Redis Lists: LINDEX
Redis LINDEX Command
Redis LINDEX command is used to get the element at index in the list stored at key. The index is zero-based, so 0 means the first element, 1 the second element and so on. Negative indices can be used to designate elements starting at the tail of the list. Here, -1 means the last element, -2 means the penultimate and so forth.
Here are some common uses and scenarios for the "LINDEX" command:
- Random Access: Retrieve elements from a list at specific positions.
- Data Inspection: Inspect the content of a list by accessing elements at various indices.
- Validation: Verify the presence and value of elements at specific positions in a list.
- Configuration Management: Access configuration values stored in list format by index.
- Session Management: Retrieve session data or user attributes stored in lists based on their position.
Syntax:
redis 127.0.0.1:6379> LINDEX KEY_NAME INDEX_POSITION
Available since
1.0.0.
Return Value
String reply, the requested element, or nil when the index is out of range.
Return Value Type
String
Example: Redis LINDEX
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> LINDEX mycolor1 0 "blue" 127.0.0.1:6379> LINDEX mycolor1 1 "red" 127.0.0.1:6379> LINDEX mycolor1 -1 "white" 127.0.0.1:6379> LINDEX mycolor1 -2 "black" 127.0.0.1:6379> LINDEX mycolor1 6 (nil)
Previous:
BRPOPLPUSH
Next:
LINSERT
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https://www.w3resource.com/redis/redis-lindex-key-index.php
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