# std.cache > Reflected API reference for the Sema standard-library module std.cache. > Generated by `sema doc` from `stdlib/sema/cache.sema`. Import with `from std.cache import …`. For a narrative introduction see [std.cache](/stdlib/cache/). # `cache` std.cache — memoization (design ③). `memoize` is a decorator: apply `@memoize` to any function to cache its result by (callee, arguments) for the current run, over the `memory` store. Users can write variants (TTL, namespacing) as ordinary decorators. `memoize_disk` persists across runs under `.sema/cache/` (see below). # `memoize` ```sema def memoize(fn, args) -> any !{memory.read, memory.write} ``` **Parameters** | name | type | |---|---| | `fn` | `any` | | `args` | `any` | **Returns** `any` **Effects** `!{memory.read, memory.write}` # `memoize_disk` ```sema def memoize_disk(fn, args) -> any !{fs.read, fs.write} ``` **Parameters** | name | type | |---|---| | `fn` | `any` | | `args` | `any` | **Returns** `any` **Effects** `!{fs.read, fs.write}`