memoization-2.js

const memoized = new Map()

function compute(... args) {
  const key = #[...args] // magic is here
  if (memoized.has(key)) 
  { 
    return memoized.get(key)
  }
  else {
    const value = carrySlowComputation(...args)
    memoized[key] = value
    return value
  }
}