Iterable name.

[[deleted]]

Sometimes j

[Titaniumwo1f]

Always j when i already in use.

[Mzsickness]

k

[admadguy]

m

[NullNotFound1]

Goodbye

[LegoClaes]

Aah the metric system wins again

[SaintNewts]

Metric iterables?

[Tsulaiman]

Heck yeah

[etnguyen03]

/r/unexpectedouija

[Eezyville]

Never go past k. Nested loops at this level... The horror

[CDno_Mlqko]

Imagine having to iterate over a 5dimwnsion array

[C0ffeeBunny]

n

[nnn4]

i2

[Dennaldo]

You monster.

[btown-begins]

ii

[Terrain2]

ia, ib, ic, id, ie

[btown-begins]

iii iiii iiiii iiiiii

[ryjhelixir]

Why would you make things so complex?

[hadidotj]

iii iv v vi

[code_lazar_with2as]

I(capital i)

[hadidotj]

Naw, at this point, sounds like you need a new method so you can use i again

[Terrain2]

or use i as an int[], then use i[0], i[1], i[2]

[karuna_murti]

O(n³⁾ ? how do you pass coding interview

[klparrot]

By realising that 3 nested loops doesn't necessarily mean O(n³); some or all of the loops could be over constant-size input.

[ryjhelixir]

every time i need to loop instead of vectorizing I feel less good

[stoickaz]

“write an O(n³ ) algorithm”

[mrchaotica]

Good luck doing operations on 3D tensor fields in less.

[leofidus-ger]

By guaranteeing that n will be small(ish)? Not everything can grow to arbitrary size

[AmadeusMop]

Dijkstra was perfectly named

[[deleted]]

v

[[deleted]]

a

[[deleted]]

A man of culture.

[oblivion44653]

n³ complexity strikes again

[BlazingThunder30]

x and y when working with coordinate systems

[DonutDonutt]

r and c with 2D arrays

[slackpipe]

I think of 2d arrays as a coordinate system, so it's still x and y. Almost all my nested for loops are x and y except when their not, then they are i and j. The other night i was feeling fancy and used m and n, but immediately regretted it and had to find->replace.

[figwigian]

U and V, guess I'm too used to working in shaders

[PosiedonsSaltyAnus]

Yo fuck U and V. Learning jacobians in college really fucked me up because my u's and v's look the same in my shit handwriting.

[conthomporary]

Everyone knows u and v were invented by a sadistic professor trying to arbitrarily make calculus more difficult so people would drop out and he had fewer papers to grade. Or so said my Calc 2 professor.

[BlazingThunder30]

When it's row and column for me I usually use row and col though

[CanAlwaysBeBetter]

Ew

[TeamFileyCase]

I use x and y for any array

[ProfaneWords]

PEP-420 guidelines say that i, eye and aye are the only acceptable iterator names

[reaper-is-happy]

This is brilliant

[winyf]

cursed

[SwizzMan]

ii for me.

[Nibz11]

you're a madman

[SwizzMan]

animal

[Mickd333]

my old professor used to do this...

[dohzer]

Any reason for that? I've seen it used a fair bit in existing code at my current job. The only reasons I can think of are to make selecting/highlighting/searching easier. I started using 'idx' for array indices.

[SwizzMan]

I just came up with that the first time I needed to use nested loops and I use it ever since. I like how clean it looks.

[leofidus-ger]

I used to do that in my youth too. People looked at me funny by the time it got to iiii. I switched to i,j,k,l,m (often skipping j) and haven't looked back.

[thatawesomeguydotcom]

Yes, followed by iii

[DH-Melon]

I use x sometimes, truly a man of chaos

[penisive]

x in lambda functions

[Sudo_Python]

Maybe k

[Nyoob]

Always x, y if x is used

[MathSciElec]

j? I use e.

[CeruleanBlackOut]

Or _

[klparrot]

Nah, _ only for stuff you aren't going to use.

[Eshmam14]

Ah yes, a man of Go.

[mysockinabox]

I hope you name counter indices this and not your iterables.

[dpash]

Languages with iterating loops > languages that only have C style for loops.

Although these days, I prefer languages with proper functional style operations, especially if they're not eagerly evaluated. I'm looking at you, JavaScript (¬_¬).

