There are two packages (apart from Express) used:
It’s a bit contrived but we just want to demonstrate using the results of one API call to populate a second when all of them are asynch. In our example we’ll grab weather for 3 cities, pick the hottest one, then hit GitHub with a search for repos that have that city’s name. to search GitHub repos for the ‘hottest’ city. The file discussed here is intended to be mounted on a route in a Node/Express application: //From app.jsĬonst rp = require( './routes/request-promises') This isn’t a discussion of ES6 Promises per se, but it might help you get to the point of understanding them. In this article we’ll use both by using ES6 native Promises and the async.js package. There are multiple approaches to this problem, but most rely on Javascript Promises, either from a third-party library in ES5 and earlier or ES6’s built-in Promises. The pattern is to look something up that returns a collection, and then look something else up for each of the members in the collection. I see this quite a bit in my software engineering course where teams are required to synthesize new information from two distinct third-party data sources.
COMPOSE EXPRESS RIP 9 HOW TO
One of the toughest things to get your head around in Javascript is how to handle nested asynchronous calls, especially when a function depends on the result of a preceding one. Composing the results of nested asynchronous calls in Javascript