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Languages & runtimes · #ceylon
Discover how Ceylon’s strong static typing and nullable type markers eliminate NullPointerExceptions at compile time. Learn with a hands‑on example, trade‑offs, and how to get started.
Ceylon forces API opt-in with the shared modifier and separates compile-time import from implementation use in module.ceylon, letting you keep a module surface small and auditable.
Use Ceylon’s union/intersection types and null‑safe optionals to build a small, JVM‑friendly domain model. This guide maps requirements to a minimal design, defines interop boundaries, and lists operational checks and failure modes.
Learn how Ceylon’s union types and match expressions let you handle Java nulls safely at compile time, reducing runtime surprises when calling existing Java libraries.
A diagnostic guide for Ceylon programs where a nullable union type (String?) slips past apparent null checks: how flow-based narrowing fails, how to find the break, and which fix matches each cause.
Discover how Ceylon’s union and intersection types let you design APIs that return success or error values, model multi‑interface objects, and keep type safety intact at runtime. A concrete example shows the compiler’s handling and the trade‑offs you need to weigh.
Learn when to expose Ceylon declarations with shared visibility and when to keep them package‑private, with a decision table, trade‑off discussion, and a minimal validation example.
A diagnostic guide to Ceylon 1.3.3 module resolution failures: repository order, version range conflicts, stale caches, invalid .car archives, and Java interop native imports.
Learn how Ceylon’s value types let you create lightweight, immutable objects that save memory and improve performance, with a concrete example and a clear look at the trade‑offs you’ll face.