Sets field in the hash stored at key to value, only if field does not yet exist. If key does not exist, a new key holding a hash is created. If field already exists, this operation has no effect.

@return

@integer-reply, specifically:

• 1 if field is a new field in the hash and value was set.
• 0 if field already exists in the hash and no operation was performed.

@examples

HSETNX myhash field "Hello"
HSETNX myhash field "World"
HGET myhash field