GET
Syntax
GET key
Time complexity: O(1)
Get the value of key.
If the key does not exist the special value nil is returned.
An error is returned if the value stored at key is not a string, because GET
only handles string values.
Return
Bulk string reply: the value of key, or nil when key does not exist.
Examples
dragonfly> GET nonexisting
(nil)
dragonfly> SET mykey "Hello"
"OK"
dragonfly> GET mykey
"Hello"