Usage

const memoize = require('level-memoize')('./levelDB_location')

function returnsPromise(x){
  return Promise.resolve(x*2)
}

const cachedFunction = memoize(returnsPromise)

cachedFunction(2).then(console.log) // promise returns 4
cachedFunction(6).then(console.log) // promise returns 12
cachedFunction(2).then(console.log) // cache returns 4

Potential improvements

• Expiry for cached results
• Manual clear of cache