Promise is synchronous or asynchronous in node js

Question

I have lot of confusion in promise. It\'s a synchronous or asynchronous ?

return new Promise (function(resolved,reject){
    //sync or async? 
});
         


        

Answer 1

When you create a promise and pass a call back to it that callback is gonna executed immediately (sync)

const promise= new Promise(function(resolve, reject) {
      //doing some logic it gonna be executed synchronously
       console.log("result");
    })
    console.log("global log")
    

But when you resolve it by .then() method it will act in asynchronous way so for example :

const promise = new Promise(function(resolve, reject) {
  //doing some logic it gonna be executed synchronously

  resolve("fullfiled")
})
promise.then(v => {
  console.log(v)
})
console.log("global log")