I just published the R translation of this Kata.
Please, check it out and comment or approve it.

It is my first Kata translation, so I am open to any constructive criticism.

In R, only a few libraries can be loaded in the soluntions, and non of them contains a function to test prime numbers or factorize numbers. So, I wrote my own code. It works but it runs out of time.

Any suggestions or tips to beat the clock?

Let me rephrase. I know it's solvable. Do you have any suggestions to optimize O(n) code in R? I am unsure which operations are more time consuming or if I should use a particular package

I run out of time with this kata in R. I am pretty sure my code is O(n), but I got stuck at approx. 54 test cases. Suggestions accepted!

Got it! Thanks mate

Can you please elaborate further? I do not define any dictionary in my solution, which contains only a list within the function scope and returns a string. I think the definition of the problem does not request any dictionary

I think there is an issue with tests in Python. My code passes all tests, but I get a STDERR message:

Time: 508ms Passed: 10 Failed: 0 Exit Code: 1

Test Results:
Example from description [...]
Basic Morse decoding [...]
Extra zeros handling [...]

STDERR
Traceback (most recent call last):
File "/workspace/default/tests.py", line 30, in
testAndPrint(decodeMorse(' . . '), 'E E')
File "/workspace/default/solution.py", line 11, in decode_morse
msg += MORSE_CODE[char]
KeyError: ''