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Tasks in memory: add, rename, complete, remove
Lesson 37. Carry out four task actions and see how removal shifts list positions.
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Publishing archive
Wednesday, 23 September 2026
Wednesday
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 |
The highlighted days are the ones with something published; those are clickable.
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Checkpoint: an organizer in memory
Lesson 40. Run an interactive organizer, perform several commands in one session, and handle invalid input.
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A command as a checked intention
Lesson 36. Separate parsing launch words from acting on the organizer and explain each error.
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Task IDs: numbers that do not shift
Lesson 38. Give each task a stable ID and never reuse it after removal.
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Scenarios: test a sequence of actions
Lesson 39. Check consequences of several actions and errors that must leave data unchanged.
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Launch arguments: a command and a title with spaces
Lesson 35. Give the organizer an action and title when starting it from the terminal.
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Option: when a record might be absent
Lesson 31. Look up a title by position without crashing when that position does not exist.
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The question mark: return an error to the caller
Lesson 33. Parse minutes first, then check their meaning and return a useful error.
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Result: explain a failed operation
Lesson 32. Turn text into a number of minutes and explain invalid input without stopping the program.
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Terminal input: a line, an empty answer and end of input
Lesson 34. Read a task title and distinguish a blank line, end of input and a read error.
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Tuples: two results from one function
Lesson 26. Return a task title and its duration together without mixing up the values.
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The Task struct: data with useful names
Lesson 27. Put a task's title, duration and completion state into one type of your own.
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Methods: actions beside Task
Lesson 28. Create a task, read its state and finish it through methods.
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match: handle every variant
Lesson 30. Read a task state fully and catch a missing case before running the program.
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Enums: one valid task state at a time
Lesson 29. Represent a task's state with one named variant that may carry extra data.
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Text, UTF-8, and visible letters
Lesson 25. Distinguish bytes, `char` values, and visible letters in a task title.
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A growable list: Vec
Lesson 24. Add and remove task titles without fixing the number of slots in advance.
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Mutable borrowing
Lesson 21. Change a string through a function and explain when other access becomes available again.
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String and &str: storing and reading
Lesson 22. Choose an owned string for storage and a text view for reading.
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Slices: part of data without a copy
Lesson 23. Pass part of a numeric collection to a function without building another array.
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Practice: a small summary
Lesson 17. Build and test a task summary independently using familiar syntax.
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Ownership and moves
Lesson 19. Explain why an old name becomes unavailable after passing a String value.
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Borrowing for reading
Lesson 20. Let a function read a string while its owner keeps using it.
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Values and memory
Lesson 18. Distinguish a value, its owner, and the storage it may use.