Tabs v Spaces...
camelCase v snake_case
'single' vs "double"
hyphen-vs_undescore

The point here is PICK ONE AND USE IT.

2 tab space vs 4 tab space

@youness
This rant isn't arguing on which one to use. It's purely about people who switch between and leave you wondering if the file is my_file or my-file, or if the method you want is myMethod or my_method.

Most IDEs are smart enough to pick up tabs/spaces.

I could also complain about LF vs CRLF.

The config file I'm working on right now(pulled from a nameless GitHub) is such a mess of tabs and spaces. Thankfully the Sublime Text "reindent" command fixed most of it.

I don't care what you choose as long as it's consistent. for me personally I use 2 spaces, lowerCamelCase, LF only (I work in Linux), and code blocks like so:
function() {
//no comment
}
also I hate all the extra spaces so I do: [1, 2, 3] vs [ 1, 2, 3 ]....

and....

grunt vs gulp
express vs hapi

This list can just go on forever... (Yeah, I'm looking at you, Python)

I'd love to see people try and fail to use camel case in common lisp. Gotta love case insensitivity

dependsOn_the-context

but when it doesn't matter, I usually prefer camelCase

@ElectricCoffee
Or snake_case in Golang ;)

@xorith snake case in c and c++ if you actually bother to follow the style guide used in the standard library... Which nobody seems to do