Memoizing async functions with cache eviction on reject
Copyright (c) 2023–2025 Check Digit, LLC
@checkdigit/memoize memoizes async functions, with cache eviction on reject.
The resulting promise is cached, guaranteeing the underlying function is called at most once for a given set of
arguments, unless the promise ultimately rejects.
If the promise is rejected, it will be removed from the memoize cache.
This allows the function to be retried.
``shell`
$ npm install @checkdigit/memoize
`ts
import memoize from '@checkdigit/memoize';
async function doIt(parameter: number): Promise
console.log('doing it', parameter); // doing it 123, doing it 456 (note parameter=123 only executed once)
return parameter * 2;
}
const memoizedDoIt = memoize(doIt);
const value1 = await memoizedDoIt(123);
const value2 = await memoizedDoIt(456);
const value3 = await memoizedDoIt(123); // uses cached result
console.log('the results were', value1, value2, value3); // the results were 246 912 246
``
MIT