Question 1

How to limit concurrency when fetching multiple APIs in JavaScript?

Accepted Answer

Use p-map with a concurrency option, as shown in the FAQ example, where it maps over URLs with a limit of 5 concurrent fetches. This ensures promises are created lazily to control execution.

Question 2

What's the difference between p-map and p-all for batch processing?

Accepted Answer

p-map is for mapping over an array with a single function, while p-all runs different promise-returning functions concurrently. The FAQ explains p-map is better for uniform operations, and p-all for varied functions.

Question 3

How to implement exponential backoff with p-retry?

Accepted Answer

p-retry supports configurable retries with options like retries and factor for backoff. You can pass an async function, and it will retry on failure with increasing delays, making it ideal for unreliable operations.

Question 4

Is promise-fun compatible with TypeScript?

Accepted Answer

Yes, most packages include TypeScript definitions, as seen in their individual GitHub repositories. This provides type safety for async operations, though you may need to install types separately for some utilities.

Question 5

Can I cancel a promise after it's started with p-cancelable?

Accepted Answer

Yes, p-cancelable allows creating cancelable promises, but it requires manual setup and handling, which can add complexity compared to built-in AbortController in modern JavaScript for some use cases.

Question 6

promise-fun vs async.js: which is better for async control flow?

Accepted Answer

promise-fun is more modern and promise-native, with smaller, focused modules, while async.js is callback-based but supports promises. Choose promise-fun for pure promise/async workflows and async.js for legacy compatibility or broader utility sets.

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