Usecase for function style in defineStore

Author: trchopan

packages/docs/cookbook/create-store-dynamically.md

@@ -0,0 +1,46 @@
+# Create Store Dynamically
+
+Store can be created dynamically using factory pattern. Which will greatly help reduce boilerplate and structure your application.
+
+## Example
+
+An usecase of multiple tables that require pagination and filter. And all need to have separate stores to keep track of the result and pagings.
+
+We can have a creator function like this
+
+```js
+export const createPagingStore = (endpoint) => {
+  const currentPage = ref(0)
+  const totalPage = ref(0)
+  const tableContent = ref()
+  const fetchData = async (page) => {
+    const data = await api.get(`https://example.com/${endpoint}?page=${page}`)
+    currentPage.value = page
+    totalPage.value = data.totalPage
+    tableContent = data.content
+  }
+
+  return {currentPage, totalPage, tableContent, fetchData}
+}
+```
+
+Inside the `defineStore` option function you will have access to all the state and actions, and extra logic as needed.
+
+```js
+
+export const usePagingWeather = defineStore('pagingWeather, () => {
+  const pagingStore = createPagingStore('weather')
+  
+  // Extra logics for this store
+  const sundays = computed(() => {
+    return pagingStore.tableContent.days.filter(day === 'sunday')
+  })
+
+  return {
+    ...pagingStore,
+    sundays,
+  }
+})
+```
+
+Don't worry about the same `ref`'s inside multiple store to be the same. They are handled by `pinia` as separate states in the stores.

packages/docs/cookbook/index.md

@@ -4,5 +4,6 @@
 - [HMR](./hot-module-replacement.md): How to activate hot module replacement and improve the developer experience.
 - [Testing Stores (WIP)](./testing.md): How to unit test Stores and mock them in component unit tests.
 - [Composing Stores](./composing-stores.md): How to cross use multiple stores. e.g. using the user store in the cart store.
+- [Create Store Dynamically](./create-store-dynamically.md): An advance usecase for creating store.
 - [Options API](./options-api.md): How to use Pinia without the composition API, outside of `setup()`.
 - [Migrating from 0.0.7](./migration-0-0-7.md): A migration guide with more examples than the changelog.