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Assertion patterns reference — guard clauses, preconditions, invariants, and contract programming. Use when writing defensive code, validating inputs, or implementing design-by-contract.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/bytesagain/ai-skills --skill assert命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
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| name | assert |
| version | 1.0.0 |
| description | Assertion patterns reference — guard clauses, preconditions, invariants, and contract programming. Use when writing defensive code, validating inputs, or implementing design-by-contract. |
| author | BytesAgain |
| homepage | https://bytesagain.com |
| source | https://github.com/bytesagain/ai-skills |
| tags | ["assert","assertion","precondition","invariant","contract","defensive","testing"] |
| category | devtools |
Quick-reference skill for assertion techniques, design-by-contract, and defensive programming patterns.
introscripts/script.sh intro
Overview of assertions — purpose, philosophy, and when to use them vs exceptions.
preconditionsscripts/script.sh preconditions
Precondition patterns: validating inputs, guard clauses, and fail-fast design.
postconditionsscripts/script.sh postconditions
Postcondition patterns: validating outputs and return value contracts.
invariantsscripts/script.sh invariants
Class and loop invariants — maintaining consistent state throughout execution.
languagesscripts/script.sh languages
Assertion syntax and behavior in Python, Java, C, JavaScript, Rust, Go.
contractsscripts/script.sh contracts
Design-by-contract methodology — Bertrand Meyer's approach and modern implementations.
antipatternsscripts/script.sh antipatterns
Common assertion mistakes: side effects, catching AssertionError, using in production flow.
strategiesscripts/script.sh strategies
Assertion strategies for different contexts: unit tests, production code, APIs, libraries.
helpscripts/script.sh help
versionscripts/script.sh version
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