Deduplicate - thousands separators

[hobovsky]

From #39

In all below challenges, "Formatting" means using a comma as thousands separator, unless specified otherwise.

1. Number Format

• 6 kyu
• Input: positive and negative, up to ~10 digits or so.
• Satisfaction: 88% with 3,294 solutions
• 1 pending issue
• 7 languages, 3 pending translations
• Published: Nov 30, 2015
• Author last seen: Dec 2015

2. Grouped by commas

• 6 kyu
• Input: positive integers.
• Satisfaction: 93% with 10,170 solutions
• 4 pending issues
• 13 languages, 2 pending translations
• Published: Nov 2, 2013
• Author last seen: Oct 2017

3. Converting integer to currency format

• 7 kyu
• Inputs are non-negative integers.
• Satisfaction: 91% with 4,041 solutions
• 1 pending issue
• 6 languages, no pending translations
• Published: Feb 22, 2015
• Author last seen: Aug 2016

4. Add commas to a number

• 6 kyu
• input: positive and negative floating point numbers, output: rounded to 3 decimal places
• Satisfaction: 84% with 814 solutions
• No pending issues
• 2 languages, 1 pending translations
• Published: Jan 21, 2016
• Author last seen: May 2016

5. Display Large Numbers

• 7 kyu
• input: numeric strings or positive integers (not large)
• Satisfaction: 85% with 283 solutions
• No pending issues
• JS only
• Published: Oct 4, 2016
• Author last seen: Apr 2018

6. Formatting a number as price

• 5 kyu
• input: anything, output: 'NaN' for non-numerics, output: format to strictly 2 decimal places
• Satisfaction: 85% with 2,003 solutions
• 3 pending issues
• JS only + 2 pending translations
• Published: Mar 6, 2014
• Author last seen: Dec 2021

[hobovsky]

From 2,3, and 5, I think I would keep only 2 as the most complete. I'd retire 3 as very similar to 2 and unnecessarily distracting with the currency thing. I'd retire 5 as the least complete, with unnecessary mixed type inputs.

I do not know what to do with 1. It is very similar to 2, differs only by having negative numbers. Maybe keep it instead of 2, 3, and 5?

I am also not sure what to do with 4. I do not like it because handling of the decimal part is underspecified (rounding mode, zero-padded or not), and if it would be kept, it would have to be improved a bit.

I do not like 6 because it's quite messy. I think it could be retired.

[Kacarott]

I agree with retire 6, it is messy and over ranked. From 1-5 I think keep either 1 or 2, retire the rest.

[monadius]

Keep 2 only. 2 has many translations and negative numbers in 1 do not add much to the task.