The word “async” before a function means one simple thing: a function always returns a promise.
Often considered complex our async functions can be simple also, for instance, this function returns a resolved promise with the result of 1; let’s test it:
async function f1() {
return 1;
}
f1().then(alert);
In above method, first f1() function is called, then f1() returns value 1, as 1 is not an error so it is passed to the resolve method ie. alert
In next method we will try console.log method.
async function f1() {
return 1;
}
f1().then(console.log);
//output will be 1 as "1" is passed to the console.log() method
In next example we will pass nothing in the console.log() method to see whther the value “1” was actually passed or not.
async function f1() {
return 1;
}
f1().then(console.log());
//output is blank as nothing is passed to the console.log() method
