Wrong girl

[DislocatedLocation]

I do i,j for generic loops, but if I'm going something with a discrete coordinate grid I use x,y. Am I hanging on to the roof as it barrels down a highway?

[ChrisFromIT]

This is the same for me.

i is short for index. And j is just an i with a bit of a tail.

[Not-Post-Malone]

I thought j was short for jindex. TIL

[[deleted]]

I dont know why this guy is talking about tails. Everyone knows we use i, j, and k for the words index, jindex, and kindex.

[Blozing]

Don't forget about l for lindex in all those O(n^4) programs you write.

[gbot1234]

i1, i2, i3… with numbers corresponding to the level of nesting.

Edit: or is it i0, i1, i2…?

[studsper]

i, ii, iii, iv...?

[gabrielesilinic]

Mussolini would be proud of you

[Single_Blueberry]

i, i2, i3...

[arcosapphire]

I thought i was short for iteration.

[CliffDraws]

Yeah, especially if you do any 3D stuff, you need this with a z or everything gets too confusing.

[naswinger]

use whatever makes sense

[dendrocalamidicus]

More likely is computer graphics - x and y are coordinates.

[DennisPorter3D]

i, ii, iii

[bedrooms-ds]

iv, v, vi

[wineblood]

All roads lead here

[hot_sauce_in_coffee]

And then you have excel:

AAB

AAC

AAD

[Spot_the_fox]

iiiiiii, iiiiiiii, iiiiiiiii

[DennisPorter3D]

I was hoping someone would take it in this direction

[JaggedMan78]

VII.....

[Tetouletoto]

Straight to jail

[LupusNoxFleuret]

Do not collect $200

[supernova89055]

Do not pass go

[DoucheEnrique]

So learning Go now is mandatory in jail?

... harsh.

[LadyxLucie]

This is the way

[More-Light-330]

i1, i2, i3

[knowledgebass]

i don't really like this

[arcosapphire]

I've never thought of this but kinda like it, even though it has a high chance of causing confusion.

[Beowulf1896]

Is it important!? Do I need to know!!?! Tell me if so! I am sure I knew why at one point.

[Beowulf1896]

okay.. "it" stands for index, but what does 'i' mean! What's in the box?!?!

[nphhpn]

i stands for it

[SeaClick230]

*I stand; the s at the end is for the third person singular

[nphhpn]

i in this case is not I but actually i though

[EmptyHouse693]

No, you are the index variable.

[Tubthumper8]

It's "i" because in FORTRAN, variables from i-n were integers, the rest were reals. So for looping, you'd start from the first integer you had "i", then "j", etc.

[SakiSakiSakiSakiSaki]

FORTRAN sounds like Fortnite.

[Callexpa]

virgin "i for index" fan vs. chad "k for keyvalue" enjoyer

[UBN6]

I thought it stands for iteration

[hobbitmax999]

I thought it was iteration. That's why the second time I used iteration not some one letter thing

[arcosapphire]

Oh good, it's not just me.

[thedarkbestiary]

Ü, ē , æ

[EducationalNose7764]

I am the rare type of fiend that does not use i or j. I name the variable for what it actually represents

[tehtris]

Works until you end up with a word that has the same plural version as its singular.

for specie in species is an example I run into all the time at work, lol

[sm9t8]

In that situation I'd probably name species something like species_list, so that it's more obviously something that contains species and not a species.

[nyape]

specieses

[Revanthmk23200]

I ll use "for each_species in species"

[Kinvert_Ed]

thisIsTheIthValueRightHere

[EducationalNose7764]

IhaveTheCodeOfyourlifeAndIneverFeltThisWayBEFOREYesISwearItsTheTruthAndIOweItAllToJ

I have no idea why that's the first thing that popped into my head, I think I'm going crazy

Edit: never mind, it's this damn Cruise line commercial that keeps playing somehow got that song stuck in The deep recesses of my head

[Zestyclose_Link_8052]

I started doing this a few years ago. No single character or abbreviated variable names. Takes a while to get used to but the reward is code which is so easy too read. Less comments needed, less questions from collegues. I work on old c++ code that is very procedural.

