rustHow to convert a Rust HashMap to a BTreeMap?

To convert a Rust HashMap to a BTreeMap, you can use the .into_iter() method to iterate over the HashMap and the .collect() method to collect the elements into a BTreeMap.

Example code

let mut hashmap = HashMap::new();
hashmap.insert("a", 1);
hashmap.insert("b", 2);

let btreemap: BTreeMap<_, _> = hashmap.into_iter().collect();

Output example

btreemap = {"a": 1, "b": 2}

Code explanation

1. let mut hashmap = HashMap::new();: This line creates a new empty HashMap called hashmap.
2. hashmap.insert("a", 1);: This line inserts a key-value pair ("a", 1) into the HashMap.
3. hashmap.insert("b", 2);: This line inserts a key-value pair ("b", 2) into the HashMap.
4. let btreemap: BTreeMap<_, _> = hashmap.into_iter().collect();: This line uses the .into_iter() method to iterate over the HashMap and the .collect() method to collect the elements into a BTreeMap.

Helpful links

• Rust HashMap documentation
• Rust BTreeMap documentation

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