🎯 feat: secret handshake

dart/secret-handshake/.exercism/config.json

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+{
+  "authors": [
+    "amscotti"
+  ],
+  "contributors": [
+    "kytrinyx"
+  ],
+  "files": {
+    "solution": [
+      "lib/secret_handshake.dart"
+    ],
+    "test": [
+      "test/secret_handshake_test.dart"
+    ],
+    "example": [
+      ".meta/lib/example.dart"
+    ]
+  },
+  "blurb": "Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.",
+  "source": "Bert, in Mary Poppins",
+  "source_url": "https://www.imdb.com/title/tt0058331/quotes/?item=qt0437047"
+}

dart/secret-handshake/.exercism/metadata.json

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+{"track":"dart","exercise":"secret-handshake","id":"57141d8875f54a0485c53f855253ce6a","url":"https://exercism.org/tracks/dart/exercises/secret-handshake","handle":"LuCCoelho","is_requester":true,"auto_approve":false}

dart/secret-handshake/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests:
+
+```sh
+$ dart test
+```
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit lib/secret_handshake.dart` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Dart track's documentation](https://exercism.org/docs/tracks/dart)
+- The [Dart track's programming category on the forum](https://forum.exercism.org/c/programming/dart)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [Dart API Documentation](https://api.dart.dev/)
+- [Dart Gitter Chat](https://gitter.im/dart-lang/home)
+- [Community Information](https://www.dart.dev/community)
+- [/r/dartlang](https://www.reddit.com/r/dartlang) is the Dart subreddit.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/dart) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

dart/secret-handshake/README.md

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+# Secret Handshake
+
+Welcome to Secret Handshake on Exercism's Dart Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+You are starting a secret coding club with some friends and friends-of-friends.
+Not everyone knows each other, so you and your friends have decided to create a secret handshake that you can use to recognize that someone is a member.
+You don't want anyone who isn't in the know to be able to crack the code.
+
+You've designed the code so that one person says a number between 1 and 31, and the other person turns it into a series of actions.
+
+## Instructions
+
+Your task is to convert a number between 1 and 31 to a sequence of actions in the secret handshake.
+
+The sequence of actions is chosen by looking at the rightmost five digits of the number once it's been converted to binary.
+Start at the right-most digit and move left.
+
+The actions for each number place are:
+
+```plaintext
+00001 = wink
+00010 = double blink
+00100 = close your eyes
+01000 = jump
+10000 = Reverse the order of the operations in the secret handshake.
+```
+
+Let's use the number `9` as an example:
+
+- 9 in binary is `1001`.
+- The digit that is farthest to the right is 1, so the first action is `wink`.
+- Going left, the next digit is 0, so there is no double-blink.
+- Going left again, the next digit is 0, so you leave your eyes open.
+- Going left again, the next digit is 1, so you jump.
+
+That was the last digit, so the final code is:
+
+```plaintext
+wink, jump
+```
+
+Given the number 26, which is `11010` in binary, we get the following actions:
+
+- double blink
+- jump
+- reverse actions
+
+The secret handshake for 26 is therefore:
+
+```plaintext
+jump, double blink
+```
+
+~~~~exercism/note
+If you aren't sure what binary is or how it works, check out [this binary tutorial][intro-to-binary].
+
+[intro-to-binary]: https://medium.com/basecs/bits-bytes-building-with-binary-13cb4289aafa
+~~~~
+
+## Source
+
+### Created by
+
+- @amscotti
+
+### Contributed to by
+
+- @kytrinyx
+
+### Based on
+
+Bert, in Mary Poppins - https://www.imdb.com/title/tt0058331/quotes/?item=qt0437047

dart/secret-handshake/analysis_options.yaml

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+analyzer:
+  errors:
+    unused_element:        error
+    unused_import:         error
+    unused_local_variable: error
+    dead_code:             error
+
+linter:
+  rules:
+    # Error Rules
+    - avoid_relative_lib_imports
+    - avoid_types_as_parameter_names
+    - literal_only_boolean_expressions
+    - no_adjacent_strings_in_list
+    - valid_regexps

dart/secret-handshake/lib/secret_handshake.dart

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+class SecretHandshake {
+  List<String> commands(int number) {
+    List<String> commands = [];
+    String numberBinary = number.toRadixString(2);
+
+    while (numberBinary.length < 5) {
+      numberBinary = '0' + numberBinary;
+    }
+
+    if (numberBinary[4] == '1') {
+      commands.add('wink');
+    }
+
+    if (numberBinary[3] == '1') {
+      commands.add('double blink');
+    }
+
+    if (numberBinary[2] == '1') {
+      commands.add('close your eyes');
+    }
+
+    if (numberBinary[1] == '1') {
+      commands.add('jump');
+    }
+
+    if (numberBinary[0] == '1') {
+      List<String> commandsReverse = [];
+      for (int i = commands.length - 1; i > -1; i--) {
+        commandsReverse.add(commands[i]);
+      }
+      return commandsReverse;
+    }
+
+    return commands;
+  }
+}

dart/secret-handshake/pubspec.yaml

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+name: 'secret_handshake'
+environment:
+  sdk: '>=2.18.0 <3.0.0'
+dev_dependencies:
+  test: '<2.0.0'

dart/secret-handshake/test/secret_handshake_test.dart

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+import 'package:secret_handshake/secret_handshake.dart';
+import 'package:test/test.dart';
+
+void main() {
+  final secretHandshake = SecretHandshake();
+
+  group('SecretHandshake', () {
+    test('wink for 1', () {
+      final result = secretHandshake.commands(1);
+      expect(result, equals(<String>['wink']));
+    }, skip: false);
+
+    test('double blink for 10', () {
+      final result = secretHandshake.commands(2);
+      expect(result, equals(<String>['double blink']));
+    }, skip: false);
+
+    test('close your eyes for 100', () {
+      final result = secretHandshake.commands(4);
+      expect(result, equals(<String>['close your eyes']));
+    }, skip: false);
+
+    test('jump for 1000', () {
+      final result = secretHandshake.commands(8);
+      expect(result, equals(<String>['jump']));
+    }, skip: false);
+
+    test('combine two actions', () {
+      final result = secretHandshake.commands(3);
+      expect(result, equals(<String>['wink', 'double blink']));
+    }, skip: false);
+
+    test('reverse two actions', () {
+      final result = secretHandshake.commands(19);
+      expect(result, equals(<String>['double blink', 'wink']));
+    }, skip: false);
+
+    test('reversing one action gives the same action', () {
+      final result = secretHandshake.commands(24);
+      expect(result, equals(<String>['jump']));
+    }, skip: false);
+
+    test('reversing no actions still gives no actions', () {
+      final result = secretHandshake.commands(16);
+      expect(result, equals(<String>[]));
+    }, skip: false);
+
+    test('all possible actions', () {
+      final result = secretHandshake.commands(15);
+      expect(result, equals(<String>['wink', 'double blink', 'close your eyes', 'jump']));
+    }, skip: false);
+
+    test('reverse all possible actions', () {
+      final result = secretHandshake.commands(31);
+      expect(result, equals(<String>['jump', 'close your eyes', 'double blink', 'wink']));
+    }, skip: false);
+
+    test('do nothing for zero', () {
+      final result = secretHandshake.commands(0);
+      expect(result, equals(<String>[]));
+    }, skip: false);
+  });
+}