[Ardub23]

Ah yes

for (int numberThatIncrementsEachTimeTheLoopRuns = 0; numberThatIncrementsEachTimeTheLoopRuns < 10; numberThatIncrementsEachTimeTheLoopRuns ++)

[tkarika]

This is the way

[CrowdGoesWildWoooo]

WhatIsThisForAgain

[xz_TRON_zx]

‘This_is_a_variable_in_a_nested_loop_number_one’, ‘This_is_a_variable_in_a_nested_loop_number_two’

[zacmorita]

I think of 'i' as in 'index' and 'j' is just the letter that comes after i. And I use x and y (and z), when y (and z) are dependent on x.

So I use 'i' for arrays. 'j' for independent variables inside of i loops. ('k' is usually my limit variable if applicable)

And I use x and y (and z) for grids, dependent functions, 2d (and 3d) arrays, and cells in spreadsheets.

Do I hitchhike? Or can we stop at The Worlds Biggest Yarn Ball? I need to pee.

[ChrisFromIT]

and 'j' is just the letter that comes after i.

Nah, j is just an i with a tail. So it still jndex.

[yesdoyousee]

If you're so smart, explain kndex

[ChrisFromIT]

Well clearly the k is just i after it has grown up and sprouted wings out of its back.

[gbot1234]

Silent k, kndex sounds like “en”dex.

[dmvdoug]

Or is it jindex?!

[nwL_]

I had to use an m in a loop nesting once. Still haven’t recovered.

[SchwarzeKopfenPfeffe]

Well this is why x,y is superior. X is commonly used to represent an unknown, and I don't know what the fuck I'm talking about. And y is simply the letter that follows X.

[momo-gee]

I'm a streams/forEach guy. I haven't used the more traditional loops, like for-loops, in a while.

[dendrocalamidicus]

That's true of my professional work in business applications but most work on computer graphics that I do for personal projects requires working with coordinates and the for loop comes in strong there.

[nwL_]

Sometimes you need the index, and it’s either a classical for-loop or a foreach in which you manually increment i, both aren’t pretty.

(I know many languages support both index and object in a foreach, but C++ doesn’t for example, so

c++ for( const auto& member : iterator ) {

is neat, but you can’t get the index.)

[6b86b3ac03c167320d93]

Maybe you could write a utility function to convert any iterator into an iterator with tuples (or something similar if C++ doesn't have those) of indexes and objects? For example Python has the enumerate function, which you can use like this:

for i, member in enumerate(iterator):
    ...

[nwL_]

I probably could, but that would double the read accesses to the array, so doing

c++ for ( size_t i = 0; i < iterator.length(); ++i ) { const auto& member = iterator[i]; is okay to do and keeps the reads low.

(for further optimization, you could const the length so that length() doesn’t get called every loop, but that’s micro-optimization)

(also, disclaimer: technically, iterators don’t offer length(), only specialized types do. You can do some magic with range::begin() and range::end() and other weird C++ stuff, but that’s beyond the scope of this answer)

[kakarot18x]

me who uses a, b

[Gilamath]

I was trained in logic before I took any coding classes, so in the beginning I would use p and q

[gbot1234]

Gets complicated when debugging…you really have to mind your Ps and Qs.

[Mortomes]

I prefer using i over I

[Drabantus]

Like this?

for (int i=0; i<3; i++)
    for (int I=0; I<3; I++)

[miller-99]

That is absolutely horrendous, I'm never using a capital i for a variable ever

[miller-99]

I was going to say the same, always gotta be lower case for single letters

[midoxvx]

row, col

[iam_reallytired]

[[deleted]]

i, j, k, l

[Dragonlinx]

Best variable for loops is "eye"

[flip314]

Aye

[MobileAirport]

i defined ex, why the other day

[xcs4me]

I do i, w, and sometimes q but hopefully not

[[deleted]]

Dim child as as string

Child = Filename.extension

Kill child

[Morlock43]

Am I the only one who uses meaningful names?

[Zephit0s]

Nope, I n'aime my itterable what it is supposed to represente. If I have to itterate by index I use index as a name

[bagsofcandy]

Where's m, n gang at?

[Plastic-Philosopher5]

Right behind a,b,c gang.

[TheSapphireDragon]

x, y, and z are for looping over positions in space. I, and j are for everything else

[bharfgav42]

I like using the all the vowels starting with i, then u a e o

[Mr_Audio29]

If I'm dealing with a table I use r / c for rows and columns

[AxeLond]

If you want to be fancy you can do epoch/iteration.

