Lists

Redis Lists

A Redis list is a linked list of strings. Elements can be added to or removed from either end efficiently — making lists ideal for queues, stacks, and activity feeds.

LPUSH and RPUSH — Add Elements

• LPUSH key elem [elem ...] — push to the left (head) of the list
• RPUSH key elem [elem ...] — push to the right (tail) of the list

Both return the new length of the list.

RPUSH tasks "email" "report" "backup"
LLEN tasks

Output:

(integer) 3
(integer) 3

When pushing multiple elements, they are added in the order given (for RPUSH) or in reverse (for LPUSH).

LRANGE — Get a Range

LRANGE key start stop returns elements from index start to stop (inclusive). Indices are 0-based; negative indices count from the end:

RPUSH fruits "apple" "banana" "cherry"
LRANGE fruits 0 -1    -- all elements
LRANGE fruits 0 1     -- first two
LRANGE fruits -2 -1   -- last two

Output:

(integer) 3
1) "apple"
2) "banana"
3) "cherry"
1) "apple"
2) "banana"
1) "banana"
2) "cherry"

LPOP and RPOP — Remove Elements

Pop (remove and return) from either end:

LPOP tasks         -- remove and return first element
RPOP tasks         -- remove and return last element

LPOP tasks 2       -- remove and return first 2 elements

LLEN — List Length

LLEN tasks

Patterns

Queue (FIFO): RPUSH to enqueue, LPOP to dequeue.

RPUSH queue "job1" "job2" "job3"
LPOP queue    -- "job1" (first in, first out)

Stack (LIFO): RPUSH to push, RPOP to pop.

RPUSH stack "a" "b" "c"
RPOP stack    -- "c" (last in, first out)

Activity Feed: LPUSH new events, LRANGE to get recent events.

LPUSH feed:user1 "liked post 42" "commented on 17"
LRANGE feed:user1 0 9    -- latest 10 events

Your Task

Create a queue called jobs. RPUSH three jobs: "build", "test", "deploy". Then use LRANGE to see all jobs.