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Basic Undo and Redo
Estimated time: 10 minutes
Task Instructions
Master the fundamental undo (u) and redo (Ctrl-r) commands
Practice making changes to the code, then use 'u' to undo them and 'Ctrl-r' to redo. Follow the TODO items to experience how Vim's undo system works.
Learning objectives
- Master the fundamental undo (u) and redo (Ctrl-r) commands
- Build confidence in experimenting with commands
- Understand Vim's change grouping
Required Keystrokes
This lesson requires you to use specific keystrokes to complete it. Your submission will be evaluated based on whether you used the required keystrokes mentioned below, rather than matching a specific output.
u
Use undo command
\<C-r\>
Use redo command (Ctrl-r)
What This Means
- Your solution must include the required keystroke patterns
- The order of keystrokes may matter depending on the exercise
- You'll still need to achieve the expected output
- This helps you practice specific Vim techniques
Helpful commands:
| Command | Description |
|---|---|
| u | Undo last change |
| Ctrl-r | Redo last undone change |
| 3u | Undo 3 changes |
Hints
- Remember: 'u' undoes the last change, 'Ctrl-r' redoes. You can press 'u' multiple times.
# Undo/Redo Practice
# Make changes to this code and practice undoing and redoing them
def calculate_total(items):
total = 0
for item in items:
total += item.price
return total
# TODO: Make these changes, then practice undoing:
# 1. Change 'calculate_total' to 'compute_sum'
# 2. Change 'total' to 'sum' on line 4
# 3. Delete the entire for loop
# 4. Press 'u' three times to undo all changes
# 5. Press 'Ctrl-r' to redo one change
# 6. Press 'u' again to get back to original