IO modes (r, w, a) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a file for reading.

Ruby

file = File.open('example.txt', '[1]')

Drag options to blanks, or click blank then click option'

Aw

Br

Ca

Dx

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'w' will erase the file content.

Using 'a' opens the file for appending, not reading.

Use mode 'r' to open a file for reading only.

2fill in blank

medium

Complete the code to open a file for writing (overwriting existing content).

Ruby

file = File.open('output.txt', '[1]')

Drag options to blanks, or click blank then click option'

Aa

Br

Cw

Dr+

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'r' will cause an error if the file does not exist.

Using 'a' will append instead of overwrite.

Use mode 'w' to open a file for writing and overwrite existing content.

3fill in blank

hard

Fix the error in the code to open a file for appending text.

Ruby

file = File.open('log.txt', '[1]')

Drag options to blanks, or click blank then click option'

Aw

Bw+

Cr

Da

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'w' erases the file content.

Using 'r' opens for reading only, no writing allowed.

Use mode 'a' to open a file for appending text at the end.

4fill in blank

hard

Fill both blanks to open a file for reading and writing without erasing content.

Ruby

file = File.open('data.txt', '[1]')
file.write('Hello') if file.[2]

Drag options to blanks, or click blank then click option'

Ar+

Bw

Cwritable?

Dreadable?

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'w' erases the file content.

Checking readable? does not confirm writing permission.

Mode 'r+' opens for reading and writing without erasing. Use writable? to check if writing is allowed.

5fill in blank

hard

Fill all three blanks to open a file for appending, write a line, and close the file.

Ruby

file = File.open('notes.txt', '[1]')
file.[2]('New note\n')
file.[3]

Drag options to blanks, or click blank then click option'

Aa

Bwrite

Cclose

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'w' erases existing content.

Forgetting to close the file can cause data loss.

Use mode 'a' to append, write to add text, and close to save and close the file.