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2025-11-27 rustaician notes
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‎journals/2025_11_27.md‎

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- [[Rust/prelude]]
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- [[Rust/use]]
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- [[Rust/std/result/Result]] - Result enum, its variants, methods, and usage patterns
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- [[Programming/Enum]] - general enum concept; implementations across multiple languages
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- [[Programming/Enum]] - general enum concept; implementations across multiple languages
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- [[Rust/Trait]]
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- [[Rust/crate/rand/Rng]]
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- [[cargo/doc/--open]] can build the documentation for your deps and open it in your browser. Cool!
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- [[Rust/match]]
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- [[Programming/Pattern Matching]] - created general pattern matching concept documentation
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‎pages/Anthropic___Model___Claude___4.5___Opus.md‎

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---
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alias:: [[claude-opus-4-5]], [[claude-opus-4.5]]
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tags:: [[AI/Model]]
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---
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- # [Claude Opus 4.5](https://www.anthropic.com/claude/opus)
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- ## Key Features
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- ## References
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- [Official documentation](https://www.anthropic.com/claude/opus)
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- [Claude in Microsoft Foundry](https://docs.claude.com/en/docs/build-with-claude/claude-in-microsoft-foundry)
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- [Claude Opus 4.5 in Amazon Bedrock](https://aws.amazon.com/blogs/machine-learning/claude-opus-4-5-now-in-amazon-bedrock/)
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- [Claude Opus 4.5 in Amazon Bedrock](https://aws.amazon.com/blogs/machine-learning/claude-opus-4-5-now-in-amazon-bedrock/)

‎pages/Programming___Pattern Matching.md‎

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- # Pattern Matching
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- A fundamental concept in programming that enables the examination and deconstruction of data structures based on their form
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- Allows developers to specify patterns to which data should conform
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- Facilitates concise and readable code for data extraction, transformation, and control flow
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- ## Definition
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- Involves checking a given sequence of tokens or data structures for the presence of constituents of some pattern
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- Unlike pattern recognition, which may allow approximate matches, pattern matching typically requires an exact match
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- Patterns can take the form of sequences or tree structures
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- ## Key Capabilities
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- **Locating patterns within data**: Finding specific structures or values
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- **Extracting components**: Destructuring data structures to access their parts
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- **Substituting matching patterns**: Replacing matched patterns with other sequences
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- **Control flow**: Directing program execution based on data structure
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- ## Language Implementations
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- ### Functional Languages
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- **Haskell, ML, Scala**: Use pattern matching extensively to destructure data types and control program flow
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- Pattern matching is often used in function definitions
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- Example (Haskell):
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- ~~~haskell
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factorial 0 = 1
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factorial n = n * factorial (n - 1)
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~~~
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- ### Object-Oriented Languages
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- **C#**: Introduced pattern matching in C# 7.0 for switch statements and expressions
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- **Java**: Added pattern matching features to enhance type checking and data extraction
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- ### Systems Languages
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- **Rust**: Uses pattern matching extensively with `match` expressions for safe data handling
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- **Swift**: Incorporates pattern matching for safer and more expressive code constructs
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- ### Scripting Languages
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- **Python**: Python 3.10 introduced structural pattern matching with `match`/`case` statements
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- Example (Python):
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- ~~~python
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match command:
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case ["move", x, y]:
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move_to(x, y)
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case ["draw", shape]:
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draw_shape(shape)
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case _:
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print("Unknown command")
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~~~
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- ## Historical Context
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- **Early Implementations**: Languages like SNOBOL (1962) and COMIT (1957) were among the first to introduce pattern matching, primarily for string manipulation
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- **Functional Programming**: The ML language (1973) and its successors integrated pattern matching as a core feature
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- **Modern Developments**: Many modern languages have incorporated pattern matching to provide safer and more expressive code constructs
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- ## Common Use Cases
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- **Destructuring**: Extracting values from complex data structures (tuples, structs, enums)
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- **Type checking**: Handling different types or variants in a type-safe manner
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- **Control flow**: Replacing if-else chains or switch statements with more expressive pattern-based logic
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- **Error handling**: Matching on error types and success cases
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- **Data transformation**: Converting between different data representations
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- ## Related
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- [[Rust/match]] - Pattern matching in Rust using `match` expressions
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- [[Programming/Enum]] - Enums are often used with pattern matching
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- [[Programming/Language/Feature]] - Pattern matching as a language feature
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- Functional programming concepts
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‎pages/Rust___Trait.md‎

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- like an Interface in [[Java]] or [[Py/Protocol]]
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- seems to be usually upper-cased like [[Rust/crate/rand/Rng]]
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- In this case, could think of Rng (Random Number Generator) like [[POSIX]]; it's a standard interface for which there are many distributions or variations
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- [Programming a Guessing Game - The Rust Programming Language](https://rust-book.cs.brown.edu/ch02-00-guessing-game-tutorial.html)
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- > This [`gen_range`] method is defined by the `Rng` trait that we brought into scope with the `use rand::Rng;` statement
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-
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‎pages/Rust___crate___rand___Rng.md‎

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- [Rng in rand - Rust](https://rust-random.github.io/rand/rand/trait.Rng.html)
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- Random Number Generator

‎pages/Rust___match.md‎

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- [`match`](https://rust-book.cs.brown.edu/ch06-02-match.html) expressions do [[Programming/Pattern Matching]]
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- consists of "arms"
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- example
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- ```rust
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match guess.cmp(&secret_number) {
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Ordering::Less => println!("Too small!"),
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Ordering::Greater => println!("Too big!"),
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Ordering::Equal => println!("You win!"),
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}
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```

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