Fast CSV reader based on Rust CSV crate

Installation

1. Install Rust

curl https://sh.rustup.rs -sSf | sh

Don't miss this message:

   Rust is installed now. Great!

   To get started you need Cargo's bin directory ($HOME/.cargo/bin) in your PATH 
   environment variable. Next time you log in this will be done automatically.

   To configure your current shell run source $HOME/.cargo/env

1. gem install xcsv

Usage

require 'xcsv'

# Enumerable
csv_reader = XSV.new("foo.csv")
csv_reader.each do |rec|
  rec #=> [col1, col2, col3, ...]
end

csv_reader = XSV.new("foo.csv")
csv_reader.take(10).to_a #=> [[col1, ...], [col1, ...], ...]

# while loop
csv_reader = XSV.new("bar.csv") 
while (rec = csv_reader.next) do
  rec #=> [col1, col2, col3, ...]
end

# Both forms will gunzip if file name ends with .gz
csv_reader = XSV.new("foo_bar.csv.gz") 
while (rec = csv_reader.next) do
  rec #=> [col1, col2, col3, ...]
end

Benchmarks

Code

# FastestCSV
FastestCSV.foreach('sample.csv') do |rec|
end

# XCSV
csv_reader = XCSV.new('sample.csv')
while (rec = csv_reader.next) do
end

# CSV
CSV.foreach('sample.csv') do |rec|
end

Parameters

Records	File size	CPU
1M	742M (426M .gz)	i7-6600U @ 2.60GHz

Elapsed time (secs):

FastestCSV	XCSV	XCSV (.gz)	CSV
10.1	12.4	20.7	50.5

Note: FastestCSV doesn't decode embedded newlines