Multiple return values from multiple promises
Let’s assume we want to retrieve some data from an API and show it together with the original data. For instance, I’ll use the DuckDuckGo API to find capital names for countries.
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Programming paradigms in JavaScript – callbacks, Promise, async/await, promisify, functional Ramda and reactive RxJS
As a quick exercise, I wanted to read all URLs from my page’s sitemap instead of crawling the site. Just after I added a nested callback I decided to apply the Single Responsibility Principle and convert calls to Promises. Later I experimented with async/await and automatic conversion with Node’s promisify. Finally, I rewrote the solution in functional style using Ramda and reactive using RxJS. Read on to follow the evolution of callbacks in JavaScript.
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