BITCOUNT : Count the number of bits set in given string

Synax

BITCOUNT key

Returns the number of bits set in given string.

BITCOUNT key start end

Returns the number of bits set in given string from start offset to end offset.

Returns

Returns the number of bits set in given string.

127.0.0.1:6379> set myKey "a" 
OK 
127.0.0.1:6379> bitcount myKey 
(integer) 3 
127.0.0.1:6379> set myKey "hello" 
OK 
127.0.0.1:6379> get myKey 
"hello" 
127.0.0.1:6379> bitcount myKey 
(integer) 21 

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