Tip: To add items at the beginning of an array, use the unshift() method. What are JavaScript promises? How to make sure that a conference is not a scam when you are invited as a speaker? And instead of defining new variables from the args argument, you should be able to use spread() instead of then() for all sort of awesome work. You can check Observable represented by Rxjs, lets you return more than one value. Simply make an object and extract arguments from that object. I have a spec from a client for an implementation of a method in a module: // getGenres(): // Returns a promise. Promise.race() is a bit different although very similar to previous methods that we’ve discussed. Join Stack Overflow to learn, share knowledge, and build your career. And to be honest, it can be a bit tricky if you’re dealing with that for the first time as there are several different ways of doing that. An async function simply implies that a promise will be returned and if a promise is not returned, JavaScript will automatically wrap it in a resolved promise with the return value in that function. But it is a necessary pain I am afraid in order to avoid having anonymous functions all over the place. Javascript Promises are not difficult. As for passing context down a promise chain please refer to Bergi's excellent canonical on that. You can write an async function simply by placing the async keyword in front of the function you are creating. Promise.all takes Async operations to the next new level as it helps you to aggregate a group of promises. But why the different return value? Why does G-Major work well within a C-Minor progression? 2. fulfilled(erfüllt): heisst das die Operation erfolgreich abgeschlossen wurde. Who must be present at the Presidential Inauguration? Can promises have multiple arguments to onFulfilled? Let’s examine what techniques and methods we can use to make our lives a bit easier. It can be asynchronous or not. A promise can be either pending or fulfilled or rejected. Therefore, you can call the promise’s instance method on the return Promise. Running JavaScript Promises in parallel is as simple as calling Promise.all() ... You can modify the code to capture return values: // Serial return task1. Ein Promisekann sich in einem von drei Zuständen befinden: 1. pending(schwebend): initialer Status, weder fulfilled noch rejected. But we can return them in form of Array and Object. So in the code above all alert show the same: 1. An already resolved Promise if the iterable passed is empty. Using const is safer than using var, because a function expression is always a constant value.. You can only omit the return keyword and the curly brackets if the function is a single statement. But, we can change this behavior by handling possible rejections like so: We’re using almost exactly the same code as above, the only difference is that we’ve added map(p => p.catch(e => e)) after Promise.all() , where we’re mapping possible rejections. you can only pass one value, but it can be an array with multiples values within, as example: on the other side, you can use the destructuring expression for ES2015 to get the individual values. Is it usual to make significant geo-political statements immediately before leaving office? If you manage those individual asynchronous method calls with promises, you can create an additional promise that uses the all method. Creating a Promise. We can also leverage map to create an array of promises and use Promise.all() to deal with. Here, somethingAsync() will produce amazingData and it will be available everywhere inside the new function. In some situations, your code must make multiple asynchronous calls that require action only when they have all returned successfully. Note that it does not matter if afterSomethingElse() is doing something async or not. Example 1: This example returns the array [“GFG_1”, “GFG_2”] containing multiple values. The drawback with this technique is that it is defining a lot of functions. Check it out the Fetch API demo.. Summary. A handler, used in .then(handler) may create and return a promise. Unlike the serial execution method, we get all the values at the same time. How can I remove a specific item from an array? Usually, we only need to handle only one asynchronous operation, rarely do we encounter such circumstances that we need to use multiple promises. So this is how we create a Promise in JavaScript and use it for resolved and rejected cases. Any of the three things can happend: If the value is a promise then promise is returned. The returned Promise is resolved if all the input Promises passed to it are resolved. Promises in JavaScript are one of the powerful APIs that help us to do Async operations. How can I get query string values in JavaScript? I usually do that everytime I want to reuse some data, so it is always present as a function arg. There are two parts to understanding promises. rev 2021.1.20.38359, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, De-structuring Assignment in ES6 would help. Multi Value Observables. If you’re like me you’re working with promises on a daily basis — you’re fetching resources, maybe you’re dealing with a library that uses them or maybe you have your own little functions that need to handle asynchronous operations. How do I return the response from an asynchronous call? In some cases, you may want to check the status of the promise. Easy enough. That’s why instead of just returning the value from a promise Promise.allSettled() returns an object. But, there are some things that we need to keep in mind when using this method. Even if it is quite common in the community. I find it hard to read. We’ve added a new promise promise3 , which is being rejected after two seconds. static method (part of Promise API) which executes many promises in parallel site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Here’s a demo of chaining with Promises. As your example is running some code, I will suppose it is all declared inside a function. Arrow functions do not have their own this.They are not well suited for defining object methods.. Arrow functions are not hoisted. It will become a standard feature of next iteration of ECMAScript and is expected to be publicized in 2020. As you can see, both of these async functions return a Promise; and that Promise object resolves to the vanilla String values.. A promise will be returned, or a value wrapped into a resolved promise. And what is the risk anyway: a stack overflow? Note, Google Chrome 58 returns an already resolved promise in this case. Chaining is used much more often. Definition and Usage. you can only pass one value, but it can be an array with multiples values within, as example: function step1(){ let server = "myserver.com"; let data = "so much data, very impresive"; return Promise.resolve([server, data]); } on the other side, you can use the destructuring expression for ES2015 to get the individual values. How can I hit studs and avoid cables when installing a TV mount? ECMAScript 2015 introduced Promises into JavaScript … Since 1.8, the then() method returns a new promise that can filter the status and values of a deferred through a function, replacing the now-deprecated deferred.pipe() method. You can also use bind() or Promise.all(). But, we've already identified the first flaw in my mental model.Which is that the above two async functions are different in some way. 1. Best of all, you can rest assured that callbacks are guaranteed to run in the order they were passed in. Note: The new item(s) will be added at the end of the array. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This Promise resolves the value parameter. This is really cool and we could use this technique in a variety of scenarios, for example processing responses of multiple requests to the server. An asynchronously resolved Promise if the iterable passed contains no promises. To learn more, see our tips on writing great answers. What is the current school of thought concerning accuracy of numeric conversions of measurements? One of the significant differences between Observables and Promises is Observables support the ability to emit multiple asynchronous values. We have seen how Observables are very similar to Promises, but what is different between the two? You can leverage Promise.race() and provide both the request/computation and a separate promise that rejects the promise after 5 seconds. And most of the time they will call another function defined elsewhere - so reusable - to do the job. The successively calling methods in … It also takes an iterable and returns a promise that resolves after all of the given promises either have resolved or rejected, with an array of objects which describe the outcome of each promise. Of all the resources I think they provide the most concise details. Your mom promises you that she’ll get you a new phone next week.” How is the seniority of Senators decided when most factors are tied? The closest you can get is use Q.spread and return arrays or use ES6 destructuring if it's supported or you're willing to use a transpilation tool like BabelJS. Let’s talk about Promise.allSettled() . In other words, I can say that it helps you to do concurrent operations (sometimes for free). Some believe Promise.all() is the solution to all problems, so it deserves to be mentioned I guess. For all signatures, the arguments can be set to null if you don't want to assign a handler for that event type. In your post you mentionned the use of spread(). It accepts an iterable object (e.g. Promise.all() takes an iterable (such as Array) and returns a single promise that resolves when all of the promises have resolved. Whatever you return from a promise will be wrapped into a promise to be unwrapped at the next .then() stage. How do I check if an array includes a value in JavaScript? One thing that I should mention is that I don’t recommend using async/await with forEach, as it’s not promise-aware, it won’t wait for execution to end and will just jump unto the next iteration. That would look like writing return Promise.resolve(‘hello’). A Promise object is widely used in Javascript async programming. Promise.all() has a fail-fast behavior. This is happening at the bottom of handle(), The handler object carries around both an onResolved callback as well as a reference to resolve().There is more than one copy of resolve() floating around, each promise gets their own copy of this function, and a closure for it to run within. However, lots of people find it a little bit hard to understand at the beginning. As a rule of thumb, for JavaScript I always read documentation from MDN Web Docs. I even do that for functions with only 1 parameter, so I do not need to get the function in and out when I add/remove a parameter to the function signature. They must be defined before they are used.. Asking for help, clarification, or responding to other answers. Let's take a look at the following example: This returned promise is then resolved/rejected asynchronously (as soon as the stack is empty) when all the promises in the given iterable have resolved, or if any of the promises reject. Here we’re creating promises on the fly with a helper function createPromise , mapping them into an array called greetingPromises and awaiting inside to manipulate the data from the promise. A JavaScript Promise represents the result of an operation that hasn't been completed yet, but will at some undetermined point in the future. 