How to use promises in javascript ? Basic Promise in Javascript

Question

I am using redux. I want to perform a certain network call after updating store. I wrote promise for this as -

let promise=new Promise(function(resolve,reject){
updateStore() //separate method which updates the store.
}).then(()=>{    
 //Netowrk call
 //axios code
});

I am getting a syntax error here : Declaration or statement expected.

What should be the way of performing this activity?

Answer 1

You Can but not sure why you would want to use promise here? What are we waiting on?

function updateStore() {
   console.log("updating");
}

let promise=new Promise(function(resolve,reject){
  console.log('update')
  resolve( updateStore() ) //separate method which updates the store.
}).then(()=>{
  console.log('now network')    
 //Netowrk call
 //axios code
});

Using promise

Might be better served just to use a function.

function update_store(callback) {
   console.log("update store");
   callback(); /* or setTimeout( callback ); */
}

function now_network() {
   console.log("update network");
}

update_store(now_network);

Using callback