Delay the evaluation of a variadic async function and cache the result
npm install thunky-with-argsLike thunky but:
Delay the evaluation of a ~~paramless~~ variadic async function and cache the result.
``js
const dns = require('dns')
const memoize = require('thunky-with-args')
const lookup = memoize(function (hostname, opts, callback) {
if (typeof opts === 'function') {
callback = opts
opts = null
}
console.log('lookup', hostname, opts)
dns.lookup(hostname, opts, callback)
})
lookup('localhost', console.log)
lookup('localhost', console.log)
lookup('localhost', console.log)
lookup('localhost', { family: 6 }, console.log)
lookup('localhost', { family: 6 }, console.log)
`
This results in two lookups, the other calls are cached:
`
lookup localhost null
lookup localhost { family: 6 }
null '127.0.0.1' 4
null '127.0.0.1' 4
null '127.0.0.1' 4
null '::1' 6
null '::1' 6
Returns a function thunk that caches the result of work(..) unless it returned an error. Optionally provide a stringify function that converts an array of arguments to a cache key. Defaults to sigmund which works well for primitives, arrays and plain objects but takes a few shortcuts to be fast.
With npm do:
`
npm install thunky-with-args
MIT © Vincent Weevers