# Memory-Weighted Eviction
> Explore weighted LRU eviction in @humanspeak/memory-cache with an interactive API-response demo showing aggregate weight, recency, and multi-eviction.
**Source:** [https://memory.svelte.page/examples/memory-weighted-eviction](https://memory.svelte.page/examples/memory-weighted-eviction)
**Markdown mirror:** [https://memory.svelte.page/examples/memory-weighted-eviction.md](https://memory.svelte.page/examples/memory-weighted-eviction.md)
---
This mirror preserves the prose, implementation notes, and runnable Svelte source behind the live example page.
## FIG-001: bound aggregate weight.
Cache API-response-like records with logical KiB weights, protect entries through access, and trigger single or multiple LRU evictions from one insertion.
**Metadata:** tag: `WEIGHTED-LRU` | policy: `weighted least recently used`
### Notes
- `maxWeight` limits aggregate application-defined weight. It does not measure retained JavaScript heap automatically.
- This cache uses `maxSize: 0` so weight is its only capacity limit; the normal default remains 100 entries.
- Access calls `cache.get(key)` and moves that record to MRU. Weighted LRU removes the least recently used record, not the physically largest one.
- Select an 8 KiB record at the default limit and add it to watch one insertion evict multiple older records until the aggregate fits.
### Source
#### Default.svelte
Source file: [src/lib/examples/memory-weighted-eviction/demos/Default.svelte](https://github.com/humanspeak/memory-cache/blob/main/docs/src/lib/examples/memory-weighted-eviction/demos/Default.svelte)
```svelte
weight · {stats.weight}/{maxWeight} KiB
entries · {stats.size}
lru · {lruKey}
mru · {mruKey}
evictions · {stats.evictions}
aggregate weight{stats.weight} / {maxWeight} KiB
user-defined logical payload cost, not measured heap memory
changing the limit resets the seeded cache
onEvict log{evictionLog.length}
{#if evictionLog.length === 0}
select 8 KiB and add to trigger multi-eviction
{:else}
{#each evictionLog as log, index (`${log}-${index}`)}
{log}
{/each}
{/if}
rank
api response
weight / state
{#if entries.length === 0}
cache empty
add a response or reset the demo
{:else}
{#each entries as entry, index (entry.key)}
{/each}
{/if}