/// <summary>
/// Atomically removes a set of keys from the map
/// </summary>
/// <param name="keys">Keys to remove</param>
/// <returns>New map with the items removed</returns>
public Map <K, V> RemoveRange(IEnumerable <K> keys)
{
var self = Root;
foreach (var key in keys)
{
self = MapModule.Remove(self, key, Comparer <K> .Default);
}
return(SetRoot(self));
}
/// <summary>
/// Atomically removes an item from the map
/// If the key doesn't exists, the request is ignored.
/// </summary>
/// <param name="key">Key</param>
/// <returns>New map with the item removed</returns>
public Map <K, V> Remove(K key) =>
isnull(key)
? this
: SetRoot(MapModule.Remove(Root, key, Comparer <K> .Default));