2018年2月4日 · The promise resolution procedure is an abstract operation taking as input a promise and a value, which we denote as [[Resolve]](promise, x). If x is a thenable, it attempts to make promise adopt the state of x, under the assumption that x behaves at least somewhat like a promise. Otherwise, it fulfills promise with the value x.

2019年12月18日 · It means you should be getting all the promises into an array and giving that to Promise.all.What you have now is neither here or there - you loop over some data, make some requests and then try to await each and yet also use Promise.all to wait for everything but never give it anything to wait for.

This states that promiseB is a promise, but it will be resolved immediately after promiseA is resolved. Another way of looking at this means that promiseA.then() returns a promise that is assigned to promiseB. // and its value will be the result of promiseA incremented by 1

2022年10月24日 · I have this typescript code where I'm hitting the POST url function with another function .But, I'm getting the promise { } instead of value while trying to fetch the response in another variable. the code snippet is below:-

2022年1月17日 · Until Node12, non-awaited promise was returning empty Promise {}, but since Node 14, it returns: Promise { undefined, [Symbol(async_id_symbol)]: 51, [Symbol(trigger_async_id_symbol)]: 5, [Symbol(destroyed)]: { destroyed: false } } I clearly see that it was changed in Node14, as it is not present on Node 12 at all.

2019年9月17日 · The problem is you are printing the result of dimension() as soon as you call it, but since this function is async, it returns a promise that is not yet resolved. You do not need to use async/await here. Settings.find() seems to return a Promise. You can just return directly this Promise and use .then() to do something once that promise is ...

2015年6月1日 · @Akrikos that answer does't let you synchronously inspect the state of a promise - For example MakeQueryablePromise(Promise.resolve(3)).isResolved is false but the promise is quite obviously resolved.

2019年2月22日 · I'm adding some functions to an Angular App and here is the thing: I'm trying to use a function that creates a promise to get data from the server, but every time I try to use it, it returns undefined. I've "debugged" with console.log printing my variable with the result of my function as value and it prints Promise{'pending'}

Bit late to the party here, but another way to do it would be to use a Deferred object. You essentially have the same amount of boilerplate, but it's handy if you want to pass them around and possibly resolve outside of their definition.

2018年10月23日 · (If Promises are returned, then the Promise.all will resolve when all such Promises have resolved.) So, you could do: const fetchAll = => Promise.all([ getPrices(), getSupply() ]); (of course, if both getPrices and getSupply return non-Promises, then there's no need for Promise.all in the first place)