LPOP, RPOP & LLEN

Now let's remove elements from lists.

Commands

• LPOP key — remove and return head. Returns bulk string or $-1\r\n if empty/missing
• RPOP key — remove and return tail
• LLEN key — return list length as integer (:0 for non-existing key)

Auto-delete Empty Lists

When all elements are popped, Redis automatically deletes the key. The key simply ceases to exist — EXISTS key returns :0, TYPE key returns +none.

Queue & Stack Patterns

• Queue (FIFO): RPUSH + LPOP (add right, take left)
• Stack (LIFO): LPUSH + LPOP (add left, take left)

These patterns are why Redis lists are so popular for job queues and message buffers.