If else simplification

[jkrumbiegel]

This is just a suggestion, feel free to close if you think the original is more readable.
I saw there were very long if else statements, sometimes only one line is different.
You can express that via the @nif macro quite well, so I shortened the code with it.

[codecov]

Codecov Report

Merging #22 (fb2aec1) into main (fe71c4f) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   99.91%   99.88%   -0.03%     
==========================================
  Files           8        8              
  Lines        1176      903     -273     
==========================================
- Hits         1175      902     -273     
  Misses          1        1              

Impacted Files	Coverage Δ
src/columns.jl	100.00% <100.00%> (ø)
src/table.jl	100.00% <100.00%> (ø)

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[junyuan-chen]

@jkrumbiegel Thank you for making this suggestion. This looks good to me! I wasn't aware of such a macro that could save my manual repetition.

[jkrumbiegel]

All the macros starting with n in Base.Cartesian are pretty good if you're in such a situation :)