js-micro-utilities_skill

Overview

This skill provides a compact guide and set of zero-dependency JavaScript micro-utilities that prefer native APIs and fall back to lightweight just-* packages only when necessary. It helps you choose native one-liners first, then recommends tiny, well-scoped packages for edge cases and complex algorithms. The aim is readable, predictable code with minimal dependencies for object, array, string, number, and function tasks.

How this skill works

The skill inspects common needs (diff, deep clone, grouping, debouncing, etc.) and maps each need to a native solution when available, shown in code-friendly snippets. When a native approach is insufficient or error-prone, it recommends a single-purpose just-* package and explains the trade-off. It emphasizes immutability, modern ES APIs (optional chaining, toSorted, fromEntries), and replacing bulky libraries with tiny focused modules.

When to use it

• When you want zero-or-low-dependency utilities for day-to-day JS tasks.
• When a native API provides a clear, readable one-liner (prefer native).
• When correctness or edge-case coverage requires a tested micro-package.
• When building small web components, vanilla JS apps, or educational projects for kids.
• When you need predictable, maintainable helpers without a framework.

Best practices

• Always check native capabilities first (e.g., structuredClone, Object.groupBy, arr.toSorted).
• Prefer immutability: use toSpliced, toSorted, spread, and fromEntries for transforms.
• Limit dependencies to single-purpose just-* packages when native APIs miss edge cases.
• Keep utilities explicit and documented in code — prefer short readable one-liners over clever abstractions.
• Install only the specific just-* packages you use; avoid importing large multi-feature libs.

Example use cases

• Deep-clone game state for undo using structuredClone or just-extend when deep merge is needed.
• Debounce text input handlers with just-debounce-it for search in a phonics game UI.
• Group creature cards by type with Object.groupBy or produce lookup maps via Object.fromEntries.
• Shuffle encounter decks with just-shuffle or dedupe collections using [...new Set(arr)].
• Immutable insert of drawing layers using arr.toSpliced to preserve previous state.