In this program, we will create a HashMap and then we will insert items into HashMap using the insert() function. After that, we will print only the keys of created HashMap.
The source code to print only keys of a HashMap is given below. The given program is compiled and executed successfully.
// Rust program to print only keys
// of a HashMap
use std::collections::HashMap;
fn main()
{
let mut map = HashMap::new();
map.insert("Key1", 101);
map.insert("Key2", 102);
map.insert("Key3", 103);
map.insert("Key4", 104);
println!("HashMap Keys:");
for key in map.keys() {
println!(" {}", key);
}
}
Output:
HashMap Keys:
Key1
Key4
Key2
Key3
Explanation:
Here we created a HashMap. Then we inserted the item into HashMap and printed the only keys of created HashMap using the keys() method.
Program/Source Code:
The source code to print only keys of a HashMap is given below. The given program is compiled and executed successfully.
Output:
Explanation:
Here we created a HashMap. Then we inserted the item into HashMap and printed the only keys of created HashMap using the keys() method.
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