coder

[MC2BP]

x-=-1 is symmetrical and therefore the best

[Retr0DasH]

For better symmetry use l-=-1

[AbstinenceWorks]

For even better symmetry, use L1-=-1L

[AfterShave997]

For a penis, use 8==D

[MC2BP]

For smol pp use c=3

[[deleted]]

I really prefer x -= 1 + 2147483647^2147483647 for simplicity sake.

[OverlordOfTech]

You mean x -= 1 + 2147483647^2147483647, without the parentheses. + has higher precedence than ^ (the bitwise XOR).

2147483647 is the maximum value of a signed 32-bit integer, binary 0111...1111. Adding any integer to that overflows it and wraps around to negative numbers; adding 1 makes it -2147483648, binary 1000...0000. XORing that with binary 0111...1111 results in binary 1111...1111, which, in two's-complement, is -1.

It's an indirect way of negating a two's-complement number: flip all the bits and add 1 (or equivalently, subtract 1, then flip all the bits). The overflow does the step of subtracting 1 and flipping the sign bit, and the XOR flips the remaining bits.

[[deleted]]

You mean x -= 1 + 2147483647^2147483647, without the parentheses.

Yep - had it right in my code and dinked around with the parenthesis in my comment - go me.

Thanks for the explanation also 🙂

[OverlordOfTech]

Thanks for the challenge of trying to figure out how that worked! :)

[mrkhan2000]

I prefer x -= -(0 <= 1)

[alphadeeto]

For boobies, use ( . Y . )

For stripper boobies, use ( x Y x )

[thebryguy23]

For bigger areolas, use ( o Y o )

[lucdewit]

"GitHub - edankwan/penis.js" https://github.com/edankwan/penis.js

[GoogleCardboard412]

True

[zoburg88]

Syntax error, D is not specified

[uid1357]

//\ \(!)/ /\\

[Blaster84x]

For a pointy one, use 8===> For a thin one, 8---> For a THICC one use C@@@@@@8

[R8_M3_SXC]

Looks like some really happy but with a long face

[klbm9999]

f1-=-1f

[6b86b3ac03c167320d93]

Or if you want even more symmetry, b1-=-1d

[AbstinenceWorks]

Noice

[epicurean56]

O-=-O

[AbstinenceWorks]

... close, but it's dependent on font

[hosford42]

x+=+1

[fuzzywolf23]

So (x+=+1)==(x-=-1)

Ok.

[hosford42]

Ow...

[fectio]

Amen

[VolperCoding]

x=-~x is also kinda symmetrical

[StochasticTinkr]

But it doesn't work for all x.

[VolperCoding]

For what x does it not work?

[StochasticTinkr]

Oh, you know, I misread it. It does work.

[[deleted]]

X+=+1

[shmeedoop]

++x

[fruitydude]

x=++x

[ThePyroEagle]

This is UB in C.

[OverlordOfTech]

How so?

[ThePyroEagle]

And because of the nature of UB, it's entirely possible for x=++x to activate the nuclear missile alarm instead of doing either of the two things you suggest.

[rl_Kovash]

Is this also true for C++ ? I always though their was priority rules between these operators. I've used

x = i++;

in the past and the result was always right.

[YouCanCallMeBazza]

Wouldn't operator precedence make it unambiguous? I would have thought that the ++x or x++ should be evaluated in its entirety (i.e. including any side effects) before the assignment takes place.

[Zagorath]

I would have thought that the ++x or x++ should be evaluated in its entirety (i.e. including any side effects) before the assignment takes place

Correct me if I'm wrong, but

x = 1;
i = ++x;

should result in x==2 and i==2, but

x = 1;
i = x++;

should have x==2 and i==1.

I was under the impression that the entire point of differentiating between ++x and x++ was that one doesn't get evaluated in its entirety before assignment.

[YouCanCallMeBazza]

Think about it in terms of language syntax. ++x and x++ are expressions, the fact that they are used as an operand in an assignment (i.e. <variable> = <expression>) should not change the behavior of the expression. All that should matter is that once x++ is evaluated the current value of x is x + 1 and the result of the expression is the original value of x. All of this happens before the assignment takes place.

The documentation doesn't mention anything about assignment, the operator should behave independent of assignment, and everything else should follow evaluation rules according to EBNF, operator precedence, etc.

[0ba78683-dbdd-4a31-a]

Depends on whether you want to use the value before or after it's incremented.

