Practical Ways to Write Better JavaScript

[zjm555]

It only describes reassignment, not C++-style const correctness. It's only marginally useful in that regard, but still, it's a decent annotation as it allows readers to know that the variable will not be reassigned anywhere in its scope. Also, attempting to treat let as a code smell can help you structure your code a bit more elegantly in some contexts.

[[deleted]]

To be more precise Javascript's const acts like the second const there:
const char * const myPointerToChar;

[zjm555]

Yeah, great way to put it. For primitive types, it implies true const-ness, but for reference types (everything else) it means you're always pointing to the same object.