implementation 'it.sephiroth.android.library.cache:simple-lru-cache:**version**' 

 // creates a new string lru-cache of 3 elements max val cache = LruCache<String>(3) cache[0] = "first" cache[1] = "second" cache[2] = "third" cache[3] = "fourth" // key `0` is removed val entry = cache[1] // returns `second` val entry2 = cache[0] // returns null cache.erase(1) // key `1` is removed (now size is 2)