use createMemo outside a component

is it correct to use createMemo outside a component function? Can I use it in a util file?

const getDataFromFirebase = (dataToFetch) => {
  try {
    if (firebaseDetails && Object.keys(firebaseDetails || {})?.length) {
        // some operations performed
    }
  } catch (error) {
  }
};

The above fn is in a util file. In the above fn Object.keys(firebaseDetails || {}) is a very heavy computation since firebaseDetails is very large object. I want to memoise this. Is the below implementation correct? Since I am using createMemo outside the component in a util file and getDataFromFirebase is called from many places that's why it is placed in a util file.

const memoizedFirebaseKeys = createMemo(() => Object.keys(firebaseDetails || {}));


export const getDataFromFirebase = (dataToFetch) => {
  try {
    if (firebaseDetails && memoizedFirebaseKeys().length) {
        // some heavy computation
    }
  } catch (error) {
  }
};

1 Reply

Madaxen86•5mo ago

Well there’s the cache function for server functions. Which will dedupe calls made with createAsync and also cache the results for I think 3 minutes?! Within this time the client won’t refetch the data if the cache is not revalidated client side. https://docs.solidjs.com/solid-router/reference/data-apis/cache#cache So something like this should do the trick.

export const getDataFromFirebase = cache(async (dataToFetch) => {
  "use server"
  try {
    if (firebaseDetails && memoizedFirebaseKeys().length) {
        // some heavy computation
    }
  } catch (error) {
  }
},"getDataFromFirebase");

export const getDataFromFirebase = cache(async (dataToFetch) => {
  "use server"
  try {
    if (firebaseDetails && memoizedFirebaseKeys().length) {
        // some heavy computation
    }
  } catch (error) {
  }
},"getDataFromFirebase");

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use createMemo outside a component