General code style

Clarity

You have to make sure it is easy for other people to read your code,for example:

// This code is bad because others won't know what btn1 does.
Button btn1 = new Button();

// This code is good because others will know that buttonLogin is for login action.
Button buttonLogin = new Button();

// This code is misleading because it looks like both statements
// are inside the conditional.
if (condition)
  firstStatement();
  secondStatement();

// Much clearer!
if (condition) {
  firstStatement();
}

secondStatement();

Language specific code styles

PHP

Objective-C

Java

JavaScript

EJS

HTML

Css

Stylus

Markdown

One empty line above the title(#,##,##…).

Use pre instead of images to show diagrams.For instance:

   |                            |                    |
---|--> Third party libraries --|--> Encapsulation --|---> Project
   |                            |                    |

OS specific code styles

Windows

macOS

Linux

Platform specific code styles

Windows

iOS

Android