rustHow to loop through a Rust HashMap?
Looping through a Rust HashMap can be done using the iter()
method. This method returns an iterator over the key-value pairs of the map. The following example code block shows how to loop through a HashMap and print out the key-value pairs:
use std::collections::HashMap;
fn main() {
let mut map = HashMap::new();
map.insert("a", 1);
map.insert("b", 2);
map.insert("c", 3);
for (key, value) in map.iter() {
println!("{}: {}", key, value);
}
}
Output example
a: 1
b: 2
c: 3
The code above consists of the following parts:
use std::collections::HashMap;
- imports theHashMap
type from thestd::collections
module.let mut map = HashMap::new();
- creates a new emptyHashMap
and stores it in themap
variable.map.insert("a", 1);
- inserts a key-value pair into themap
variable.for (key, value) in map.iter() {
- starts a loop over the key-value pairs of themap
variable.println!("{}: {}", key, value);
- prints out the key-value pairs.
Helpful links
Related
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- How to remove an element from a Rust HashMap if a condition is met?
- How to use a tuple as a key in a Rust HashMap?
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- How to use a Rust HashMap in a multithreaded environment?
- How to convert a Rust HashMap to a BTreeMap?
- How to create a HashMap of HashMaps in Rust?
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