Working with Multiple Promises: Racing Promises
Learn how JavaScript handles multiple promises by racing promises.
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In the examples so far, promises were used to implement a single asynchronous task. In nontrivial scenarios, we may need multiple asynchronous tasks to be executed to solve a problem.
An analogy
A currency exchange broker may want to pick the best price quote from more than one provider. A promise carries the response for a single asynchronous task, but when dealing with multiple tasks, we need to combine data from multiple asynchronous functions, each returning a promise.