HashMap::contains

pub fn contains(K k) -> bool

use collections::map::{HashMap};

Returns true when the map has an entry for k.

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

Parameters#

Returns#

bool

Examples#

use collections::map::{HashMap};
use tests::assert;
let m: HashMap<int, bool> = HashMap::new();
m.insert(7, false);
assert!(m.contains(7));
assert!(!m.contains(8));

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.