3. here your nesting then blocks instead of callback functions, this would defeat the very purpose of having promises. The promise is resolved with the given value, or the promise passed as the value if the value was a promise object. Introduction to the JavaScript promise chaining The instance method of the Promise object such as then (), catch (), or finally () returns a separate promise object. 3. rejected(zurück gewiesen): heisst das die Operation gescheitert ist. It doesn’t matter if the other promises would have resolved successfully and in what order the actions happened, one reject is all that it takes. If the value has a “then” attached to the promise, then the returned promise will follow that “then” to till the final state. To get the actual data, you call one of the methods of the Response object e.g., text() or json().These methods resolve into the actual data. This works the same with rejections: Almost identical example as above, but now we’re rejecting instead of resolving the first promise. (joke!). If you want to keep your functions reusable but do not really need to keep what is inside the then very short, you can use bind(). then (result3 => [result1, result2, result3]))). Wrap Up. This one in a way is the answer proposed by Kevin Reid. Can Pluto be seen with the naked eye from Neptune when Pluto and Neptune are closest? 8 JavaScript String Methods as Simple as Possible, D3 and React — A Design Pattern for Responsive Charts, Best Practices for building Angular Schematics. Here we consider afterSomething() and afterSomethingElse() are not going to be reused anywhere else. But I'm wondering if there is a way to have afterSomethingElse accept 2 parameters and invoke it likewise, as that seems a lot easier to document and understand. How to get the value from the GET parameters? Photo by Andrew Seaman on Unsplash. Promise.all takes an array of promises (it technically can be any iterable, but is usually an array) and returns a new promise.. Podcast 305: What does it mean to be a “senior” software engineer, Array destructuring returned from promises not working as expected, Keep getting an undefined result from new Promise, Make multiple asynchronous fetch requests and find out which request includes a string match, How to define variable which has scope for a request and it is destroyed after the request is done. A promise inherently resolves with a single value - this is part of how Q works, how the Promises/A+ spec works and how the abstraction works. If that’s important for your use case for...of loop is a great way to go. Active 6 months ago. Promises.race is a function that takes an array of Promises and returns a new Promise. All .then on the same promise get the same result – the result of that promise. It can also be the Promise or a thenable to resolve. Das Promise-Objekt (dt./deutsch Ein Versprechens-Objekt, das später eingelöst wird)wird für asynchrone Berechnungen verwendet. How were four wires replaced with two wires in early telephone? It’s really important to note that there is no ordering in execution of the given promises — in some computers they may be executed in parallel, but on others they may be executed serially. A function cannot return multiple values. Example when both of the promises are resolved: We provide two promises, promise1 and promise2 — promise1 resolves after 2 seconds and promise2 resolves after 3 seconds, so naturally only see “First promise” logged out, since it was resolved first. How do I access previous promise results in a .then() chain? Promises are a broader topic, and there are many more things to learn about them. This Promise‘s value is equal to that of the first Promise that resolves or rejects. Note that they will still require you to split your code. Do not focus too much on the Promise.resolve(). Promise.allSettled() is really similar to Promise.all() . Chaining multiple Promises. Your coding style is quite close to what I use to do, that is why I answered even after 2 years. I will call it toto(). If you don’t get the expected result you know that the task didn’t resolve in a timely fashion: Remember how we’ve talked about Promise.all() and how it doesn’t respect the order of execution? Example: Again we’re using the same example as above, the only different is that we’ve replaced Promise.all() with Promise.allSettled(). If we need to keep track of multiple values we can return several values as an array, … When we fetch data from some source, for example an API, there is no way for us to absolutely determine when the response will be received. Promise.resolve(value); Parameters. So if the promise gets rejected, it will jump to the catch( ) method and this time we will see a different message on the console. Topic: JavaScript / jQuery Prev|Next. About Us Learn more about Stack Overflow the company ... How do I make a JavaScript promise return something other than a promise? Well, for us to understand whether the provided promise was rejected or resolved a simple value is usually not enough. In practice we rarely need multiple handlers for one promise. I've recently run into a certain situation a couple of times, which I didn't know how to solve properly. In order to return multiple values from a function, we can not directly return them. A Promise in short: “Imagine you are a kid. Let’s look at an example: It’s really similar to what we’ve looked at previously. TypeScript promise holds the future value either it will return success or gets rejected. The Promise.all() method can be used to check whether all Promises have fulfilled successfully. Let us take a simple example. Ask Question Asked 5 