Ruby Read Csv File Line By Line

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.

Ruby read csv file line by line.

If you don t know how the ruby file class works. Here is the process in detail. How to read files in ruby. Read the file the whole file line by line or a specific amount of bytes.

Use the file class to open a file. Require csv csv read favorite foods csv or you can parse a string with csv. This is what a csv file looks like. This method will read the entire file and store it in the variable.

Close the file with the close method. Ruby comes with a built in csv library. You open a csv file for read write or append mode and use either or puts to append a new line. Ruby stores each table row as an array with each cell as a string element of the array.

Ruby comes with a standard library called csv to make it easy to read files with comman separated values. We use the csv. Read method and parse the file name as argument. Open the file with the open method.

See the example below. You can read a file directly. 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. Require csv customers csv read customers csv.

If it was a simpler file we could read it line by line and use split to cut it into parts but in this file there is a field that has a comman in it. Ruby provides csv support in the standard library and it will help us do most of the job very quickly.