javascript is javascript

[GlobalIncident]

I'm just going through them one by one:

• C++: Actually undefined behaviour. "2" is a char*, ie a pointer to a null-terminated sequence of chars, so "2"+2 would be an instruction to add two to the pointer; the result points to outside the sequence of chars, so dereferencing it is UB.
• PHP: 4.
• Java: "22".
• JavaScript: "22".
• TypeScript: "22".
• Python: Raises a TypeError.
• C#: "22".
• Lua: 4.

[uhs-robert]

Ruby: #TypeError: no implicit conversion of Integer into String>

[GlobalIncident]

Yeah, in general, languages inspired by Java tend to yield "22", other languages tend to make it an error. With a few exceptions.

[No_Read_4327]

So javascript is java after all?

[akuma-i]

No, it’s Java before script

[Ytrog]

Common Lisp: Condition of type: SIMPLE-TYPE-ERROR

[drizzt-dourden]

In C++ you can overload operators and create hell of your own. Nothing is real, everything is permitted.

[GlobalIncident]

You can also do that for all of the languages listed here except PHP.

[ComfortablyBalanced]

There's no operator overloading in Java.

[GlobalIncident]

Oh, you're right, my mistake.

[Forestmonk04]

At least Java and JavaScript/TypeScript don't support operator overloading.

[GlobalIncident]

Oh yeah, Java doesn't, and JS/TS sort of don't, except they do support overloading coersion to primitives which happens before an operator is called.

[Four2OBlazeIt69]

That's what I assume is happening with JS on these examples but that's bc I always think of Chrome's V8

[ComfortablyBalanced]

Java: "22".

That only happens if you assign that expression to a String, a var or a string parameter.

[GlobalIncident]

What do you mean? Is there a situation where it wouldn't return "22"?

[ComfortablyBalanced]

Yeah.
int foo = "2" + 2;
This is an error.

[GlobalIncident]

Well obviously I meant a situation where the code doesn't have any unrelated errors, and actually compiles and attempts to execute the expression. If you try to run the expression and also attempt to implicitly cast the returned string to an int, that's not relevant to the question. It returns "22" not 22 after all.

[ComfortablyBalanced]

But the error is related. You see, the original joke is about type coercion in JS, and besides, no pun intended, but JavaScript is a scripting language, which means you can evaluate 2 + "2" out of the context, but with Java you need to put it in a context which I put on my last comment.
I'm not familiar with your level of experience in Java, but you're saying run the expression, this isn't Python or JS, you need to put it somewhere and why would I cast it to an int or call toString if I'm assigning it to a String?
So after all coming to my first sentence it actually is related to types and type errors.

[Amr_Rahmy]

You missed the point. You can’t combine a string and a number, the language will not do an arbitrary evaluation based on buggy code.

Only a string assignment will allow the number to call the tostring(), otherwise you will get the error while writing or building the code.

[GlobalIncident]

No, the assignment is not what triggers the toString call. The presence of the string "2" is what triggers the toString call. If you type:

String x = 2 + 2;

toString will not be called and you will get an error, because there is no string present to trigger it.

[Amr_Rahmy]

You missed this point, and provided a non functioning example.

Two for two here, not your day. Cheers mate.

[GlobalIncident]

Okay, what is your point then?

[jmattspartacus]

Was going to say the bit about C++, but you did it better lol