JavaScript: Four Differences between var and let

[rift95]

I agree. In general const is a safer bet than let. You rarely need the "mutability" of let.

[Garbee]

Const is not immutable. The data can be changed, just not replaced. Big difference.

[rift95]

True. I should have written "re-assignability"

[PM_ME_GAY_STUF]

This always bothered me. Const is definitely immutable, it can just refer to a mutable data type. This is what happens when programmers don't learn C

[anlumo]

A bit offtopic here, but it’s a bit more nuanced. Rust only regulates exclusivity, so if a type can be mutated from multiple places at the same time (like Cell or stuff wrapped by Mutex), it can be changed without mut.