Leveraging JavaScript for morsecode encryption

I'm in the process of creating a program to convert any text string to Morse Code in a straightforward manner. As a beginner in programming, I'd appreciate any advice on methods I could utilize.

At the moment, I've defined a phrase (string) and an array containing the Morse Code equivalents, but I'm struggling with the next steps of extracting each character from the string, comparing it with the array, and outputting the Morse Code representation of the string.

var sentence = "sink or swim";

var morse = [".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.."];

for(i=0; i<sentence.length; i++){

char = sentence.charAt(i);

WScript.echo(char + " | " + i);
}
javascript

Answer №1

If you're looking for a way to encode text into Morse code, you can create a dictionary like the one below:

var morseCodeAlphabet = {
    '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': '--..',  ' ': '/',
    '1': '.----', '2': '..---', '3': '...--', '4': '....-', 
    '5': '.....', '6': '-....', '7': '--...', '8': '---..', 
    '9': '----.', '0': '-----', 
}

"This is a sentence containing numbers: 1 2 3 4 5"
    .split('')            // Convert the string into an array
    .map(function(char){  // Replace each character with its Morse code equivalent
        return morseCodeAlphabet[char.toLowerCase()] || ''; // Use lowercase and ignore unknown characters
    })
    .join(' ')            // Convert the array back to a string
    .replace(/ +/g, ' '); // Remove any double spaces that may have occurred

// Morse code output: "- .... .. ... / .. ... / .- / ... . -. - . -. -.-. . / -.-. --- -. - .- .. -. .. -. --. / -. ..- -- -... . .-. ... / .---- / ..--- / ...-- / ....- / ....."

Answer №2

To begin with, the first step is to remove any characters that cannot be encoded:

phrase = phrase.toLowerCase().replace(/[^a-z]/g, "");

By utilizing the replace function along with a regular expression, the outcome will be a string containing only alphabetic characters. Additionally, all letters are converted to lowercase for simplicity.

Subsequently, within the for loop:

c = phrase.charCodeAt(i);

This action transforms the letter into its corresponding ASCII code value. The resulting morse code would then be morseCode[c - 97].

While Gerald Schneider proposes enhancing this encoding technique by incorporating numbers, it would introduce a level of complexity to the code.

Answer №3

To achieve a one to one mapping, consider converting the array to an object. This approach ensures that unwanted characters do not interfere with the output as the decode function will filter them out if they are not found as a key.

var morseObj = {};
for (var i = 97, l = 97 + morseCode.length; i < l; i++) {
  morseObj[String.fromCharCode(i)] = morseCode[i - 97];
}

Subsequently, create a decode function as follows:

function encode(sentence) {
  var output = '';
  for (var i = 0, l = sentence.length; i < l; i++) {
    var letter = sentence[i].toLowerCase();
    if (morseObj[letter]) { output += morseObj[letter] + ' '; }
  }
  return output;
}

encode('My name is Andy'); // "-- -.-- -. .- -- . .. ... .- -. -.. -.-- "

Check out the DEMO

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