774: Promise Flow Control, Concurrency, Libraries, TypeScript and Deferreds - Part 3

This podcast episode explores the challenges and benefits of working with promises and streams in JavaScript. It discusses the usage of Promise.withResolvers() to handle streaming APIs and collect output results. The conversation also highlights the difficulties of working with streams and the desire for a custom class that extends promises to handle stream events and awaiting. Flow control techniques, such as using a for-of loop with the await keyword, are emphasized for synchronous execution. The section also delves into concurrency, throttling, and the use of packages like p-map and p-limit to handle large-scale file downloads and API requests. The benefits of concurrent mapping over chunking for function execution, the utilization of type guards in TypeScript, and the challenges of filtering arrays are also explored.