rustHow to declare a constant Rust HashMap?
A constant Rust HashMap can be declared using the const
keyword.
const MY_HASHMAP: HashMap<&str, i32> = [("a", 1), ("b", 2)].iter().cloned().collect();
This example creates a constant HashMap
with two entries, ("a", 1)
and ("b", 2)
. The HashMap
is of type HashMap<&str, i32>
, meaning it maps strings to integers.
const
: keyword used to declare a constantMY_HASHMAP
: name of the constantHashMap<&str, i32>
: type of the constant[("a", 1), ("b", 2)]
: entries in theHashMap
iter()
: creates an iterator over the entriescloned()
: clones the entriescollect()
: collects the entries into aHashMap
Helpful links
Related
- How to convert the keys of a Rust HashMap to a vector?
- How to get a reference to a key in a Rust HashMap?
- How to get all values from a Rust HashMap?
- How to get all keys from a Rust HashMap?
- How to check if a Rust HashMap contains a key?
- How to clear a Rust HashMap?
- How to use a Rust HashMap in a struct?
- How to implement PartialEq for a Rust HashMap?
- How to remove an element from a Rust HashMap if a condition is met?
- How to create a HashMap of structs in Rust?
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