Iterate over all numeric columns in DataFrames

Specific Domains Data
21

I corrected a misspoke about AbstractDataFrame before so you can read the correct distinction now.
Glad to be of help. I believe Julia zealots might say that if (cond) should be if cond, but it really comes down to your style if the code is for your use. :+1:

22 
any(isnan, col)

Should be faster, though my preferred style is

using MappedArrays
any(mappedarray(isnan, col))

or

import Base.Generator
any(Generator(isnan, col))
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