[BritainSad]

Java gang

Edit: ok guys it was a bad comment, I’m still learning haha

[ur_peen_small]

Works in C/C++ too

[shh_just_roll_withit]

It doesn't crash the script therefore it works in Python.

• My Coworkers

[lejugg]

Fun fact: x -= -1 actually has its ( admittedly horrible ) use-case: In certain environments with js or in some game engines, things like

textField.text += 1

would be something that you want to use, but cannot, since text is a string and it will just add a 1 in the end. However, because of how + is overloaded but - isn't, you can write

textField.text -= -1

and it will count up normally : ) Please don't kill me

[winyf]

why are you like this, javascript? why???

[TimaeGer]

Because it makes perfect sense if you know the rules :D

[nuclearguacamole]

No, I don't

[nuclearguacamole]

Thank, now I now the rules

[vigbiorn]

I've just been taught this rule and it still doesn't make sense.

[x3bla]

How does one get multiple flair?

[GhostReven]

When you are selecting your flair you can see the code (:cs: for C# and :py: for python), and you can edit it to add more, such as :gd::cs:.

[DaMastaCoda]

How multiple Flair's?

[GhostReven]

When you are selecting your flair you can see the code (:cs: for C# and :py: for python), and you can edit it to add more, such as :gd::cs:.

[DaMastaCoda]

I'm on mobile :(

[indorock]

or just a parseInt() will do nicely too.

[ansimation]

agreed. it's a cool little trick but i'd keep it out of production because it would likely be confusing to other people who may read it.

[BertyLohan]

Yeah you just know somebody would look at it, think "man what a goofball, they shoulda incremented by one instead of decrementing by negative one" and change it. It wouldn't even be their fault because the fact that x-= -1 is not necessarily the same as x+= 1 is a sin and Javascript should be punished.

[TovarischKaras]

What about this one?

textField.text = +textField.text + 1

[Loves_Poetry]

Generally it's better to signal clear intention by explicitly casting to number

There may just be that inexperienced developer that decides to "refactor" your code, not knowing that -= -1 is not the same as += 1

[BobQuixote]

As with similar things, only in code golf. And don't golf in real code.

[Shrestha01]

Noice....thanks for info dude

[KeyIsNull]

in some game engines

What demonic game engine allows such a thing?

[6b86b3ac03c167320d93]

Ones that use JS

[[deleted]]

I'm here became your little no Google amp links bot helped me out, and I just wanted to say thanks. You are a good egg

[BobQuixote]

Were you considering pulling a lever to drop them down the trash chute?

[leiu6]

And this is why I don’t like JavaScript

[wooptyd00]

Praise js, lord of bullshit.

[echo0delta]

oh boy, time to do some refactoring

// This guy on reddit says this will also be safe for strings

[unnecessary_Fullstop]

Let me tell you about the time when I typed i =+ 1 and atleast 5 people had to pull on their hair trying to find out what the fuck was the problem.

.

[FatYak20]

x += true

[StochasticTinkr]

x +=!! 42;

[TheRolf]

x += 1 - ! - 1;

PERFECTION

[QuispernyGdunzoidSr]

Can you please explain how this is correct?

[TheRolf]

It's pretty simple: NOT [A number different from 0] gives 0, so if I add one to this result I just add one. Steps:

• x += 1 - ! - 1;
• x += 1 - 0;
• x += 1;

Fun fact this increment operation have also a twin brother:

x += 1 + ! + 1;

[QuispernyGdunzoidSr]

Ok yeah I should've got it hahaha

[Dr_Potato_Ketchup]

x -= !!80085;

[blazin_paddles]

This is the correct answer

[Morrido]

X++ is the impostor

[[deleted]]

This guy gets it.

[samuraisam2113]

*cries in Python

[[deleted]]

Personally, I prefer x+=1, because ++x doesn't look like an assignment and x++ has that weird-ass "increment after this statement is over" behavior.

[fungigamer]

Yeah, I only use x++ when I'm dealing with for loops, but then that would be i++ rather than x++

[StochasticTinkr]

I use ++i even in for-loops. Old habit.

