Deduplicate - Church numerals

[hobovsky]

From wiki list of duplicates.

1. Church numbers

• 4 kyu
• Requested operations are add, mul, pow. Numbers are two-argument uncurried functions. Provides some helpers to convert between Church and int.
• 94% with 170+ completions
• 1 pending issue
• 1 language (JS), 1 pending translation (C++)
• Published Nov 2014, author active

2. Church numbers (ii)

• 3 kyu
• Same as 1., but operations are pred sub compareTo div mod
• 84% with ~100 completions
• 2 pending issues
• 1 language (JS)
• Published Nov 2014, author the same as for kata 1.

3. Church numbers

• 4 kyu
• Requested operations are add mul pow. Provides zero, one, and succ. Uses normal, curried functions.
• 94% with ~360 completions
• No pending issues
• 4 languages
• Published Nov 2014, author active

4. Church Numbers - Add, Multiply, Exponents

• 3 kyu
• Requested operations are add mul pow. Provides zero, succ, and functions to convert Church <=> int. Solution is spoiled by the description.
• 81% with 1k completions
• No pending issues
• 3 languages
• Published Aug 2015, author active

5. Church numbers: find the predecessor and subtract

• 4 kyu
• Requested operations are pred sub. Provides zero, one, and succ. Uses normal, curried functions.
• 92% with ~200 completions
• 1 pending issue
• 4 languages
• Published Nov 2014, author the same as for kata 3.

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Conclusion

• Keep 3. Church numbers
• Keep 5. Church numbers: find the predecessor and subtract
• Retire 1. Church numbers after C++ translation is moved
• Retire 2. Church numbers (ii)
• Retire 4. Church Numbers - Add, Multiply, Exponents

Filling gaps

• Move approved Python translation form 4. to 3.
• Move pending C++ translation from 1. to 3.

[Kacarott]

1 and 2 are abominations which require un-curried arguments. Number 4 is horrendously overranked and essentially has the solution in the description.

Therefore I vote to keep 3 and 5, retire the rest.

Edit: Another idea would be to retire all of them, and create new kata with all operations. Or convert either 3 or 5 to use all operations.

[JohanWiltink]

Kill off 1, 2, 4; keep 3, 5.

I see no harm in keeping the current 3 and 5; also, authoring PS translations was not fun when I did it - I won't do it again.

All are overrated, but I don't see much harm in that either - lure people in with cheap points. 😋

[JohanWiltink]

Note that 3 and 5, in their JS versions, require LC syntax. Haskell and PS syntax already is reasonably close to LC syntax, though some sugar is available there.

4 is the only one to have Python. A syntax checker for Python is available on some other LC kata ( 🥕 wrote that ); 3 and 5 ( if those are kept ) might benefit from a Python translation with syntax check. Python lambdas are quite suited to expressing LC.

[lsnbr]

Keep 3 and 5, same reasons as already said