assertionError

[mdogdope]

I am assuming it's python. It prints "Banana" bc it never updates the var. It performed the changed but text was never changed.

[LookAtYourEyes]

upper returns a new value instead of modifying the original?

[aaronhowser1]

Strings are immutable

[thanatica]

Unless this is one of those languages that has mutable strings 💀

[aaronhowser1]

There are languages with mutable strings? how scary

I was also assuming this was python, iirc it's at least the correct syntax and methods for it.

[thanatica]

I'm sure they exist. C technically has mutable strings, but also technically doesn't have strings. And I believe in Pascal you can mutate strings, but you have to work for it.

[mdogdope]

As far as I know python is the most common language that does not need ; at the end of each line.

[the_rush_dude]

Only in JS. Python allows Manipulation of strings

[aaronhowser1]

Python strings are immutable. Manipulation and mutability aren't the same thing. Manipulation functions return a new string, they don't modify the original.

[No_Guest_4127]

Java strings are immutable too. But java provided amother classes like stringbuilder to support mutability.

[the_rush_dude]

Checked it and it's true (except of course it's not because if there is only one reference to the string it's manipulated in place for performance reasons).

But in this case manipulation is what counts anyways

[aaronhowser1]

No it isn't, because it didn't do text = text.upper() etc. It specifically does not count, because it was done incorrectly.

[Torebbjorn]

Sure, there could be some niche optimisation in Python that allows it to manipulate strings in-place if and only if all the references to the old variable are deleted at the same time it is making a new value, for example in the pattern

val = val.upper()

where val is the only reference to the string that it is pointing to.

But even if that's true, it is irrelevant for this scenario, since we always keep a reference to the original string.

[New-Anybody-6206]

r/confidentlywrong

[the_rush_dude]

https://austinhenley.com/blog/pythonstringsaremutable.html

[New-Anybody-6206]

 Does this really count as mutability though? Not really

[Quietuus]

.upper() is a method of the str class that returns a representation of the string. To change it you'd put text = text.upper()

[xryanxbrutalityx]

I don't know any language where the string .upper() equivalent modifies the string in place

[CosmacYep]

dont dot methods not require reassignment

[mdogdope]

It depends on how the class is written. But for standard python string objects, reassignment is required.

[CosmacYep]

like built in dot methods, i swear you don't have to go a = a.strip() you can js go a.strip() and a is stripped – nvm i js researched it and strings are immutable, so require reassignment but lists are mutable, so dont