rustHow to create struct from hashmap in Rust

Creating a struct from a hashmap in Rust is a simple process. To do this, you can use the collect() method on the hashmap. This will return a Result containing either an Err or an Ok value. If the Ok value is returned, it will contain a HashMap<K,V> where K and V are the types of the keys and values in the original hashmap.

Example code

let mut map = HashMap::new();
map.insert("key1", "value1");
map.insert("key2", "value2");

let result = map.collect::<HashMap<&str, &str>>();

match result {
    Ok(map) => println!("{:?}", map),
    Err(e) => println!("Error: {}", e),
}

Output example

{"key1": "value1", "key2": "value2"}

Code explanation

• let mut map = HashMap::new();: creates a new empty hashmap
• map.insert("key1", "value1");: inserts a key-value pair into the hashmap
• map.collect::<HashMap<&str, &str>>();: collects the hashmap into a Result containing either an Err or an Ok value
• match result {: matches the Result to determine if it is an Err or an Ok value
• Ok(map) => println!("{:?}", map): if the Ok value is returned, it will print out the hashmap
• Err(e) => println!("Error: {}", e): if the Err value is returned, it will print out an error message

Helpful links

• Rust HashMap Documentation
• Rust Collect Method Documentation

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