# LRU Eviction
> Explore LRU eviction policies in @humanspeak/memory-cache with an interactive demo showing max-size behavior and expired-entry pruning in apps.
**Source:** [https://memory.svelte.page/examples/lru-eviction](https://memory.svelte.page/examples/lru-eviction)
**Markdown mirror:** [https://memory.svelte.page/examples/lru-eviction.md](https://memory.svelte.page/examples/lru-eviction.md)
---
This mirror preserves the prose, implementation notes, and runnable Svelte source behind the live example page.
## FIG-001: trace lru eviction.
Fill a bounded `MemoryCache`, access entries, and watch how expired entries are reclaimed before least recently used valid keys leave.
**Metadata:** tag: `EVICTION-POLICY` | pattern: `least recently used`
### Notes
- LRU means `least recently used`: the oldest untouched key is the first candidate when the cache reaches capacity.
- Clicking an entry calls `get(key)`, moving that key to the MRU end of the list.
- `add entry` writes a new item. If `size === maxSize` after expired entries are pruned, the current LRU key is evicted.
- When `ttl` and `maxSize` are both configured, expired entries are removed before any valid LRU entry is evicted.
- Changing `maxSize` resets the demo so capacity, rank, and eviction behavior stay easy to compare.
### Source
#### Default.svelte
Source file: [src/lib/examples/lru-eviction/demos/Default.svelte](https://github.com/humanspeak/memory-cache/blob/main/docs/src/lib/examples/lru-eviction/demos/Default.svelte)
```svelte
size · {entries.length}/{maxSize}
lru · {lruKey}
mru · {mruKey}
accesses · {accessCounter}
evictions · {evictionLog.length}
capacity{entries.length}/{maxSize}
full cache evicts the least recently used key
= maxSize}
>
eviction log{evictionLog.length}
{#if evictionLog.length === 0}
fill the cache, then add one more item
{:else}
{#each evictionLog as log, index (`${log}-${index}`)}
{log}
{/each}
{/if}
rank
key
state
{#if entries.length === 0}
cache empty
reset to seed the LRU list
{:else}
{#each entries as entry, index (entry.key)}
{/each}
{/if}