rustHow to create a Rust HashMap from a collection?

Creating a Rust HashMap from a collection is a simple process. First, create a vector of tuples containing the key and value. Then, use the collect() method to convert the vector into a HashMap.

let mut map = vec![("a", 1), ("b", 2), ("c", 3)].into_iter().collect::<HashMap<_, _>>();

The output of the above code is a HashMap with the keys a, b, and c and the corresponding values 1, 2, and 3:

{"a": 1, "b": 2, "c": 3}

The code consists of the following parts:

• vec![("a", 1), ("b", 2), ("c", 3)]: This creates a vector of tuples containing the keys and values.
• into_iter(): This converts the vector into an iterator.
• collect::<HashMap<_, _>>(): This collects the iterator into a HashMap.

Helpful links

• Rust HashMap Documentation
• Rust Collect Documentation

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