Dart pattern matching, the idiomatic way
Apply Dart 3 switch expressions, patterns, and destructuring idiomatically — with pattern-selection rules, anti-patterns, and verification workflows
- What
- Apply Dart 3 switch expressions, patterns, and destructuring idiomatically — with pattern-selection rules, anti-patterns, and verification workflows
- Cost
- Free
- Needs
- a Dart project (Dart 3+) and the dart CLI for verification; no accounts or API keys needed.
- Install
- Copy the installer prompt below into your Muse — your agent does the rest.
Curated by Skill Harbor — an official Dart-lang guide that teaches an agent to apply Dart 3 pattern matching idiomatically. Covers a pattern-selection strategy (which pattern type for JSON validation, URI/path segments, polymorphic payloads, records, algebraic data types, numeric ranges), switch statements vs. expressions, and the full pattern syntax (logical-or/and, relational, cast, null-check, wildcard, list/map/record/object patterns). Its real value is the pragmatic boundaries: six named anti-patterns (prefer `is` promotion over `if-case`, avoid gratuitous destructuring, don't silently drop malformed data…), plus verification workflows — exhaustiveness checking via `dart analyze` and runtime Map/JSON key-semantics checks. Honest caveats: the guidance is verified against the Dart 3 analyzer of its era and may drift as the language evolves; `dart analyze` cannot statically verify dynamic Map keys, so runtime checks remain necessary. Credit to its creator. Skill Harbor never reviews the code, review it yourself before use. Discovered via skills.sh.
Version:
Install
Prerequisites: a Dart project (Dart 3+) and the dart CLI for verification; no accounts or API keys needed. Install "Dart pattern matching, the idiomatic way" for me. It's an official Dart-lang guide that teaches an agent to apply Dart 3 switch expressions, pattern matching, and destructuring idiomatically — with a pattern-selection strategy, six named anti-patterns, and exhaustiveness/runtime verification workflows. Repository: https://github.com/dart-lang/skills/blob/main/skills/dart-use-pattern-matching/SKILL.md 1. Fetch the SKILL.md file (and any helper files) from the repository path into a temporary folder and summarize what it does in one or two sentences. 2. Safety check: review the SKILL.md and scripts for anything suspicious (unexpected network calls, shell commands, credential harvesting). This repo should contain zero secrets in code, credentials only via the secure vault, allowed hosts declared in the SKILL.md. Verify that holds here; STOP on any red flag and tell me. 3. Install it as a skill: copy SKILL.md and its helper files into the agent's skills directory, in a folder named "dart-use-pattern-matching". 4. Verify with no network calls: frontmatter valid, files in place. 5. Report what was installed, where, and what I still need to do myself (e.g. save my API key in the vault). GitHub is optional: if I have a GitHub account or the gh CLI, you may use it; otherwise public access is fine. Never require it unless it's in the prerequisites above. Rules: don't touch anything outside the temp folder and the install target. If anything looks off, stop and ask me.
Questions
How do I install a build?
Every product page includes a copy-paste install prompt. Paste it into your Muse and it sets the build up for you — no manual configuration.
Where does my money go?
Straight to the seller. Skill Harbor never processes payments: checkout happens on the seller’s own page, usually Stripe.
What does the ✓ next to a creator’s name mean?
It means we confirmed the identity of the person behind the listing. It says nothing about the code itself — always check a build before installing it.