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Add example of types taking a function #1015

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Sep 9, 2022
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Add example of types taking a function #1015

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13 changes: 13 additions & 0 deletions docs/src/examples.md
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Original file line number Diff line number Diff line change
Expand Up @@ -603,6 +603,19 @@ file = CSV.File(IOBuffer(data); types=Dict("col3" => Int))
file = CSV.File(IOBuffer(data); types=[Int, Int, Int])
file = CSV.File(IOBuffer(data); types=[Int, Int, Int], silencewarnings=true)
file = CSV.File(IOBuffer(data); types=[Int, Int, Int], strict=true)


# In this file we have lots of columns, and would like to specify the same type for all
# columns except one which should have a different type. We can do this by providing a
# function that takes the column index and column name and uses these to decide the type.
data = """
col1,col2,col3,col4,col5,col6,col7
1,2,3,4,5,6,7
0,2,3,4,5,6,7
1,2,3,4,5,6,7
"""
file = CSV.File(IOBuffer(data); types=(i, name) -> i == 1 ? Bool : Int8)
file = CSV.File(IOBuffer(data); types=(i, name) -> name == :col1 ? Bool : Int8)
```

## [Typemap](@id typemap_example)
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