Ruby comes with a built in csv library.
Ruby read csv file.
October 09 2015 4 minute read.
Although there are various ways to achieve the same results we will be focusing in just 2 of the possible ways read the file entirely with the read method or line by line with the foreach method.
Each approach has its own pros.
Id name 1 chocolate 2 bacon 3 apple 4 banana 5 almonds now you re going to learn how to use the ruby csv library to read write csv files.
You can read a file directly.
Each row and the comma separated strings within each row can be thought of as a single record in a database.
You can use the block to append csv rows to the string and when the block exits the final string will be returned.
This method wraps a string you provide or an empty default string in a csv object which is passed to the provided block.
Ruby alternatives for parsing csv files.
Ruby provides csv support in the standard library and it will help us do most of the job very quickly.
Csv stands for comma separated values and csv files contain rows of text.
Ruby string split slow built in csv ok recommended ccsv fast recommended if you have control over csv format csvscan fast recommended if you have control over csv format excelsior fast recommended if you have control over csv format csv library benchmarks can be found here and here.
Each row has strings separated by commas.
Ruby comes with a standard library called csv to make it easy to read files with comman separated values csv file in this csv file the 3rd fields in every row is a number.
Today in this intermediate level tutorial we look at different ways to process and manipulate csv files.
This library provides a complete interface to csv files and data.
It offers tools to enable you to read and write to and from strings or io objects as needed.
In ruby you can import your csv file either at once storing all of the file content in memory or read from it row by row.
Each approach has its own pros and cons.
Csv is an important file type for data base management and ruby makes it easy for programmers to work with csv files.
Add this line to your application s gemfile.
Note that a passed string is modified by this method.
Require csv csv read favorite foods csv or you can parse a string with csv.
Csv ruby 2 6 1.
Call dup before passing if you need a new string.
