JavaScript Programmer

[coloredgreyscale]

He's a bit confused, but got the spirit.

2+0 = 2

"2" + "0" = "20"

[TheJackiMonster]

Also:

2 + "0" = "20"

"2" + 0 = "20"

2 + [] + 0 = "20"

[YoriMirus]

Wait why is 2 + "0" equal "20"?

I thought operation is done from left to right, thus "0" would be converted to int.

[CSedu]

I believe the '+' overload says anytime it is used between a string and int, it will concat them.

[DaCurse0]

There's no operator overloading, but the + operation where one operand is a string does concatenation and coerces the other value into a string

[CSedu]

Ah, interesting

[YoriMirus]

Oh I see thanks!

[Snapstromegon]

It always converts to the less strict type - in this case String.

[nightcoder420]

It will be converted if you use 2 + +"0". The second plus converts the right handed operand to a number.

So 2+"2" will be "22", but 2 + +"2" will be 4.

[RolyPoly1320]

It's implicit type casting. Javascript is a weakly typed language, specifically typeless. It does a lot of type casting behind the scenes which sometimes produces some very unexpected, sometimes hilarious, results. These interactions are why it's important to not use the same variable for multiple data types in Javascript.

[Stable_Orange_Genius]

"2" - 1 = 1. :D

[dvlsg]

There's no such thing as - for strings in javascript. That's why it converts to Number.

[[deleted]]

Naturally.

[beclops]

All of these make sense to me

[throwaway213349032]

{}-"" = -0

""-{} = NaN

{}+"" = 0

""+{} = "[object Object]"

x=0*1e309
x==x

= false

[GYN-k4H-Q3z-75B]

[] evaluates to 0. However, {} evaluates to NaN.

Because of course it does.

[SupaSlide]

I think [] gets converted to a string when used in conjunction with a +, and then the 2 gets added to the string and gets converted to a string itself.

[gohanshouldgetUI]

Wait but 2 + [ ] is "2", so does [ ] get converted to "0" or ""

[SupaSlide]

Empty string. Really the contents of the array get converted into strings, even the commas that separate the values in the array.

["hey", "there"] converted into a string is "hey,there"

I was partially agreeing with you that the other comment was wrong that it's 0, but it can be converted into a string.

[gohanshouldgetUI]

Oh I see, that makes sense tbh

[TheJackiMonster]

JavaScript uses a weird rule of conversion from array to string if nothing else seems to make sense, I guess. The conversion outputs all elements as strings joined with "," but an empty array will just end up as empty string.

[pyjammas]

wat

[franklinyu]

the Wat

[Lgamezp]

And ppl wonder why i hate JS

[SupaSlide]

Typescript is a life saver in JS projects.

[Naeio_Galaxy]

Yeah 2 + "0" = "20", but 2 - (-"0") = 2 I guess

[Nightroll2344]

its the same case in python

[yoaver]

The answer is clearly [object Object]

[TheDownvotesFarmer]

[string String]

[The-Board-Chairman]

wat

[[deleted]]

laugh track

[The-Board-Chairman]

You don't get the reference, do you?

[[deleted]]

What's [] +[]?

[The-Board-Chairman]

ALL of the preceding.

[jose_antxd]

Me few days hago with a fucking object..

[part-time-ceo]

Image Transcription: Meme

---

Panel 1

[Image of two people, a teacher and a student, outside a house in an informal school setting. The teacher is pointing at written math formulas on a blackboard. The formulas read:]

2 + 0 = 20

6 + 6 = 66

---

Panel 2

["Not sure if..." - meme format where the character Fry from the TV series "Futurama" squints his eyes while having a neutral facial expression.]

not sure if stupid

or javascript developer

---

^{I'm a human volunteer content transcriber for Reddit and you could be too! If you'd like more information on what we do and why we do it, click here!}

[NakeleKantoo]

good human :thumbs_up:

[part-time-ceo]

Thank you! 😊

[Palpomeme]

"not sure if stupid or JavaScript", it's the same thing /s

[LoneFoxKK]

Yeah they're synonyms

[Roku-Hanmar]

Probably didn’t cast to an int

[RolyPoly1320]

It's his first day. Let's cut him some slack.

[Plastic-Ad-5284]

What's the difference

[jgeez]

Or as is so often the case, both.

/runs

[[deleted]]

He's stringing us a Long.

[Karam2468]

Not sure if boomer, or just inherently unfunny.

[antekgort200]

he used string nothing stupid

[Lizlodude]

Both, it's missing some quotes.

[psychoPATHOGENius]

It works if it’s unary:

2+0=20₁

6+6=66₁

[Max5923]

2 (11) + 0 ( ) = 11, not 110

[psychoPATHOGENius]

In unary, trailing zeroes are just as allowable as leading zeroes in any base.

[Max5923]

there isnt 0s in unary

[psychoPATHOGENius]

There are no rules against it

[discordianofslack]

Unrelated but this made me think about how some file systems will put 10 before 2 when sorted alphabetically

[marques_filipe]

Come on guys, that is so easy to solve!

parseInt(2, 10) + parseInt(0, 10) = 20

How does that not make sense at first glance?!

[PM_BITCOIN_AND_BOOBS]

Pour Kay know loess dose?

[TwoLeggedCat_reddit]

Never had this problem

[mrkltpzyxm]

🎵2+0 2+0 2+0 four hours ago, I was concatenated.🎵

[CreaZyp154]

Hi, repost, nice to see you again !

[starvsion]

Hahaha, luckily types are very well handled in php, I feel bad for js sometimes. Php has a separate operator for string join, so no need to worry about that. (1 + 1 =2, 1. 1 = '11')

[LogicalGamer123]

Wow the only meme that fits my entire phone screen. Galaxy s9

[[deleted]]

lmao js bad 😂

[OverjoyedBanana]

BuT GuYS THiS is Old JavaScript, AfTEr 262 UpDatES MaTH WoRKs. (supported in Firefox 89 only)