HashMap::get

pub fn get(K k) -> Option<V>

use collections::map::{HashMap};

Returns the value stored under k, or None when there is none.

Called on a HashMap value as value.get(…).

Parameters#

Returns#

Option<V>

Examples#

use collections::map::{HashMap};
use tests::assert;
let m: HashMap<string, int> = HashMap::new();
m.insert("a", 1);
assert!((m.get("a") ?? 0) == 1);
assert!(m.get("b").is_none());

See also#

• HashMap: A hash map from keys of type K to values of type V.
• HashMap::with_capacity: Creates an empty map with room for about cap buckets before it grows.
• HashMap::new: Creates an empty map.
• HashMap::size: Returns the number of entries.
• HashMap::is_empty: Returns true when the map has no entries.
• HashMap::capacity: Returns the number of buckets.
• HashMap::clear: Removes every entry, keeping the bucket count.
• HashMap::keys: Returns the keys, in insertion order.