How to return many Promises and wait for them all before doing other stuff

Question

I have a loop which calls a method that does stuff asynchronously. This loop can call the method many times. After this loop, I have another loop that needs to be executed o

Answer 1

/*** Worst way ***/
for(i=0;i<10000;i++){
  let data = await axios.get(
    "https://yourwebsite.com/get_my_data/"
  )
  //do the statements and operations
  //that are dependant on data
}

//Your final statements and operations
//That will be performed when the loop ends

//=> this approach will perform very slow as all the api call
// will happen in series


/*** One of the Best way ***/

const yourAsyncFunction = async (anyParams) => {
  let data = await axios.get(
    "https://yourwebsite.com/get_my_data/"
  )
  //all you statements and operations here
  //that are dependant on data
}
var promises = []
for(i=0;i<10000;i++){
  promises.push(yourAsyncFunction(i))
}
await Promise.all(promises)
//Your final statement / operations
//that will run once the loop ends

//=> this approach will perform very fast as all the api call
// will happen in parallal