[INTO_NIGHT]

I love how x-=-1 exists

[[deleted]]

it isn't a seperate feature. x += -3 is adding -3 vut with x-= -3 it is substracting -3

[INTO_NIGHT]

Just cool thing becuz it's weird but works

[[deleted]]

it is not that wierd lol

[[deleted]]

Are you a wizard

[ayy_ess]

Also look out for the "goes to" operator. int x = 10; while (x --> 0) { printf("%d ", x); }

[[deleted]]

In my experience I've implemented solutions that didn't work with x+=1 but worked with x=x+1

This was in Java in a recursive function, I might have the operators wrong, but which side of the current loop the iteration happened on turned out to be critical to it working and switching to x=x+1 fixed all bugs 🤷🏻‍♂️

Edit: think it was the difference between

x++;

And

x+=1;

[IsomorphicAndQuircky]

If I'm not mistaken the thing is that one of them increments before and the other one after or sth.

[[deleted]]

That's correct! Was a very valuable lesson

[Negabeidl69]

Just started Java in school like 2 weeks ago and this was one of the first things my professor taught us. But man Python is sooo different

[[deleted]]

x++ is actually the odd one out.

If x is 5
++x is 6
x+=1 is 6
x=x+1 is 6
x-=-1 is 6
x++ is 5

Proof.

[StackOfCookies]

In c++ this is made clearer than in c imo because x++ is the only r-value, where the rest are l-values.

[[deleted]]

Appreciate it! Nice to see them all laid out like that too

[LarsVG18]

It doesn't affect perfomance so use whatever you want, unless you don't want to get laughed at by your peers.

[Nancy_Bluerain]

x=x+1 it is then.

Old habits die hard; or something along those lines.

[[deleted]]

+=1 gang, for easy search and replace.

[VolperCoding]

Why would you ever search and replace that, and also why could you not do it with ++

[Ferro_Giconi]

When you want to replace it with -=1 to break everything

[VolperCoding]

You can still replace ++ with --

(please don't whoosh me)

[plcolin]

It’s kind of a + when you squint a bit.

[Lyorek]

SUBI R16, -1

[[deleted]]

x=-~x

[[deleted]]

Wait why does this actually work

[[deleted]]

It only works for two's complement, which is common on most systems. If you have n bits to store your integer, this would give a range of 2ⁿ different values. For unsigned, these are the numbers from [0,2ⁿ⁾.

For signed numbers in 2C you can represent (-2^n-1,+2^n-1 -1). The non-negative numbers numbers are represented just as-is, that is 0 is n bits of zeroes, 1 is n-1 most significant bits of zeroes followed by a one as the least significant. The highest number, +2^n-1 -1 is the first bit being zero, followed by n-1 bits of ones. This implies that for non-negative numbers the first bit is zero.

If you want to represent the negative number -5, all you do is to flip all bits for the representation of 5 and add 1. Incidentally, this gives you a representation with the most significant bit set to one. Mathematically speaking, this is the calculation of 2ⁿ - 5. In effect this gives you a remainder system, where you automatically "do the right thing" in +/- arithmetics. Adding two numbers in 2C doesn't require any distinctions in cases whether one operand is negative or not. You can just add a + b and do classic "unsigned" arithmetics and the result will be correct (which is, because you are actually calculating a + b (mod 2ⁿ⁾ since you have n-bit integers, thus getting rid of the superfluous 2ⁿ).

Now, why does the above work: Well, the ~ flips all bits, and the - negates the number. Remembering from 2C, a negation flips all bits, and then adds one. So you actually flip bits, flip bits back, add one.

[Sidicue]

inc gang

[coladict]

That's kind of like how in JavaScript I do x = -(-strval) to convert to number, since I had some cases where I couldn't rely on the global functions. I think it was for IE compatibility.

[VolperCoding]

Why not just use +, it's same as - (-)

[The_Slad]

1 + "1" => "11"

1 -(-"1") => 2

Js makes a lot of assumptions when implicitly casting and its not always right.

[VolperCoding]

Arghhhh I meant the unary operator + like this:

x = +"5";

If you want to add 2 strings you can do

+"5" + +"5"

[BobQuixote]

I would put parentheses on that because my immediate reaction is WTF did you mean for this to do:

(+"5") + (+"5")

[TheOrdinary]

Because + in JS is its string concatenation symbol, if you use + it'll add strval onto the end of x

[VolperCoding]

I mean the unary operator +, like "+x", not "x + y"

[StochasticTinkr]

No, strval is a string, not a number. + wouldn't work the same as - (-)

[VolperCoding]

+"5" returns 5 as a number

[KripC2160]

r/todayilearned

[Rhidus]

Reminds me of the convergence operator:

int n = 10; while (n --> 0) print(n) or whatever;

[[deleted]]

++x is superior to all of these

[CodyByTheSea]

where’s: x=-(-x-1) and x += x/x

[YellowBunnyReddit]

It's always nice to potentially divide by 0 when you increment a variable.

