Question 1

Orchestra vs clojure.spec.test.alpha: what's the difference?

Accepted Answer

Orchestra validates :ret and :fn specs in addition to :args, while clojure.spec.test.alpha only checks :args. It's a drop-in replacement that provides more comprehensive instrumentation without code changes.

Question 2

How to use Orchestra with ClojureScript?

Accepted Answer

In ClojureScript, require orchestra-cljs.spec.test and use defn-spec with refer-macros. Ensure ClojureScript version is at least 1.10.597, as specified in the README dependencies.

Question 3

Does Orchestra slow down my application?

Accepted Answer

Yes, Orchestra adds runtime overhead by validating all specs on each function call. This is fine for development and testing but may impact performance in production.

Question 4

How to handle multi-arity functions in defn-spec?

Accepted Answer

defn-spec automatically generates specs for multiple arities, but for :fn validation, you must handle the arity tag in args, as shown in the README example with case or by ignoring it.

Question 5

Can I use Orchestra in production?

Accepted Answer

It's not recommended due to performance overhead. Orchestra is designed for development and testing to catch errors early; for production, consider selective instrumentation or disabling it.

Question 6

Does Orchestra work with existing clojure.spec definitions?

Accepted Answer

Yes, Orchestra is compatible with existing specs. After instrumenting, it validates all specs without modification, making integration straightforward.

Orchestra

What is Orchestra?

Overview

Use Cases

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Pros & Cons

Pros

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Frequently Asked Questions