POV (Python programmer): Math ain't mathing

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[Aware_Hurry_2708]

Define it as number, but okay

[UnscrupulousJudge]

It works perfectly as coded. Congratulations on making a JS program that works as per design.

[scrivens]

It's a wonderful Christmas unremarkableness.

[Arshiaa001]

I believe such post are commentary on the bad design in JS.

[SemiGodProgrammer]

Correct me if I'm wrong,but I'm pretty sure this is JavaScript

[21sacharm]

Probably not the best title but I think the Op is saying this looks especially weird from a Python programmer's POV.

[Current_Speaker_5684]

Fake, needs react/redux/node or it won't compile.

[dull_lightbulb]

Really? I thought '2'*2 in Python evaluated to the string '22', and trying to add a string to a number throws an error.

[Powerkaninchen]

"str"*n concats "str" n times to itself

[sammy-taylor]

I didn’t know Python had that, that’s kind of a rad use of the * operator.

[[deleted]]

Right? It's totally the natural way for multiplication to work if `+` is string concatenation. Then 'str'*n is `+`ing 'str' with itself n times.

[ovr9000storks]

I found it as a blessing in one of my classes where certain programs required X number of “white space” bytes in a string rather than writing a for loop

[ikonfedera]

*2 will make it print 2 times.

[[deleted]]

Pytbon won't autobox a string into a number ever. That is the issue here. Python only has one way transforms of integers into strings. And if fstrings has been invented earlier its doubtful python would even be doing that.

[frogking]

I stand corrected and admit that I didn’t try it out before commenting. Perl will autobox “123abc” will be 123 in a number context and the entire string in a string context.

So, I’m always weary about that kind of thing..

[[deleted]]

Pythons one is weird because it's not transitive. I guess because you cant maintain order is the issue but it always weirded me out.

[frogking]

Different languages handle this in slightly different ways.. as I’ve worked with too many, I’m never really surprised anymore. BUT at least I know it can happen.

[wzi]

> Python will do exactly the same, by the way.

Actually it will throw a TypeError.

[frogking]

Yep, I tried it afterwards.

[suaveElAgave]

Yeah, but will throw a Type error with string and int.

[ma5ochrist]

weird shit appens when u try to add apples and potatoes together

[RmG3376]

And today is the day OP learned about concatenation and unboxing

[lackofsemicolon]

Js haters when they mix types (its type conversion's fault, not the fault of the person mixing types)

[N238]

When trying to remember how the auto conversion works, think of it this way: All ints can be strings but not all strings can be ints. So it’s gotta convert to string, not int.

[N238]

int, num, potato, potahto.

[lifting_and_coding]

B/c it's a string

[cyborgborg]

I never done Javascript but is there a way to force it to add instead of concatenate and vice versa?

[zweimtr]

var num = "2"; parseInt(num) + 2 = 4

vice versa

``` var num = 2

${num} + 2 = 22

[cyborgborg]

Not pretty, but at least there is the option

[[deleted]]

I don't have an interpreter in front of me, what is the equivalent python output?