rustHow to implement a HashMap in Rust?
A HashMap in Rust can be implemented using the HashMap
type from the std::collections
module.
use std::collections::HashMap;
let mut map = HashMap::new();
map.insert("key1", "value1");
map.insert("key2", "value2");
println!("{:?}", map);
Output example
{"key1": "value1", "key2": "value2"}
The code above creates a new HashMap
and inserts two key-value pairs into it. The insert
method takes two parameters, the key and the value, and adds them to the map. The println!
macro prints the contents of the map.
Parts of the code:
use std::collections::HashMap;
: imports theHashMap
type from thestd::collections
module.let mut map = HashMap::new();
: creates a newHashMap
and assigns it to themap
variable.map.insert("key1", "value1");
: inserts a key-value pair into the map.println!("{:?}", map);
: prints the contents of the map.
Helpful links
Related
- How to implement PartialEq for a Rust HashMap?
- How to print a Rust HashMap?
- How to create a HashMap of structs in Rust?
- How to sort a Rust HashMap?
- How to compare two Rust HashMaps?
- How to lock a Rust HashMap?
- How to clear a Rust HashMap?
- How to check if a Rust HashMap contains a key?
- How to build a Rust HashMap from an iterator?
- How to use a custom hash function with a Rust HashMap?
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