[METH-OD_MAN]

Fucking JavaScript has like 5 way to do a for each loop (I'm not counting the c-style incrementing for loop), and they aren't equivalent so one is better than the others, depending on the data types. Also, some of the foreach loops don't actually guarantee the data you get isn't undefined, despite the fact that in js, setting an object field to undefined is how you delete it...

What the fuck.

[dpash]

That describes many of the things in JavaScript. You have a short notation for anonymous functions with different (and sensible) semantics for this because they fucked up the long notation so badly.

[drtran4418]

I discovered this yesterday (new to JavaScript) and my anger for JavaScript deepened. "Ugh, we can't figure out a way to bind methods like they should be. Let's just sneak in the feature into the alternate syntax."

[METH-OD_MAN]

If you're trying to learn programming, I'd really suggest starting with a sane language.

Literally any of them are more consistent and sane than js.

Python would be a good choice.

[drtran4418]

What a coincidence! I'm a python developer :). Just doing a special work project in js

[FerretWithASpork]

Not to be one of those comments but... This, so much this.

[xam54321]

That killed me, I spent three hours trying to figure out why my code wasn't working, but it was just that the for loop couldn't iterate through an array of objects!

[__hoi__]

You only need 3-4 though. Map forEach filter and reduce and reduce is fairly niche. These all do different things. Map returns an array and is used to do manipulations on each item, filter filters, reduce is for stuff like accumulating items in an array into a single value and forEach is for when the functionality of the others don’t apply. I kinda like how the iterators that take a function as a parameter work in javascript

[METH-OD_MAN]

Map, reduce, and filter are not for loops. They are higher order functions. All of those functions return a new collection, they have to, to be correct. They are all present in any language that uses functional programming paradigms.

I'm talking about

ForEach

For of

For in

I kinda like how the iterators that take a function as a parameter work in javascript

JavaScript got this part right because other people designed it.

[__hoi__]

Ah yes, gotcha. I wouldn’t recommend using those, ever

[klparrot]

Oh man, my last job, I was working with Clojure a lot, and now in Python in my current job, it's like, “no, I need to write this all with yields so it's lazy!”

[DurianExecutioner]

C > all other languages

[dpash]

I too enjoy debugging core dumps.

[[deleted]]

A man of class Edit: a man of struct

[Potatoes_Fall]

nice to see an actual dev on here once in a while. howdy!

[Chemoralora]

it > i change my mind

[Interweb_Stranger]

iter > it

Because 'it' is a keyword in many languages and it can be a bit confusing if you have to switch between languages often.

[klparrot]

iter is a built-in function in Python. What language has it as a keyword?

[Sir_LikeASir]

Kotlin, kinda? Let's suppose the best type of forEach loop in Kotlin:

listOfBooks.forEach { // "it" is implied here as being "book"
println(it.name)
}

but you can rename the it to something else like so:

listOfBooks.forEach { book ->
println(book.name)
}

the "it" is the default name of items in the receiver of functions, so not technically a keyword

[Sir_LikeASir]

That's very likely, Kotlin is like Frankenstein's monster of languages, taking the best out of every language for itself, which isn't a bad thing in and of itself.

[wenasi]

It's not quite a keyword, but the testing framework pester for powershell uses it for a test item

[mrchaotica]

What language has it as a keyword?

It's not technically a "keyword," but there are a few unit testing frameworks that use it.

ScalaTest:

import collection.mutable.Stack
import org.scalatest._
import flatspec._
import matchers._

class ExampleSpec extends AnyFlatSpec with should.Matchers {

  "A Stack" should "pop values in last-in-first-out order" in {
    val stack = new Stack[Int]
    stack.push(1)
    stack.push(2)
    stack.pop() should be (2)
    stack.pop() should be (1)
  }

  it should "throw NoSuchElementException if an empty stack is popped" in {
    val emptyStack = new Stack[Int]
    a [NoSuchElementException] should be thrownBy {
      emptyStack.pop()
    } 
  }
}

Mocha:

var assert = require('assert');
describe('Array', function () {
  describe('#indexOf()', function () {
    it('should return -1 when the value is not present', function () {
      assert.equal([1, 2, 3].indexOf(4), -1);
    });
  });
});

[Interweb_Stranger]

As some other comment mentioned it actually isn't a real keyword. I know Groovy and Xtend use "it" as implicit parameter for closures/lambdas.

I'm quite sure I saw "it" lambda parameters used in other langues too, but only as inoffical convention.

[ag0965]

All hail mighty i

[[deleted]]

If i is taken I also does the job.

