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Reality Enjoyer
0b910bf74d
- create exercise string manipulator (shout out claude) - finish hacky solution (it almost works)
30 lines
1.3 KiB
Markdown
30 lines
1.3 KiB
Markdown
# Exercise: String Manipulator Tool
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**Concepts practiced:** String vs &str, ownership/borrowing, Vec operations, pattern matching
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**Objective:** Build a CLI tool that performs various string operations
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## Requirements:
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- Create a `StringTool` struct that holds a collection of strings
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- Implement methods:
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- `new()` - creates empty tool
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- `add_string(&mut self, s: String)` - adds string to collection
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- `longest(&self) -> Option<&str>` - returns longest string (or None if empty)
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- `contains_word(&self, word: &str) -> Vec<&str>` - returns strings containing the word
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- `to_uppercase_all(&mut self)` - converts all strings to uppercase in-place
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## Success criteria:
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- Code compiles without warnings
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- Test with: adding "hello", "world", "rust programming"
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- `longest()` should return "rust programming"
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- `contains_word("o")` should return vec!["hello", "world", "rust programming"]
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- After `to_uppercase_all()`, all strings should be uppercase
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## Stretch goal:
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Add a method `word_count(&self) -> HashMap<String, usize>` that counts total occurrences of each word across all strings
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## Getting Started:
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1. `cd exercises && cargo new string-manipulator`
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2. Focus on ownership: when do you need `String` vs `&str`?
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3. Think about borrowing: methods that read vs modify
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Expected time: 45-60 minutes |