rustHow to create a new Rust HashMap with values?
Creating a new Rust HashMap with values is easy. You can use the collect()
method to create a HashMap from a vector of key-value pairs.
let mut map = vec![("a", 1), ("b", 2), ("c", 3)].into_iter().collect::<HashMap<_, _>>();
This code creates a HashMap with the keys "a"
, "b"
, and "c"
and the corresponding values 1
, 2
, and 3
.
The code consists of the following parts:
let mut map =
: This declares a mutable variablemap
to store the HashMap.vec![("a", 1), ("b", 2), ("c", 3)]
: This creates a vector of key-value pairs..into_iter()
: This converts the vector into an iterator..collect::<HashMap<_, _>>()
: This collects the iterator into a HashMap.
Helpful links
Related
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- How to insert an element into a Rust HashMap if it does not already exist?
- How to use a tuple as a key in a Rust HashMap?
- How to convert a Rust HashMap to JSON?
- How to convert a Rust HashMap to a BTreeMap?
- How to use a HashBrown with a Rust HashMap?
- How to implement PartialEq for a Rust HashMap?
- How to use a Rust HashMap in a multithreaded environment?
- How to convert a Rust HashMap to a JSON string?
- How to use an enum in a Rust HashMap?
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