Deduplicate - sum of digits

[hobovsky]

Originally reported on #39

1. Sum of Digits / Digital Root

• 6kyu
• Calculate digital root
• 90% with ~190k completions
• 2 pending issues
• 29 languages + 2 pending translations
• Published Sep 2014, author inactive

2. Life Path Number

• 7kyu
• Calculate digital root. Input is a formatted string.
• 92% with 3k completions
• 1 pending issue
• 5 languages + 1 pending translation (all languages covered by 1.)
• Published Nov 2016, author last active Jul 2022

3. Digit Sum

• 7kyu
• Calculate digital root. Input is a string so it's required to handle a potential overflow or values out of bounds of basic numeric types.
• 90% with ~700 completions
• No pending issues
• 2 languages + 1 pending translation
• Published Feb 2016, author last active Jul 2022

4. Sum of digits

• 7kyu
• Just a sum of digits. Valid inputs of many types, input validation.
• 86% with ~1.6k completions
• No pending issues
• 2 languages
• Published Sep 2017, author inactive

5. Summing a number's digits

• 7kyu
• Sum of digits, input can be negative
• 92% with 25k completions
• No pending issues
• 11 languages + 3 pending translations
• Published Feb 2014, author inactive

6. Debug Sum of Digits of a Number

• 7kyu
• bug fixing. Return sum of digits.
• 91% with ~4.5k solutions
• No pending issues
• 2 languages + 3 pending translations
• Published Nov 2015, author inactive

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Conclusion

• Keep 1. Sum of Digits / Digital Root
• Retire 2. Life Path Number
• Retire 3. Digit Sum
• Keep 5. Summing a number's digits
• Retire 4. Sum of digits
• Retire 6. Debug Sum of Digits of a Number after translations are moved

Filling gaps

• Move D pending translation from 6. to 5.
• Move Go pending translation from 6. to 5.
• Move Rust pending translation from 6. to 5.

[hobovsky]

Kata 1., 2., and 3., all ask for a digital root. Kata 2. requires a bit of preprocessing, and kata 3. makes O(1) solutions tricky. Still, I am not sure if we need all of them, I would be fine with keeping only 1.

I am not sure if kata 5. is a duplicate of 1., because the task is slightly different. Maybe on this level of difficulty it might be worth keeping?
Kata 4. is annoying with its requirements, and is a duplicate of 5. It can go away, I vote retire.

Kata 6. is yet another bug fixing kata with discardable initial code and no real need for debugging. If it were retired in favor of 5., it has three unique languages to move. I have no strong opinion here: I don;t like bugfix kata which do not require debugging, but I can see how they can be interesting for some users.

[ejini6969]

Keep 1, 5. Retire the rest due to annoying input validation or solutions that can be directly retrieved (with a minor tweak, if any) from 1 or 5.

[Kacarott]

Keep 1 and 5

[benjaminzwhite]

Keep 1. Retire 2,3,4 agree with ejini.

I vote retire 5 - it's just 1 with abs() added, unless this is particularly interesting/challenging in other languages?

I personally like the 7-8 kyu debug katas like 6; sure you can discard the initial code but it's the kind of thing I'd like to solve when starting a new language. Also, if you solve it the "noob way" and it you then read about "smart way" in the solutions, I think that's a nice learning experience and it gets people engaged with the site.

[EloiseRosen]

5 - it's just 1 with abs() added

note that 5 also requires only 1 application of the summing process (99 -> 18 and stops there), while 1 requires continuing until the result has a length of 1. Not that that makes it interesting or necessarily worth keeping.

keep 1, idk about 5, retire the others

[hobovsky]

Since there are recurring opinions to keep 5., I think it's good to keep together with 1.