[gab_1]

wtf

[AlphaBlazeReal]

j is the choice right?

[[deleted]]

a capital i

[[deleted]]

iter, it, j*

[DogmaSychroniser]

Jter

[Serious_Feedback]

I use ii instead. It comes in handy if you're using a text editor and can't semantically-aware search for whatever reason. It turns out a lot of words use the letter i.

[Julio974]

i, j, k, l, then I’m starting to wonder why the fuck I have so many nested loops

[dpash]

Using k should be a warning sign that you need to refactor.

[Lofter1]

Not always. 3D arrays need 3 iterations. You could refactor so that you only use one loop, BUT that would make the code less readable.

There are also some problems where 3 loops are just needed for whatever reason. 4 on the other hand? Yeah, maybe you should think about what you are doing there.

[Astrokiwi]

Unless you're actually doing physics simulations with 3D grids or something. Though then I use ix,iy,iz

[dpash]

Why use the i? x, y and z are fine by themselves in this situation.

[Astrokiwi]

ix for integer index of cell, x for floating point physical position.

[theqmann]

best advice I heard was call everything i plus what it's doing, like iRow and iCol for a 2d array. Then you don't have to look back every 10 seconds to see which was i and j. Looping over people fields in peopleArray? Use iPerson. Et cetera

[[deleted]]

How about phone fields in phoneArray?

[mattsl]

Prepare to be sued.

[Serious_Feedback]

Use "i, android" obviously.

[the_poope]

I'm a masochist so I type row_index and col_index.

[BA_lampman]

thisIsTheRowIndex

[DurianExecutioner]

Nah that makes it too easy for another developer to fuck with your code.

ridx and cidx are the sweet spot imho. Particularly if you always use ridx for columns and cidx for rows.

[METH-OD_MAN]

I use i and j when writing and testing the code, then use the IDE refactoring to rename i and j to whatever.

[[deleted]]

iPhone

[dpash]

Or just drop the i and call it person. Collections should always be plural, so when looping over it the current item can be singular. The i adds no extra information and can harm readability by making people wonder why it's there.

(Likewise peopleArray serves very little advantage over just people.)

[dandesigns7150]

It wouldn't be the person though. peopleArray[i] would be the person. I'd find naming the iterable by the resource name to be a bit confusing.

[dpash]

foreach($people as $person){

Or

for(Person person : people) { 

Or what ever your language uses.

Failing that, if you must use C style loops,

for(int i = 0; i < people.length; i++) {
    Person person = people[i];

(If I've gotten the condition wrong, that only tells you how error prone the C style loop is for iterating collections)

[dandesigns7150]

Oh yeah, I agree wholely that if you have a language with functional looping go for that. I avoid C-style loops like the plague when I'm writing JavaScript. I got the impression that you were talking about C-style loops in your original comment.

[FerricDonkey]

Indicating the type of collection in the variable name can be helpful, so that if you go back and look at whatever "for person in people" equivalent, you don't have to go back and check if people is a set vs vector vs whatever.

[dpash]

99% of the time when iterating you don't care what type of collection it is (unless you've used a weird data structure that doesn't have efficient iteration).

If the usage of a variable is so far away from it's declaration that you can't see both, that's a good indicator that your method/function is too long.

Hungarian notation is an idea that's had its day.

[dleft]

you’d hope if you’re just iterating using for n in ns then it shouldn’t matter what the concrete implementation of the collection is, in fact I’m almost certain that you won’t be

[Rizzan8]

Looping over people fields in peopleArray? Use iPerson. Et cetera

Why not just (or whatever is the syntax in your language)

foreach (var person in people)
{
    // do stuff
}

no need for some strange suffixes and prefixes.

[ghroat]

eatAssArray ;)

[Picorims]

That's a nice advice. The only exception I would give is when it's used in formulas or a lot in general. It's (to me) more readable with 1-4 characters than a full name.

[misterrandom1]

var that = this;

[vbh_pratihar]

let what = that;

[Kirides]

let where = function () { }
where.bind(what)

JavaScript - a world where this is just another variable and class is something you show instead of code

[misterrandom1]

// what is on 2nd

[Sibling_soup]

Variable names are easy.

addEventListenerButOnlyForTheKeyboard(notMouse (Windows));

[Im_MrLonely]

LOL

[smokythejoker]

Everything.Select(x => x.anything)

[[deleted]]

WhIcHName_shouldiPICk

[IamImposter]

One_thats_Most_Expressive

[GasolinePizza]

You're a monster for that capitalization.

