Coding standard for:

C++
C#
Java
Python
Rust
R
JavaScript
Scala

Style Guide of Common Languages

## Code Layout
Continuation lines should align wrapped elements either vertically using Python's implicit line joining inside parentheses, brackets, and braces, or using a hanging indent. When using a hanging indent the following should be considered:

1. There should be no arguments on the first line.
2. Indentation should be used to clearly distinguish itself as a continuation line.



# Aligned with opening delimiter.

foo = long_function_name(var_one, var_two,
                         var_three, var_four)


# Add 4 spaces (an extra level of indentation) to distinguish arguments from the rest.

def long_function_name(
        var_one, var_two, var_three,
        var_four):
    print(var_one)


### Hanging Indents

When there are many parameters:

# Hanging indents should add a level.

foo = long_function_name(
    var_one, var_two,
    var_three, var_four)
    

## Tabs or Spaces?

* Spaces are the preferred indentation method.

* Tabs should be used solely to remain consistent with code that is already indented with tabs.

* Python 3 disallows mixing the use of tabs and spaces for indentation.

## Maximum Line Length

* There should be no more than **79** characters in a single line.
* Try to avoid scrolling the widget horizontally.

## Should a Line Break Before or After a Binary Operator?

No, operators sit far away from their operands.

# Easy to match operators with operands

income = (x
          + y
          - z)

## Blank Lines

* Top-level function and class definitions should follow two blank lines.

* Method definitions inside a class are surrounded by a single blank line.

* Extra blank lines may be used to separate groups of related functions. Blank lines may be omitted between a bunch of related one-liners.

* Use blank lines in functions, sparingly, to indicate logical sections.

## Imports
Imports should usually be on separate lines:

# Code Layout
Continuation lines should align wrapped elements either vertically using Python's implicit line joining inside parentheses, brackets, and braces, or using a hanging indent. When using a hanging indent the following should be considered:

1. There should be no arguments on the first line.
2. Indentation should be used to clearly distinguish itself as a continuation line.



## Hanging Indents

When there are many parameters:

# Tabs or Spaces?

* Spaces are the preferred indentation method.

* Tabs should be used solely to remain consistent with code that is already indented with tabs.

* Python 3 disallows mixing the use of tabs and spaces for indentation.

# Maximum Line Length

* There should be no more than **79** characters in a single line.
* Try to avoid scrolling the widget horizontally.

# Should a Line Break Before or After a Binary Operator?

No, operators sit far away from their operands.

# Blank Lines

* Top-level function and class definitions should follow two blank lines.

* Method definitions inside a class are surrounded by a single blank line.

* Extra blank lines may be used to separate groups of related functions. Blank lines may be omitted between a bunch of related one-liners.

* Use blank lines in functions, sparingly, to indicate logical sections.

# Imports
Imports should usually be on separate lines:

This lesson guides you how to indent code in Python.

Style Guide for Python

Style Guide for Java

Style Guide for PHP

Style Guide for JavaScript

Style Guide for R

Style Guide for C++

Style Guide for C#

Style Guide for Rust

Style Guide for Scala

Indentation

Code Layout

Aligned with Opening Delimiter

Add 4 Spaces

Hanging Indents

Tabs or Spaces?

Maximum Line Length

Should a Line Break Before or After a Binary Operator?

Blank Lines

Imports