Package cache is a cache package written in Go with no dependency. It uses Least-Recently Used (LRU) algorithm for replacement policy. Behind the package, it uses doubly-linked list which is built-in data structure that comes from container/list. Any data can be stored in cache. Firstly, you need to create a new cache as follows. It takes one parameter that is capacity of the cache. For the example, the cache can keep up to 5 data. If a new data is being tried to add when the cache is full, the gcache removes the least-recently used one and adds the new data.