Redis Lists: LLEN

Redis LLEN Command

Redis LLEN command returns the length of the list stored at key. If a key does not exist, it is interpreted as an empty list and 0 is returned. An error is returned when the value stored at key is not a list.

Here are some common uses and scenarios for the "LLEN" command:

• Size Retrieval: Determine the number of elements in a list.
• Data Validation: Validate list size for consistency and correctness.
• Capacity Monitoring: Monitor the length of lists to manage capacity and performance.
• Conditional Logic: Execute operations based on the length of a list.
• Resource Management: Manage resources by tracking the size of lists for optimization.

Syntax:

LLEN KEY_NAME     

Available since

1.0.0.

Return Value

Integer replies the length of the list at a key.

Return Value Type

Integer

Example: Redis LLEN

127.0.0.1:6379> LPUSH mycolor1 white black red blue
(integer) 4
127.0.0.1:6379> LRANGE mycolor1 0 -1
1) "blue"
2) "red"
3) "black"
4) "white"
127.0.0.1:6379> LLEN mycolor1
(integer) 4

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