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2.4 KiB

id, title, challengeType, dashedName
id title challengeType dashedName
6a22d77ddf034bc4e35b1d5c Challenge 355: Morse Code 28 challenge-355

--description--

Given a Morse code string, return the decoded message using the following table:

Code Letter Code Letter
.- A -. N
-... B --- O
-.-. C .--. P
-.. D --.- Q
. E .-. R
..-. F ... S
--. G - T
.... H ..- U
.. I ...- V
.--- J .-- W
-.- K -..- X
.-.. L -.-- Y
-- M --.. Z
  • Letters are separated by a single space
  • Words are separated by three spaces

--hints--

decodeMorse("--..") should return "Z".

assert.equal(decodeMorse("--.."), "Z");

decodeMorse("... --- ...") should return "SOS".

assert.equal(decodeMorse("... --- ..."), "SOS");

decodeMorse("..-. .-. . . -.-. --- -.. . -.-. .- -- .--.") should return "FREECODECAMP".

assert.equal(decodeMorse("..-. .-. . . -.-. --- -.. . -.-. .- -- .--."), "FREECODECAMP");

decodeMorse(".... . .-.. .-.. --- .-- --- .-. .-.. -..") should return "HELLO WORLD".

assert.equal(decodeMorse(".... . .-.. .-.. ---   .-- --- .-. .-.. -.."), "HELLO WORLD");

decodeMorse("- .... . --.- ..- .. -.-. -.- -... .-. --- .-- -. ..-. --- -..- .--- ..- -- .--. . -.. --- ...- . .-. - .... . .-.. .- --.. -.-- -.. --- --.") should return "THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG".

assert.equal(decodeMorse("- .... .   --.- ..- .. -.-. -.-   -... .-. --- .-- -.   ..-. --- -..-   .--- ..- -- .--. . -..   --- ...- . .-.   - .... .   .-.. .- --.. -.--   -.. --- --."), "THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG");

--seed--

--seed-contents--

function decodeMorse(code) {

  return code;
}

--solutions--

function decodeMorse(code) {
  const table = {
    '.-': 'A', '-...': 'B', '-.-.': 'C', '-..': 'D', '.': 'E',
    '..-.': 'F', '--.': 'G', '....': 'H', '..': 'I', '.---': 'J',
    '-.-': 'K', '.-..': 'L', '--': 'M', '-.': 'N', '---': 'O',
    '.--.': 'P', '--.-': 'Q', '.-.': 'R', '...': 'S', '-': 'T',
    '..-': 'U', '...-': 'V', '.--': 'W', '-..-': 'X', '-.--': 'Y',
    '--..': 'Z'
  };

  return code.split('   ')
    .map(word => word.split(' ').map(c => table[c]).join(''))
    .join(' ');
}