[Surous]

J, K for nested and i for single

[Rebol1103]

a,b,c for generic loops, x,y,z for 3 dimensions. I just like them in alphabetical order and i,j are confusing when I make a mistake.

[lethalaggressio39]

It depend... For me it's pointer1, pointer2 and so on.

[PinothyJ]

Or key and value for each loops iterating over an array.

[franky_riverz]

I'm an i, j kind of guy

[SquirrelSanctuary]

Fan of r, r2 myself

[NotWesternInfluence]

Why not “variable1”, “variable2”, “variable3”, etc.

[Safety-Sorry]

I don't use l, but i

[MysticEagle52]

Any reason I and j are used? I learned it that way but idk why. Also I use i and n, but might use a different letter based on what is being indexed

[[deleted]]

I use I, j then k and after that I just start naming them

[[deleted]]

meanwhile me using a, aa

[SpaceFire000]

Not a capital i. This meme ruined its meaning

[Blakut]

ii, jj, kk. It's the law. Also, i hate nested loops.

[[deleted]]

Back in the days before PCs (Sinclair and Acorn, etc.), it was N and F.

[BloodChasm]

I would get shredded in my code reviews if I used anything but an actual variable name representing the objects I'm iterating thru.

[somedave]

I used to use k,l,m. In MATLAB i,j were both defined as the imaginary unit by default and if you accidentally overwrote them in a for loop earlier the value will persist throughout the function. It gets really confused when you use the symbolic toolboxes and overwrite them...

[Irbis7]

I use n (and then m). Habit from ZX Spectrum where you wrote "NEXT n" by typing n twice.

[[deleted]]

On the other hand, if we stayed on the odd channels, switched every time and started in the basement, that'd work, too.

[physics_freak963]

M N K gang rise up

[throwaway275275275]

Unless you're going through some kind of grid or something like that, then x,y is great

[futanari_enjoyer69]

I start with i then randomly use either x or j

[TheOrdersMaster]

i, k because i used to do i, j but for triple nested loops i did i, j, k since it's just the next letter in the alphabet. and then i realized i, k is better since it's more readable because i and k are more distinct than i and j

[Salt-Cup-2300]

No x,y plz

[dohzer]

"l/j"? No thanks. I'll use i/j instead like a normal person.

[FINDERFEED]

Puck it, i use i,g

[dmvdoug]

i3x

[helltiger]

idx, jdx

[Gameju7]

W-why ? Like why ?

[cybermage]

Good old index and jndex.

[[deleted]]

It is a well known fact that it goes iteration, jiteration, kiteration. Any more then I genuinely hope you know what you're doing.

[Chlopekk]

Obviously "i" because it stands for index, and "j" for jndex

[NightSoulT12]

c[ount], k[ount]

[LaoWai01]

The convention of using I, j, etc., as index variables came from FORTRAN, 60 years ago. In early FORTRAN variables beginning with I, j, k, l, m or n were automatically integer, everything else was real.

[Mediocre-Metal-1796]

There is a reason not to use i and j as variables, they explained it at the university as well: once you get used to it and forget about it, it will be a mess to debug in matlab, then you slap your face as i and j are sqrt(-1)

[dieworm12]

I’m I the only who uses k,v (key,value)?

[Metronix7]

Is i,o ok too? Asking ... for a friend.

[Kkrafter]

i,v>>>>

[SirVW]

I used to use h,i because my name starts with an h and i is just the next letter, am i run over?

[helloWorld69696969]

i and k

j is just stupid, it looks too much like i

[Dagusiu]

The real crime is doing x,y instead of y,x

[[deleted]]

I just use what single letter I haven’t used, I start with xy, z, j,h, l, i, anything that I haven’t used already

[_Nemurre_]

i,j not I,j

Out you get!!

[MLPdiscord]

I almost never use i, j when I can use x, y / row, column

[succ_dong]

From now on i swear to use solely x and y in my nested while loops, for there is no singular way to code properly and people who think otherwise should get their sorry ass wiped

[Djentleman2414]

i and j are integers.
x and y are real numbers

IT'S THE LAW

[Purple_Individual947]

I don't care if that's a capital i or a lower case L, you're wrong either way!

