javascript SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
javascript from dojocodinglabs/code-sensei is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dojocodinglabs/code-sensei/javascript@git:20260207.d76e1caPins git:20260207.d76e1ca in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dojocodinglabs/code-sensei
- Path
skills/javascript/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260207.d76e1ca, committed Feb 7, 2026
- Size
- 2,785 bytes
- Repository stars
- 14
- License
- MIT
JavaScript essentials for vibecoders. Activated when Claude works with .js/.mjs/.jsx/.ts files. Covers the language concepts most commonly encountered during vibecoding.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# JavaScript — CodeSensei Teaching Module
## What is JavaScript?
- **Analogy:** If HTML is the skeleton and CSS is the skin, JavaScript is the brain and muscles. It makes things HAPPEN — clicks, animations, data loading, form validation.
- **Key insight:** JavaScript runs in the browser (frontend) AND on the server (backend with Node.js). Same language, two different environments.
## Core Concepts to Teach (in order of frequency during vibecoding)
### const / let / var
- `const` = a constant, can't be reassigned (use this most of the time)
- `let` = a variable that can change
- `var` = the old way, avoid it (mention only if Claude uses it)
- **Quiz:** "Why did Claude use `const` instead of `let` here?"
### Arrow Functions `() => {}`
- **Analogy:** A shorthand recipe card. Instead of writing "Function: do this thing," you write "=> do this thing"
- This is the #1 syntax that confuses beginners. Normalize it early.
### Objects `{}`
- **Analogy:** A filing cabinet with labeled drawers. Each drawer (property) has a name and contains something.
- `{ name: "Juan", age: 25 }` — the object has two "drawers"
### Arrays `[]`
…Read the whole file at its exact version.
How to install
mdr add dojocodinglabs/code-sensei/javascript@sha256:9a4b559a1c78e846The line at the top of this page pins the label git:20260207.d76e1ca, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_z7zbautzktc7muih)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Feb 7, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2785 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
dojocodinglabs/code-sensei · 14 stars · license MIT · pushed 2026-10-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_z7zbautzktc7muih GET https://markdownregistry.com/api/v1/resolve?ref=dojocodinglabs/code-sensei/javascript GET https://markdownregistry.com/api/v1/blob/9a4b559a1c78e84633f1a8f40756632de69594f82839236e122e88e1399feefe
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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