years, 9 months ago. Thanks for contributing an answer to Stack Overflow! Creation of promises and Handling of promises. In this blog post, I've attempted to describe a use case when a developer needs to use a returned value from a Promise object somewhere later in code. Some old good sequential code would make it. A pending Promise in all other cases. If processAsync() is asynchronous, the code will look slightly different. A promise represents the eventual result of an asynchronous operation. why does wolframscript start an instance of Mathematica frontend? The new promise resolves when all listed promises are settled, and the array of their results becomes its result. A promise conceptually represents a value over time so while you can represent composite values you can't put multiple values in a promise. It’s also possible to manipulate the return data if you want! It receives the return value of the first promise. You can see in the example below, how to define Promise, declare Promise with new operator instance and pass resolve and reject parameter within the inner function in the Promise object. If it is not, then the result value will be returned. Example. then (result1 => task2. Viewed 235k times 57. But because the function is called from a then(), the value will be wrapped into a promise anyway (at least in raw Javascript). The sum of two well-ordered subsets is well-ordered, Can I buy a timeshare off ebay for $1 then deed it back to the timeshare company and go on a vacation for $1, Why are two 555 timers in separate sub-circuits cross-talking? Promises in JavaScript. How do you properly return multiple values from a Promise? It also takes in an iterable as an argument and returns a promise that either resolves or rejects as soon as one of the promises are either resolved or rejected. I am not a big fan of having anonymous functions everywhere. Same as before for afterSomethingElse(). Assuming that you have a basic understanding about JavaScript Promises, I'll start by creating a method which returns a Promise, so that you can see how to return data from promise. Use the fetch() method to return a promise that resolves into a Response object. an array) of multiple Promises and returns a Promise. I’m pretty sure you can find a polyfill if you want to (although it’s reasonably easy to it write yourself, since we know how it works). ECMAScript 2015 introduced Promises into JavaScript world — the days of callback hell were over. Thanks for reading, I hope you’ve learnt something new! For instance, the Promise.all below settles after 3 seconds, and then its result is an array [1, 2, 3]: your coworkers to find and share information. The static Promise.resolve() function returns the Promise that is resolved. You can't resolve a promise with multiple properties just like you can't return multiple values from a function. Returning promises. Now what this new function will look like typically depends on is processAsync() also asynchronous? Let's look at creating a promise. What value does the second promise resolve to? Assume the following code: Now a situation might arise where I would want to have access to amazingData in afterSomethingElse. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. You can pass data to Promise.all() - note the presence of the array - as long as promises, but make sure none of the promises fail otherwise it will stop processing. Note: This method changes the length of the array. How do you get a timestamp in JavaScript? You can also return another Promise. We don’t need to catch possible errors anymore and the returned value has now become an array of objects with possible values of: By using status we can explicitly tell whether the promise has been rejected or resolved. And it's sometimes confusing for developers how to use it properly. promise states and fates. However, you can get the similar results by returning an array containing multiple values. (Poltergeist in the Breadboard). No reason to overcomplicate things if processAsync() is not asynchronous. The push() method adds new items to the end of an array, and returns the new length. An example of such an operation is a network request. Answer: Return an Array of Values. Is it kidnapping if I steal a car that happens to have a baby in it? How do I remove a property from a JavaScript object? We’re iterating over three promises, awaiting for the result and logging the message out. As you can see start and finish messages are logged out first, even though we’re waiting for inside the forEach loop for the message. The behavior of Promise.all() seems to contradict this. then (result2 => task3. You will also notice I added a return statement as it is usually the way to go with Promises - you always return a promise so we can keep chaining if required. 6 min read. Stack Overflow for Teams is a private, secure spot for you and It becomes interesting when you need to return one or more promise(s) alongside one or more synchronous value(s) such as; In these cases it would be essential to use Promise.all() to get p1 and p2 promises unwrapped at the next .then() stage such as. The Fetch API allows you to asynchronously request for a resource. 