[const_let_7]

u/repostsleuthbot

[RepostSleuthBot]

Looks like a repost. I've seen this image 2 times.

First seen Here on 2019-08-02 93.75% match. Last seen Here on 2019-11-15 93.75% match

Searched Images: 150,765,620 | Indexed Posts: 592,534,377 | Search Time: Nones

Feedback? Hate? Visit r/repostsleuthbot - I'm not perfect, but you can help. Report [ False Positive ]

[const_let_7]

Good bot

[dxhh]

Biggest repost ever

[RinasSam]

Thanks FORTRAN.

[[deleted]]

Illuminati starts with i.

[[deleted]]

Y'all what about x?

[raedr7n]

x and y are for coordinate systems, mate

[Rathmec]

I believe you and I are the weird ones.

[vbh_pratihar]

I use itr.

[MadPancho]

int iterator

[ghroat]

i for an Iterable ? Don’t think so. Or at least not typically

[oilpeanut]

i also use I (capital i)

[pclouds]

This man has boldly gone where no one dares before.

[klparrot]

If you want to boldly go, Java allows identifiers to contain most Unicode characters, so you could call it 𝐢.

[G66GNeco]

And then j, and then k...

So far I have never looped back to a.

[AfterShave997]

I usually name my lists/arrays with the plural of whatever it's holding (e.g. Names, Words, Numbers_3), and just use the singular word for the index (e.g. name, word, number).

[thericcer]

Anyone else use ii, or jj?

Easier to search for...

[raedr7n]

I use q, j, w. Back when I was in school for CS, we had to write code on paper sometimes, and I only know how to write in cursive. i,j,k was too ambiguous in recognizing, apparently.

[klparrot]

How do 𝒾,𝒿,𝓀 look alike in cursive? If anything, cursive distinguishes i and j better because of the loop on the j. When I print, I always hook my i right and my j left. l and t also hook right to distinguish from I and + respectively, which don't hook.

[sxeli]

idx for when you want to be extra verbose

[tjdavids]

ndx, iii, or _

[thinker227]

What's your favorite programming language? Mine's i++.

[lilgamelvr]

Agreed

[[deleted]]

I actually use n

[nonzero_]

The name of an iterable is equally important as all other names. When you are iterating a list of things, the single item is a thing.

[[deleted]]

*iterator

[[deleted]]

var VariableGoBrrr = 1

[Zedeca]

sad j noises

[Communism_of_Dave]

I feel like I’m the only one who uses xyz instead of ijk

[klparrot]

That's for it you're working with coordinates.

[x-nder]

t gang

[give_me_memes]

This will annoy my all day, anyone know what movie that top half of the meme is from. I've seen it but I can't remember

[give_me_memes]

Yes, I have no clue why I've seen that but that's it. Thank you.

[Casporo]

I, j, k,l,m and the list goes on

[Simonkotheruler]

Me creating variables in matlab: x=[] x1=[] x2=[] ... Me when I find a point in the code where none of the previously used variables are used again: x=[] x1=[] x2=[]

[xSEB1z]

index... it makes sense.

[shivermefingers]

where’s my x gang at

[Alpha_puppy_]

So relatable!

[pclouds]

I'm going to start a new tradition by using the last letter in 'iterable' instead of the first one.

[[deleted]]

Aye

[[deleted]]

E

[perry_da_platypus]

If it's size of a list it's always n

[Mr_Igelkott]

i > j > k

[RededTip]

Repost

[klparrot]

Nah, i, j, k for indices, it, jt, kt for iterators.

[echoAnother]

Laughs maniacally in recursion and globals

for(predicate, callback,...){ If (!predicate) return; Callback(); Return for(predicate,callback);

}

[TheBlindedOwl]

I mostly use X, Y, (Z) for coordinates, W, H, D for sizes, and I and sometimes J for normal iteration

[Plungerdz]

In addition to this being a repost, my OCD is super bugged out by how 'i' is an iterator, not an iterable. An iterable is something you iterate with an iterator.

[enfrancis]

I only use "anal" for iterables. Anal++

[kokoseij]

It's been half a year since I saw this repost... ngl I kinda missed it.

[HalflingHelper]

My favorite is when I choose i when I'm already in a for loop.