Random Morse Code Digit Generator

Choose one decimal digit with its International Morse code sequence using injected randomness.

Description

Choose one of 10 stored digits prompts containing a symbol and its International Morse sequence.

International Morse code assigns a five-element dot-and-dash sequence to each decimal digit. A digit-plus-signal prompt supports visual recognition practice without generating an audio transmission.^[1]

The output value contains the original mark or digit, a colon separator, and a signal written with middle dot · and minus sign −. The fixed repertoire covers the decimal digits zero through nine. These Unicode glyphs differ from ASCII period and hyphen.

When to use Random Morse Code Digit Generator

Use it for digits Morse flashcards or text-only signal recognition fixtures.

How to use Random Morse Code Digit Generator and understand its results

Run without input fields, or send {} to the API.
Read the leading symbol and the signal after its separator. Preserve the distinction between the symbol being encoded and the dots/dashes of its code.
Run again for another prompt. Add audio, speed, and timing separately if the exercise requires listening practice.

index = floor(randomDraw × 10); value = storedPrompts[index]

One draw chooses a complete stored prompt. Signal length does not change its selection weight.

The implementation returns the stored combined string unchanged, without translating an entered message or applying signal spacing. For the colon punctuation prompt, the output begins with two colons: the mark and its separator.

json

{
  "input": {},
  "randomDraw": 0.25,
  "output": {
    "value": "2:··−−−"
  }
}

Draw zero selects the first stored prompt, and a draw just below one selects the last. Invalid random draws cause an error. A result can repeat; there is no deck state or without-replacement mode.

Limitations and assumptions

The default source is Math.random; no seed input or cryptographic entropy guarantee is provided. Repeated runs may select the same result, and the distribution depends on the random source.

The output is not an audio waveform, timing instruction, complete message, or an exhaustive list of Morse prosigns. It does not assess a learner’s response.

Alternative or Complementary methods

Use the letter or punctuation generator for a different prompt repertoire. A message converter can encode supported plain letters and digits; normalize the signal glyphs to its expected ASCII dot/dash form before decoding a separated digit signal.

References

ITU-R M.1677-1: International Morse Code (2009) — International Telecommunication Union

Similar or alternative tools

Related Morse Prompt Generator
Choose a different stored symbol-and-signal prompt repertoire.
Morse Code Character Generator
Generate a letter paired with its Morse signal.