Question 1

How to set up A/B testing with Touchstone in a Clojure web app?

Accepted Answer

Add the Ring middleware for test subject IDs, then use mab-select to serve variations in your handlers and mab-commit! to record conversion events. The README provides a clear example for optimizing sign-up buttons.

Question 2

Touchstone vs Split for Clojure A/B testing?

Accepted Answer

Touchstone is a lightweight library with automatic multi-armed bandit optimization and Redis backend, ideal for low-maintenance server-side testing. Split is a more feature-rich service with a dashboard and client-side SDKs, better for teams wanting managed solutions and real-time analytics.

Question 3

Does Touchstone support ClojureScript for browser testing?

Accepted Answer

Primarily designed for server-side testing with Ring, the library lacks documented guidance for modern Cljs apps, as noted in the README. Client-side use may require custom adaptation or waiting for future updates.

Question 4

How to handle multivariate testing with Touchstone?

Accepted Answer

Use the mab-select function with multiple test IDs and variations, leveraging its advanced capabilities for complex scenarios. The API docs detail test composition and dependent tests for multivariate setups.

Question 5

What are the performance implications of using Redis with Touchstone?

Accepted Answer

Redis ensures high performance and efficient data handling for high-traffic sites, but it introduces network latency and requires proper scaling. Carmine, the Redis client, is optimized for Clojure to minimize overhead.

Question 6

Can I use Touchstone without the Ring middleware?

Accepted Answer

Yes, by manually setting the *ts-id* dynamic var to manage test subject IDs, but the middleware simplifies this process for web applications, reducing boilerplate code.

Touchstone

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