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improve names docstring #3178

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Sep 25, 2022
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improve names docstring #3178

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improve names docstring
bkamins Sep 24, 2022
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Update src/abstractdataframe/abstractdataframe.jl
bkamins Sep 25, 2022
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4 changes: 3 additions & 1 deletion src/abstractdataframe/abstractdataframe.jl
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Expand Up @@ -39,7 +39,9 @@ Return a freshly allocated `Vector{String}` of names of columns contained in `df
If `cols` is passed then restrict returned column names to those matching the
selector (this is useful in particular with regular expressions, `Cols`, `Not`, and `Between`).
`cols` can be:
* any column selector ($COLUMNINDEX_STR; $MULTICOLUMNINDEX_STR)
* any column selector ($COLUMNINDEX_STR; $MULTICOLUMNINDEX_STR); these column
selectors are documented in [General rules](@ref) section of the [Indexing](@ref)
part of the DataFrames.jl documentation
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* a `Type`, in which case names of columns whose `eltype` is a subtype of `T`
are returned
* a `Function` predicate taking the column name as a string and returning `true`
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