rustHow to use a Rust HashMap in a struct?
A Rust HashMap can be used in a struct by declaring a field of type HashMap<K, V>
where K
is the type of the key and V
is the type of the value.
Example code
use std::collections::HashMap;
struct MyStruct {
map: HashMap<String, i32>,
}
fn main() {
let mut my_struct = MyStruct {
map: HashMap::new(),
};
my_struct.map.insert("key".to_string(), 1);
println!("{:?}", my_struct);
}
Output example
MyStruct { map: {"key": 1} }
Code explanation
-
use std::collections::HashMap;
: This imports theHashMap
type from thestd::collections
module. -
map: HashMap<String, i32>
: This declares a field of typeHashMap<String, i32>
in theMyStruct
struct. -
HashMap::new()
: This creates a new emptyHashMap
instance. -
my_struct.map.insert("key".to_string(), 1);
: This inserts a key-value pair into theHashMap
instance.
Helpful links
Related
- How to remove an element from a Rust HashMap if a condition is met?
- How to implement PartialEq for a Rust HashMap?
- How to sort a Rust HashMap?
- How to use an enum in a Rust HashMap?
- How to print a Rust HashMap?
- How to create a new Rust HashMap with values?
- How to convert the keys of a Rust HashMap to a vector?
- How to convert a Rust HashMap to JSON?
- How to insert an element into a Rust HashMap if it does not already exist?
- How to clear a Rust HashMap?
More of Rust
- How to replace a capture group using Rust regex?
- How to use regex captures in Rust?
- How to use named capture groups in Rust regex?
- How to use regex with bytes in Rust?
- How to use regex to match a double quote in Rust?
- How to implement PartialEq for a Rust HashMap?
- How to match the end of a line in a Rust regex?
- How to parse JSON string in Rust?
- How to convert a Rust slice to a fixed array?
- How to calculate the inverse of a matrix in Rust?
See more codes...