concept LISTs in category redis

This is an excerpt from Manning's book Redis in Action. Login to get full access to this book.

In the world of key-value stores, Redis is unique in that it supports a linked-list structure. LISTs in Redis store an ordered sequence of strings, and like STRINGs, I represent figures of LISTs as a labeled box with list items inside. An example of a LIST can be seen in figure 1.2.

Figure 1.2. An example of a LIST with three items under the key, list-key. Note that item can be in the list more than once.

The operations that can be performed on LISTs are typical of what we find in almost any programming language. We can push items to the front and the back of the LIST with LPUSH/RPUSH; we can pop items from the front and back of the list with LPOP/RPOP; we can fetch an item at a given position with LINDEX; and we can fetch a range of items with LRANGE. Let’s continue our Redis client interactions by following along with interactions on LISTs, as shown in listing 1.2. Table 1.4 gives a brief description of the commands we can use on lists.