File.write for writing in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does File.write do in Ruby?

File.write writes the given content to a file. If the file doesn't exist, it creates it. If it exists, it overwrites the content.

beginner

How do you write the string "Hello" to a file named "greeting.txt" using File.write?

File.write("greeting.txt", "Hello")

beginner

What happens if you use File.write on an existing file?

The existing file's content is replaced with the new content you provide.

intermediate

Can File.write append content to a file?

No, File.write overwrites the file. To append, you need to use other methods like File.open with append mode.

intermediate

What value does File.write return after writing to a file?

It returns the number of bytes written to the file.

What does File.write('example.txt', 'Hi') do if 'example.txt' does not exist?

A Creates 'example.txt' and writes 'Hi' inside

B Throws an error because the file doesn't exist

C Appends 'Hi' to the file

D Deletes the file

File.write creates the file if it doesn't exist and writes the content.

If 'data.txt' contains 'Old', what will File.write('data.txt', 'New') do?

A Overwrite 'Old' with 'New'

B Append 'New' after 'Old'

C Throw an error

D Create a new file named 'data.txt1'

File.write overwrites existing content.

What does File.write return after writing to a file?

A The file name

B The content written

C Nothing (nil)

D The number of bytes written

It returns the number of bytes written to the file.

Which method should you use to add content to the end of a file instead of overwriting?

A File.write

B File.read

C File.open with append mode

D File.delete

Use File.open with append mode ('a') to add content.

What happens if you pass a non-string object to File.write as content?

A It writes the object as is

B It converts the object to string and writes it

C It throws an error

D It ignores the content

File.write converts the content to string before writing.

Explain how File.write works for writing content to files in Ruby.

Think about what happens if the file exists or not.

Describe the difference between File.write and appending content to a file.

Consider how to keep old content and add new content.