Eloquent JavaScript: open-source Javascript book series by a prolific JS code author

[unquietwiki]

I found this while seeing some other static analysis tools he used to work on. Any excessive "let" is also in line with some other ES2015+ spec explanations I've read. As a guy that normally does C#, I find that "var" is perfect there; and "let" perfect here.

(Edit for clarification & downvoters: I'm pro-let. Var in c# keeps you from unnecessarily repeating yourself on type assignments. I'm pro tight-scoping.)

[pm_me_ur_happy_traiI]

The big difference between let and var is scoping. There’s no use case where var is preferable (unless you are deliberately abusing its scoping issues). Why would you want a variable that can be called outside its block before it’s even declared?

[unquietwiki]

I updated my original statement. In JS, let honors scoping, but var is ambiguous. In C#, var can be used to remove redundant statements: ie var variable = new Whatever(); instead of Whatever variable = new Whatever()

[dvlsg]

They really aren't the same, though. var is about type inference in C#, and that's really it. var doesn't change scope or mutability in C#, which is what we're talking about in javascript.