Exercise 16. Reading and Writing Files

Image

If you did the Study Drills from the last exercise you should have seen all sorts of commands (methods/functions) you can give to files. Here’s the list of commands I want you to remember:

close – Closes the file. Like File->Save.. in your editor.

read – Reads the contents of the file. You can assign the result to a variable.

readline – Reads just one line of a text file.

truncate – Empties the file. Watch out if you care about the file.

write('stuff') – Writes “stuff” to the file.

For now, these are the important commands you need to know. Some of them take parameters, but we do not really care ...

Get Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition, Video Enhanced Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.