std-macro-extensions 10.2.9

A collection of macro extensions for Rust's standard library data structures, simplifying the creation and manipulation of common collections such as HashMap, Vec, and more.
Documentation 
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/// Creates a new hash map instance.
///
/// # Arguments
///
/// - `expr` - The key-value pairs to initialize the hash map.
///
/// # Returns
///
/// - `HashMap<K, V>` - A new hash map containing the given key-value pairs.
#[macro_export]
macro_rules! hash_map {
    () => {
        std::collections::HashMap::new()
    };
    ($($key:expr => $val:expr),*) => {{
        std::collections::HashMap::from([$(($key, $val)),*])
    }};
}