javascript-core-concepts

Explains JavaScript behavior — primitives and coercion, scope and closures, this binding, the event loop, promises, functional patterns, prototypes, and modern syntax — through small verifiable examples. Use when the user asks "why does this return undefined", "explain closures", "how does the event loop order this output", "what is the difference between == and ===", or wants a language concept reviewed while debugging. Not for TypeScript types, framework tutorials, or DOM/CSS styling questions.

Version

v1.0.1

Size

10 KB

Updated

2026-10-06

Your client verifies the signature before reading. This explicit manual read is available on every plan. Free automatically loads five chosen skills; paid plans automatically load relevant skills across the library.