# Io Reference

Databases / SkipDB / SkipDB

|  | An ordered key/value database implemented using a skiplist data structure.
|  | at(keySymbol) Returns a Sequence for the value at the given key or nil if there is no such key. atPut(keySymbol, valueSequence) Sets the value of valueSequence with the key keySymbol. Returns self. atRemove(keySymbol) Removes the specified key. Returns self cursor Returns a new cursor to enumerate the receiver. headerPid Returns the headerPid number. size Returns the number of keys in the receiver.