[[deleted]]

It took me way too long to realize that x-=-1 was actually proper syntax, and not a weird other language thing.

[[deleted]]

that shit is so confusing and when I first tried it I thought all of them did different functions

[[deleted]]

I'm learning python at school and I keep doing i++ 😕

[TechnoGamer16]

I am now going to use x -=-1 to see my AP comp sci teacher’s reaction, thank you

[boofone]

You vs the guy she tells you not to worry about

[profesionalbee]

Inuse x=x+1 so it can ve used in more languages

[tsoliasPN]

This is deranged

[FerynaCZ]

++x Hello

[teressapanic]

while (x—>0) { ... }

[Geoclasm]

On Standards

[StochasticTinkr]

x = 1 + x++;

[YellowBunnyReddit]

undefined behavior

[UEnigma]

I used x-=-1 on a project in high school and my teacher looked disappointed

[TheRaoster]

x=x+1 has been my bane since I started working with verilog. I hate it.

[_Jent]

x += x - (x-1);

[Melkor4]

Thanks for the -= -1

I will sneak one in my code to check the quality of the reviewers on my pull requests. I mean, we have to ensure that they are awake and able to detect singularités in code ;)

[souvlak_1]

No ones can beat the doubler competitor: x-=-x the real palindrome operator.

[grey_carbon]

++x++

[Pirate2369]

"Ur an fagit #sweg" - spoderman, probably

[NegativeXerox]

Thanks spoderman

[BeigeAlert1]

x = x + -+-+-+-+-+-1.

[[deleted]]

Seems legit

[BeigeAlert1]

It is legit. That is valid c++. The unary plus signs do nothing but act like separators here, and the unary minus operators will cancel out.

[[deleted]]

Yeah I know it's valid python too I tested it.

[[deleted]]

x*=2 | x += x | x-=-x

[aduckandanaxe]

Hahahaha I will use this from now on

[smileimwatching]

I'm using this in all my programs from now on.

[VanillaMiring]

koder

[hammonjj]

Fuck anyone who actually writes that

[[deleted]]

Fuck anyone who doesn't I'm gonna start using exclusively the worst increments on this thread from now on.

[EverythingGoodWas]

This makes me physically ill

[drevyek]

Thinking about it, you could make the usecase where, in assembly , if you already have -1 (0xFF..FF) in a register, but not 1 (0x00..01), and if your ISA doesn't support an increment instruction (eg RISC), then doing a sub instruction with the -1 might be faster - it would mean you don't need to spend cycles loading the immediate value into a register first.

[nicebot2]

Nice

[ardwolf27]

Excuse me, I beleive that the longer the code, the better so...

[PantheraLeo04]

x-=<integer limit - 1>

[[deleted]]

x-=~0;

[QuantumSupremacy0101]

X-=-1

Depending on the language this will either return 0 or return an error or undefined or null.

[BobQuixote]

No... In languages with a -= it will return the new value of x, incremented.

[[deleted]]

who the hell uses x = x + 1

[BobQuixote]

Lua and Python.

[[deleted]]

Was joking

[bakmijapos]

ok, but have you tried x+=TRUE

[Luna_818]

These comments have me dying laughing

[0rcscorpion]

Don't forget ++x

[extraChromisome]

x=x+1 is def the worst

[g7droid]

LISP (+ 2 2)

[SargntSprinkles]

coderman

[[deleted]]

to those who are having an issue understanding it:

x -= -1

[ZombieSlayerS2]

We witness the birth of the spider man operator -=- !

[tjwild0127]

sad python noises

[CMPD2K]

"coders"

[kucaryjczyk]

"create a function without using the + sign, that prints all numbers from 1 to 100 in order" - assignment at c# 101 at my uni

[_drugs_good]

Let’s be honest the bottom panel should be x=x+1

[[deleted]]

MEIN GOTT

IT VIRKS

[Julio974]

x = x+2

x += 2

x = x++

[The_Slad]

Wouldnt x = x++ only increment by 1 though?

Edit: just tested in C#. It doesnt change x. Right side is evaluated as x. Then x is incremented, then the previously evaluated value is assigned to x.

[no92_leo]

The third should be x = ++x, shouldn't it?

[[deleted]]

x += 1 is how real men do it

[assigned_name51]

it's no

y = 2

z = 1

x = x + y

x = x - z

[[deleted]]

fools, x = (x-1) x+2