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JavaScript core concepts v1.0.0

Use this resource to explain or debug JavaScript's subtle behaviors

New

  • 352 downloads
  • 214 likes
  • 207 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install javascript-concepts-reference

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent explains a JavaScript concept or analyzes a surprising behavior: primitive types, coercion, equality, scope, closures, hoisting, the this keyword, the call stack and the event loop. It draws on a reference organized by theme. You get a clear explanation with the mechanism detailed.

Mostly picked by

Updated November 2, 2026

Card for the “JavaScript core concepts” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

Similar resources

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What you get

  • SKILL.md: use cases and the thematic outline
  • sub-skills/: notes on types, coercion, scope, closures, hoisting, this and the event loop

Good fit for

  • A bug comes from a surprising this or var behavior
  • You want to explain the event loop to a beginner

Not for

    Tags

    • javascript
    • closures
    • event loop
    • fundamentals

    About

    You say

    “Explain why this code prints undefined instead of the expected value, starting from hoisting.”

    Card for the “JavaScript core concepts” skill

    Skill published by dokhacgiakhoa under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to explain or debug JavaScript's subtle behaviors
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE2.4 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md2.3 KB
    • sub-skills/11-primitive-types.md0.5 KB
    • sub-skills/12-type-coercion.md0.4 KB
    • sub-skills/13-equality-operators.md0.4 KB
    • sub-skills/21-scope-types.md0.3 KB
    • sub-skills/22-closures.md0.5 KB
    • sub-skills/23-var-vs-let-vs-const.md0.4 KB
    • sub-skills/31-call-stack.md0.4 KB
    • sub-skills/32-hoisting.md0.4 KB
    • sub-skills/33-this-keyword.md0.6 KB
    • sub-skills/41-event-loop.md0.4 KB
    • sub-skills/42-callbacks.md0.5 KB
    • sub-skills/43-promises.md0.6 KB
    • sub-skills/44-asyncawait.md0.6 KB
    • sub-skills/51-higher-order-functions.md0.3 KB
    • sub-skills/52-pure-functions.md0.4 KB
    • sub-skills/53-map-filter-reduce.md0.6 KB
    • sub-skills/54-currying-composition.md0.8 KB
    • sub-skills/61-prototypal-inheritance.md0.5 KB
    • sub-skills/62-object-methods.md0.6 KB
    • sub-skills/71-destructuring.md0.4 KB
    • sub-skills/72-spread-rest.md0.3 KB
    • sub-skills/73-modules.md0.3 KB
    • sub-skills/74-optional-chaining-nullish-coalescing.md1.4 KB

    Origin and licence

    Listed unmodified

    Author
    dokhacgiakhoa
    Source
    github.com/dokhacgiakhoa/agent-skills-4-vibe-coding-cli/tree/c4a059bbf7a8d6b2162071f0fbfe74053faa6d20/.agent/skills/javascript-mastery
    Licence
    MIT

    Notice

    « javascript-mastery » (dokhacgiakhoa, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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