Sha256: 142af16ad82a7fdd2ab83f68705ad35ca2d5449aebb66b2934115f6dda905521
Contents?: true
Size: 1.85 KB
Versions: 184
Compression:
Stored size: 1.85 KB
Contents
# Prime Factors Compute the prime factors of a given natural number. A prime number is only evenly divisible by itself and 1. Note that 1 is not a prime number. ## Example What are the prime factors of 60? - Our first divisor is 2. 2 goes into 60, leaving 30. - 2 goes into 30, leaving 15. - 2 doesn't go cleanly into 15. So let's move on to our next divisor, 3. - 3 goes cleanly into 15, leaving 5. - 3 does not go cleanly into 5. The next possible factor is 4. - 4 does not go cleanly into 5. The next possible factor is 5. - 5 does go cleanly into 5. - We're left only with 1, so now, we're done. Our successful divisors in that computation represent the list of prime factors of 60: 2, 2, 3, and 5. You can check this yourself: - 2 * 2 * 3 * 5 - = 4 * 15 - = 60 - Success! ## Installation See [this guide](https://github.com/exercism/xr/blob/master/docs/INSTALLATION.md) for instructions on how to setup your local R environment. ## How to implement your solution In each problem folder, there is a file named `<exercise_name>.R` containing a function that returns a `NULL` value. Place your implementation inside the body of the function. ## How to run tests Inside of RStudio, simply execute the `test_<exercise_name>.R` script. This can be conveniently done with [testthat's `auto_test` function](https://www.rdocumentation.org/packages/testthat/topics/auto_test). Because exercism code and tests are in the same folder, use this same path for both `code_path` and `test_path` parameters. On the command-line, you can also run `Rscript test_<exercise_name>.R`. ## Source The Prime Factors Kata by Uncle Bob [http://butunclebob.com/ArticleS.UncleBob.ThePrimeFactorsKata](http://butunclebob.com/ArticleS.UncleBob.ThePrimeFactorsKata) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.
Version data entries
184 entries across 184 versions & 1 rubygems