2. How can I request an ISP to disclose their customer's identity? In it's new ECMA 6 version, JavaScript allows you to create a new type of object called a Promise. They will only be defined locally anyway. In simple words, it’s Promise.all() without fail-fast behavior and also a bit different return value. Unfortunately we can’t simply use Promise.allSettled() in production as of right now, as it’s currently in stage 4 draft mode. One obvious solution would be to return an array or a hash from afterSomething, because, well, you can only return one value from a function. As for real world scenarios imagine you have a request/computation that might take really long time to resolve and you want to wait maximum of 5 seconds. check. It means that if one of the promises is rejected then the promise returned from Promise.all() is rejected as well. Then we will have another function which will run both afterSomething() and afterSomethingElse(). I'm only wondering about this possibility since there is Q.spread, which does something similar to what I want. javascript promise not passing all arguments (using Q). Locked myself out after enabling misconfigured Google Authenticator. Keeping that in mind we can see how this method can be helpful, for example, if we need to fetch data from different points and they’re not dependent on each other (that means that we’re not interested in the sequence of execution) we can use Promise.all() to do that. You could also use a basic for loop, but I like for…of more because it looks a bit cleaner. It is as we replaced the callback-hell by a promise-purgatory. What language(s) implements function return value by assigning to the function name. Making statements based on opinion; back them up with references or personal experience. Because both functions will be using amazingData, it makes sense to have them in a dedicated function. Another method worth mentioning is Promises.race. Using arrays or objects as defined in other answers would work too. Run this code in the terminal. How to Return Multiple Values from a Function in JavaScript. To keep it simple, bind() will prepend the list of args (except the first one) to the function when it is called. The primary way of interacting with a promise is through its then method, which registers callbacks to receive either a promise’s eventual value or the reason why the promise cannot be fulfilled. It’s also worth mentioning that there are already some browsers that are supporting it. Let’s see it in action: We created two promises: promise1 resolves immediately with a string of “Hello” and promise2 resolves after a second with the string of “World”. As you can see as soon as we’re hitting reject Promise.all() will also reject immediately. I read up the Promises page form MDSN Web Docs and played around with code to get a hang of it. And soon you could see promises almost in every new code base all the values at same! Order they were passed in suited for defining object methods.. arrow functions are not well suited for object... Example is running some code, I hope you ’ ve looked at previously returned. Cases, you can write an async function simply by placing the keyword... Clicking “ post your answer ”, “ GFG_2 ” ] containing multiple.! A little bit hard to understand at the beginning chaining with promises return promise there! Without fail-fast behavior and also a bit different although very similar to previous methods that need! To all problems, so it deserves to be unwrapped at the next.then (.. Of ecmascript and is expected to be reused anywhere else result3 = > [ result1,,. Current school of thought concerning accuracy of numeric conversions of measurements it resolves down a promise all! Bit different return value of the promises page form MDSN Web Docs invited as a rule of thumb for. World — the days of callback functions, this would defeat the very purpose having... “ post your answer ”, you can represent composite values you ca n't a. Cc by-sa are supporting it of these async functions return a promise is! Not hoisted object is widely used in JavaScript async programming erfolgreich abgeschlossen wurde you... Asked 5 years, 9 months ago extract arguments from that object the arguments be! Using Q ) resolves to the vanilla String values in JavaScript are of... Whatever you return more than one value all over the place instead of just the. Hell were over not well suited for defining object methods.. arrow functions are not well suited for defining methods. Where I would like to write down the way I understand promises, but what is the explicit promise antipattern. At previously paste this URL into your RSS reader over time so while you can also leverage to. New items to the vanilla String values Neptune when Pluto and Neptune are closest descriptive... Reason to overcomplicate things if processAsync ( ) function returns the promise all listed promises are fulfilled ( resolved rejected... Results by returning an array ) of multiple promises and returns the promise ’ a. Decided when most factors are tied being rejected after two seconds usually enough. Access to amazingData in afterSomethingElse for Teams is a network request to request. Access previous promise results in a way is the seniority of Senators decided when most factors tied... Then we will have another function which will run both afterSomething ( ) understand whether the provided was. S value is javascript promise return multiple values to that of the array [ “ GFG_1 ” “... Avoid cables when installing a TV mount das die Operation erfolgreich abgeschlossen wurde our tips writing... Simple way to go call another function which will run both afterSomething ( ), result3 ] )... Use Promise.all ( ) is asynchronous, the arguments can be either pending or or. Both values — there 's nothing wrong with resolving with an object and extract arguments that. Properly return multiple values out of a resolve Status of the promises page form MDSN Web Docs of the... By placing the async keyword in front of the three things can happend: the. Is as we ’ re iterating over three promises, in a.then ( ) function returns promise... Results in a dummy way some believe Promise.all ( ) is doing something async or.!, and returns a promise ; and that promise: 1. pending ( schwebend ): heisst das Operation! On opinion ; back them up with references or personal experience defeat the purpose. Believe Promise.all ( ) is not, then the result and logging the message out two wires early... Subscribe to this RSS feed, copy and paste this URL into your RSS reader not... Construction antipattern and how do you properly return multiple values from a promise that resolves rejects... Return an object I get query String values in JavaScript async programming RSS! Handlers for one promise [ result1, result2, result3 ] ) ) promise was rejected or resolved simple... Can return them in a promise ; and that promise JavaScript world — the days callback... Of chaining with promises fan of having promises then short the next (. I remove a property from a JavaScript object, clarification, or the promise returned. Directly return them in a promise as the value from the get parameters do async operations I... Put multiple values from a promise object knowledge, and the array of and... Can represent composite values you ca n't return multiple values action only when they all. The iterable passed contains no promises then blocks instead of just returning the if. The way I understand promises, in a dummy way result value will be wrapped a... Erfüllt ): initialer Status, weder fulfilled noch rejected since there is Q.spread, which I did n't how... Construction antipattern and how do I return the Response from an array of promises – the of... Fetch ( ) post you mentionned the use of spread ( ) method to a. Tip: to add items at the next new level as it helps you to split code! And cookie policy can represent composite values you ca n't put multiple.... Do n't want to reuse some data, so it deserves to be publicized in 2020 in front the! Resolves to the function name Fetch ( ) simple matter of calling new on promise ( the that! Added a new type javascript promise return multiple values object called a promise object is widely in! Even after 2 years this method the length of the function name returned from Promise.all ( and! Bit hard to understand whether the provided promise was rejected or resolved a simple way go! Async programming certain situation a couple of times, which does something similar to what I use make. Like to keep in mind when using this method your coding style is quite common in community! There are some things that we need to keep in mind when using this method iteration... Re iterating over three promises, you can call the promise or a over! All returned successfully array, and returns the new item ( s ) will also reject immediately Exchange Inc user. Be set to null if you do n't want to have a baby in it sometimes... Than a promise represents the eventual result of that promise object, this! Async functions return a promise then promise is returned resolved or rejected ) with a more name. Rarely need multiple handlers for one promise your RSS reader from the parameters... Out of a resolve they were passed in when most factors are tied request/computation a! The job functions will be returned and the array of promises async programming afterSomething )! Use it properly Promise.resolve ( ) also asynchronous asynchronously resolved promise arguments ( using Q ) for signatures! Defining a lot of functions what I use to do the job thought concerning accuracy of numeric of. 'S look at an example: it ’ s also possible to manipulate return. To our terms of service, privacy policy and cookie policy of it returned. Set to null if you do n't want to have access to amazingData afterSomethingElse! Of loop is a great way to go to make significant geo-political statements immediately before leaving office the... A hang of it, a promise will be returned and the array of promises and use.... ; and that promise an asynchronously resolved promise Pluto be seen with the eye... The value from the get parameters read documentation from MDN Web Docs and played around with code to get value... Be available everywhere inside the new promise ( resolved or rejected ) with more! Function that takes an array of their results becomes its result static Promise.resolve )... Can say that it helps you to split your code must make multiple asynchronous.... Run after it resolves of a resolve cables when installing a TV mount require action only when they all. Return from a promise can be either pending or fulfilled or rejected ) with a value... After 5 seconds then blocks instead of callback functions, this would defeat the purpose! Over time so while you can also be the promise is resolved with the given value, or a wrapped. I think they provide the most concise details reusable - to do concurrent operations sometimes! Status of the first promise using, but here is how you should be to! It receives the return data if you do n't want to assign a handler, used in and. When all listed promises are fulfilled ( resolved or rejected ) with a more descriptive name are.! But here is how you should be able to use it for resolved and rejected cases a bit return! Example returns the new item ( s ) will also reject immediately s instance on... S look at a better way to create an javascript promise return multiple values can not directly return them a. Return an object responding to other answers and that promise days of callback functions this. Even after 2 years get multiple values are closest functions everywhere bit cleaner are things... Create an additional promise that resolves into a Response object anonymous functions everywhere there. Multiple asynchronous calls that require action only when they have all returned successfully is Q.spread, which does something to...

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