Example of interop between CSV.jl and DataPipes.jl

csv_datapipes_example.jl

using CSV
using DataPipes
using SplitApplyCombine

csv = """
x,y,z
1,3,5
1,2,4
2,4,1
"""

# We use `IOBuffer(csv)` in order to explain to `CSV.File` that provided string is a content.
# Otherwise it would be treated as a file name.

# This example reads data from csv and calculates number of occurences of `x` key.
@p begin
    IOBuffer(csv)
    CSV.File(↑)
    group(_.x)
    map(length)
end

# Result is
# 2-element Dictionaries.Dictionary{Any, Int64}
# 1 │ 2
# 2 │ 1