1. Arc<T> — share ownership across threads
Concept: Atomically reference-counted shared ownership.
Arc<T> allows multiple threads to share ownership of the same data safely. Unlike Rc<T>, Arc<T> uses atomic reference counting and is suitable for multithreaded programs.
1. Async/Await — write asynchronous functions
Concept: Asynchronous programming with Rust.
async defines an asynchronous function, while .await waits for its future to produce a result. Rust requires an asynchronous runtime, such as Tokio, to execute this program.
1. Async/Await — write asynchronous functions
Concept: Asynchronous programming with Rust.
async defines an asynchronous function, while .await waits for its future to produce a result. Rust requires an asynchronous runtime, such as Tokio, to execute this program.
4. filter_map() — filter and transform simultaneously
Concept: Filter out unwanted values while transforming the remaining elements.
parse() returns a Result. The .ok() converts it into an Option, and filter_map() keeps only successful conversions.
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1. Box<T> — store data on the heap
Concept: A Box<T> owns a value stored on the heap.
Box::new() creates a box that owns its value on the heap. Rust automatically cleans it up when the box goes out of scope.
2. Option::map — transform a value if it exists
Concept: Transform the value inside an Option without manually matching every case.
map() applies a function to the value inside Some. If the original value is None, the result remains None.
2. Option::map — transform a value if it exists
Concept: Transform the value inside an Option without manually matching every case.
map() applies a function to the value inside Some. If the original value is None, the result remains None.
Iterating over &scores borrows the map rather than consuming it. Remember that HashMap iteration order is not guaranteed, so the output order may vary.
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