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Languages & runtimes · #clojure
Stop debugging runtime NilPointerExceptions caused by malformed API payloads. Learn how to use Clojure Spec to validate data shapes and generate edge-case tests automatically.
An architecture note on using clojure.spec.alpha to validate untrusted HTTP and queue payloads at the perimeter: minimal design, operational checks, failure modes, and when to choose Malli instead.
Building large vectors with persistent `conj` can bottleneck your pipeline. Clojure transients offer fast, in-place construction that converts back to a pure, shareable data structure. This post shows the pattern, a benchmark comparison, and the trade-offs to watch.
Learn how Clojure transducers let you compose map/filter steps without allocating intermediate lazy sequences, reducing GC pressure in data pipelines.
When you need a dynamic list UI that stays in sync with your data, Reagent lets you write declarative components with minimal boilerplate. Learn how atoms, cursors, and lifecycle hooks make state management painless, see a Todo‑list example, and weigh the trade‑offs before you commit.
Learn how to validate incoming JSON with Clojure spec, coerce values, and produce clear error messages when validation fails.
Learn how transducers let you reuse the same transformation logic across sequences, channels, and reducers while avoiding intermediate collections.
When Clojure’s plain maps feel heavy, <code>defrecord</code> and <code>deftype</code> offer memory‑efficient, immutable alternatives. This guide explains when to use each, shows a concrete example, and lists common pitfalls to avoid.
Stop chasing NullPointerExceptions through your stack trace. Learn how to use Clojure Spec to validate data at boundaries and instrument functions during development.
clojurescript
react