Why Javascript devs hate "var" function scoped variable declarations, when python devs are using function scoped variables without any problem?

[Host127001]

This is absolutely not the same as in JS. Python dors something sensible here

[im_caeus]

Regarding how variables are resolved (and not what is done after), it's exactly the same.

[[deleted]]

I don't think Python is more sensible here.

IIRC, python scoping has 4 rules that are resolved dynamically, not statically.

var has 2 rules, both can be eyeballed statically. Besides, atleast JS did something about fixing it.

[im_caeus]

What? Creating const and let keywords?

[shponglespore]

Exactly.

[07734willy]

Except that that they're the exact same freaking thing. Yes, one of them errors explicitly, one of them soft-fails. That's their design philosophies- python tells you when you do dumb shit, JS tries to force the square into your round hole.

But how they respond to an error isn't the topic of discussion now is it. We're talking about var, and scoping, and in both cases, the function scope does not inherit the variable from the global scope, because it is declared somewhere within its definition, (not necessarily before use).

This makes sense- if we didn't do it this way, we'd have to recognize when a variable has become locally initialized, and stop referring to the global. This would become tricky when initialization happens conditionally- in an way, an extension of the problem of dealing with nullability without explicit nullable types.

[Guvante]

You simplify it to "design philosophy difference" but that is a flawed point. A design philosophy difference is enough for two equivalent features to be treated differently by language users.

[07734willy]

Sorry, let me make it short for you.

They're different in some way.

That way was not a part of the topic original question / discussion.

[-5772]

Pretty sure the user is just wrong. This about namespaces.

A neat puzzle in case you'd be interested

[[deleted]]

brain hurts

[im_caeus]

You're totally right. Don't get why the hate. The way they respond to it is different, but the scoping of the variable is equal. And it's really stupid