JAVASCRIPT

how to cache data in javascript

//For example when we have a function responsible for retrieving 
//and returning data we can use a strategy 
//called memoization to retrieve data from the cache 
//if it was already fetched before:

const axios = require('axios')

let fetchCount = 0

function memoize(fn) {
  const cache = {}

  return async function (key, ...args) {
    if (cache[key]) {
      return cache[key]
    }

    fetchCount++
    return (cache[key] = await fn(...args))
  }
}

const fetchDogs = memoize(function (page) {
  if (typeof page !== 'number') page = 1
  return axios
    .get(
      `https://dog.ceo/api/breeds/list/all
    `,
    )
    .then((response) => {
      return response.data.message
    })
    .catch((err) => {
      throw err
    })
})

async function start() {
  try {
    let dogs = await fetchDogs(`dogs_page_11`, 11)
    return dogs
  } catch (error) {
    const err = error instanceof Error ? error : new Error(String(error))
    console.error(`Error: ${err.message}`, err)
  }
}