I have code like this.

async function doAsync(count){
  //external function I need to use
  count  ;
  console.log("async count is "  count );
  return await count;
}
 
function makeSyncChain(i){
  //my chain that I could change
  i=doAsync(i);
  return i;
}

let val=0;
console.log("sync count is "   makeSyncChain(val));

so like at the example, I have sync chain and one of the chain function is async, is there a way to make async function working in sync chain?

CodePudding user response：

Correct solution must be:

async function doAsync(count){
  //external function I need to use
  count  ;
  console.log("async count is "  count );
  return await count;
}

let val=0;
console.log("sync count is "   (await doAsync(val)));

But in wrong key may be written as (and yes it won't work, it will just hang the browser):

async function doAsync(count){
  //external function I need to use
  count  ;
  console.log("async count is "  count );
  return await count;
}
 
function makeSyncChain(i){
  //my chain that I could change
  let isDone = false;
  let result;
  doAsync(i).then(r => {
    result = r;
  }).finally(() => {
    isDone = true;
  });
  while (!isDone);
  return result;
}

let val=0;
console.log("sync count is "   makeSyncChain(val));