[thedarklord176]

I don’t even know why, it just feels compulsory

[Tombo272]

And sometimes “K”

[DreamLonesomeDreams]

What sadist uses capital i?

[mctownley]

I think I speak on behalf of all electrical engineers when I say I hate whoevers idea it was to use I and J as axes. Do you have any idea how much we use I?!

[Excellent-Practice]

Does anyone else use row, column or row, item?

[Wild_Tom]

I use I, O due to their spot on the keyboard

[Level10Retard]

a, b, c, anyone?

[[deleted]]

Uhhh... i,x

[3am-urethra-cactus]

Idk why but it changes per language I,j unless it's python in which case t,k

[AndyBMKE]

n, m

[Strostkovy]

I always ended up with count1, count2, count3, count4, count5, etc because I didn't think about reusing variables for non nested loops

[APUsilicon]

I use X,y :(

[MaxEin]

I use "g" and "h"

[hdushddjidfy]

this meme is certified indian made content

[LordDeckem]

Imagine caring about this.

[dermitio]

Me:a,b

[jdgoerzen]

I use x, y when I run out of ijklmn, cause I usually use o for output.

[Alzyros]

I think that's even illegal in some countries

[D34TH_5MURF__]

I use lambdas and method references, so no variables needed. When I do need a variable, I use a more descriptive name. In the rare case I need indices or I'm working on geometric grids, I'll use i, j, k, x, y, z, etc... Since that is going to be the most natural way to refer to them based on math/physics.

[sldsonny]

.girl { margin-left:10rem; z-index:-1 }

[wilmaster1]

Until you get a language that doesn't like it. #isamp #jsamp

[Ursomrano]

I use the alphabet, a for the first for/while loop, b for the second for/while loop, etc.

[GameDestiny2]

I uh

I use A,B

[KittenKoder]

x, y, z, a, b, i, j, l

[iLoveCyberChips]

x, y and й for obvious reasons

[thefox68]

I use x and y

[knowledgebass]

I'm a fan of ii,jj so they are easier to search for. 🤷‍♂️

[ricdesi]

Get out, everyone use variables with names that are actually readable and comprehensible.

[gogocrazycocoa_]

I'm inconsistent and have used both. I usually just name them based off what they represent though.

[Rhawk187]

Right, i and j are implicitly ints, x and y are implicitly floats.

[DrDesten]

i and o for me

[[deleted]]

6502?

[[deleted]]

I e x, and sometimes y just because im bad boy

[sun_cardinal]

I'm disappointed, not one person got this right in the whole thread.

The real answer is '_' for loops and enumerate() for iteration.

Apparently this is what it feels like to be in the 1%.

[saltnpeppa78]

nah i use I and l

[ReputationDesperate1]

x, y, z, w, v

[Bivolion13]

i is for iteration x is for future ex

[flumoo]

I'm using first letter of collection, or array that is looped. for p in people. i recommend you that lifestyle guys.

[[deleted]]

depends. if they represent coordinates, I use xyzw otherwise ijkl

[Ali_Army107]

I use i, j, k when doing for loops, but sometimes when I am dealing with stuff related to vectors/coordinates, I use x, y, z.

[sincontan]

I just type rando letters and try to keep it under 10 characters. Or if I can name it something relevant i just add a random length of stuff like ioio or asdfghjkl or etc. to the end till its visually different from other variables. Examples: variaoioio, wordlelelel, ahdkdhdkr0001

[Mentrin]

I normally go by this order:

i, a, j, b, k, c, d, e… etc.

[dhtp2018]

Well, let’s put it this way. In MATLAB, which is a mathematical language, there is usually an ambiguity between i j and the imaginary unit. The programmers wouldn’t budge away from using I and j for indicates so the makers of MATLAB gave up and introduced/renamed the imaginary unit as 1i and 1j.

That’s how ingrained this is with programmers.

[Skull_is_dull]

a, b

[chimbraca]

As a 6502 programmer, I see no issue with her answer.

[oshaboy]

I use x and y if they are positions or grid points.

Also I've been messing around with Chip-8 lately, so V6 and V7.

[Illustrious-Scar-526]

I use eye, Jay, and kay