding: utf8) ?? "";
  stdout.write("how many shifts: ");
  int shiftNumber = int.tryParse(stdin.readLineSync(encoding: utf8) ?? "")!;
  stdout.write("operation is (1 for encrypt, 0 to decrypt): ");
  bool operation = int.tryParse(stdin.readLineSync(encoding: utf8) ?? "")! == 1;
  encryptAndDecrypt(text, shiftNumber, operation);
}

void encryptAndDecrypt(String text, int shiftNumber, bool isEncrypt) {
  /// Session Solution
  if (isEncrypt) {
    print(String.fromCharCodes(text.codeUnits.map((e) => (e + shiftNumber))));
  } else {
    print(String.fromCharCodes(text.codeUnits.map((e) => (e - shiftNumber))));
  }

  /// My Solution
  // var cypheredText = text.split('').map((element) {
  //   int x = element.codeUnitAt(0);
  //   if (isEncrypt) {
  //     return x + shiftNumber;
  //   } else {
  //     return x - shiftNumber;
  //   }
  // }).map((e) => String.fromCharCode(e));
  // print(cypheredText.join());
}