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Commit 6b779ef

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Adrián Catalán
committed
Decode morse kata
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‎README.md‎

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| 3 | [Prime Streaming (PG-13)](https://www.codewars.com/kata/5519a584a73e70fa570005f5) | [Pg13PrimeStreaming.java](https://github.com/adrianblade/codewars_java_solution/blob/master/src/main/java/kyu3/prime_streaming_pg_13/Pg13PrimeStreaming.java) |
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| 4 | [Finite state machine](https://www.codewars.com/kata/a-simplistic-tcp-finite-state-machine-fsm/java) | [TCP.java](https://github.com/adrianblade/codewars_java_solution/blob/master/src/main/java/kyu4/finite_state_machine/TCP.java) |
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| 6 | [Buying a car](https://www.codewars.com/kata/554a44516729e4d80b000012) | [BuyingCar.java](https://github.com/adrianblade/codewars_java_solution/blob/master/src/main/java/kyu6/buying_a_car/BuyingCar.java) |
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| 6 | [Decode morse](https://www.codewars.com/kata/54b724efac3d5402db00065e/java) | [MorseCodeDecoder.java](https://github.com/adrianblade/codewars_java_solution/blob/master/src/main/java/kyu6/decode_morse/MorseCodeDecoder.java) |
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| 6 | [Ranking NBA teams](https://www.codewars.com/kata/5a420163b6cfd7cde5000077) | [RankingNbaTeams.java](https://github.com/adrianblade/codewars_java_solution/blob/master/src/main/java/kyu6/nba_teams/RankingNbaTeams.java) |
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| 8 | [Multiply](https://www.codewars.com/kata/50654ddff44f800200000004) | [Multiply.java](https://github.com/adrianblade/codewars_java_solution/blob/master/src/main/java/kyu8/multiply/Multiply.java) |
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package kyu6.decode_morse;
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class MorseCode {
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static String get(String letter) {
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return null;
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}
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}
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package kyu6.decode_morse;
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import java.util.Arrays;
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import java.util.Objects;
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import java.util.stream.Collectors;
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public class MorseCodeDecoder {
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private static final String ONE_SPACE = " ";
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private static final String THREE_SPACES = " {3}";
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public static String decode(String morseCode) {
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StringBuilder result = new StringBuilder();
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// your brilliant code here, remember that you can access the preloaded Morse code table through MorseCode.get(code)
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String[] words = morseCode.split(THREE_SPACES);
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for (String word : words) {
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String[] letters = word.split(ONE_SPACE);
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for (String letter : letters) {
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String translation = MorseCode.get(letter);
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if (translation != null) result.append(translation);
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}
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if (result.length() > 0) {
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result.append(ONE_SPACE);
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}
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}
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return result.toString().trim();
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}
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public static String decode2(String morseCode) {
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return Arrays.stream(morseCode.split(THREE_SPACES))
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.map(i -> Arrays.stream(i.split(ONE_SPACE))
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.map(MorseCode::get)
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.filter(Objects::nonNull)
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.collect(Collectors.joining()))
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.collect(Collectors.joining(" "))
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.trim();
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}
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public static String decode3(String morseCode) {
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return Arrays.stream(morseCode.trim().split(THREE_SPACES))
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.map(MorseCodeDecoder::decodeWord)
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.collect(Collectors.joining(" "));
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}
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private static String decodeWord(String morseWord) {
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return Arrays.stream(morseWord.trim().split(ONE_SPACE))
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.map(MorseCode::get)
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.collect(Collectors.joining());
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}
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}
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# Decode the Morse code
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Your task is to implement a function that would take the morse code as input and return a decoded human-readable string.
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For example:
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MorseCodeDecoder.decode `(".... . -.-- .--- ..- -.. .")`
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//should return `"HEY JUDE"`
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NOTE: For coding purposes you have to use ASCII characters . and -, not Unicode characters.
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The Morse code table is preloaded for you as a dictionary, feel free to use it:
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```
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Coffeescript/C++/Go/JavaScript/Julia/PHP/Python/Ruby/TypeScript: MORSE_CODE['.--']
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C#: MorseCode.Get(".--") (returns string)
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Elixir: @morse_codes variable (from use MorseCode.Constants). Ignore the unused variable warning for morse_codes because it's no longer used and kept only for old solutions.
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Elm: MorseCodes.get : Dict String String
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Haskell: morseCodes ! ".--" (Codes are in a Map String String)
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Java: MorseCode.get(".--")
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Kotlin: MorseCode[".--"] ?: "" or MorseCode.getOrDefault(".--", "")
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Rust: self.morse_code
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Scala: morseCodes(".--")
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C: provides parallel arrays, i.e. morse[2] == "-.-" for ascii[2] == "C"
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All the test strings would contain valid Morse code, so you may skip checking for errors and exceptions. In C#, tests will fail if the solution code throws an exception, please keep that in mind. This is mostly because otherwise the engine would simply ignore the tests, resulting in a "valid" solution.
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```
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Good luck!
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After you complete this kata, you may try yourself at Decode the Morse code, advanced.

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