1. Start Here
   1. Introduction
2. Guidelines
   1. White Space
   2. Indentation
   3. Line Wrapping
   4. Methods & Side Effects
   5. Code Blocks
   6. Anonymous Code Blocks
   7. Dots versus Spaces
   8. Files
3. Reference
   1. Scala
   2. Bizo
   3. Official Scala Style Guide
4. 

White Space [Edit]

1. Spaces over Tabs
2. Trailing whitespace
3. Spaces around arguments and operators

Spaces over Tabs

No tabs, ever.

If you need to clean up a codebase with tabs, you can type the following which converts all tab occurences to 2 spaces:

% find . -name "*.scala" | xargs sed -i 's/\t/  /'

Trailing whitespace

Try to leave no trailing whitespace behind.

If you need help cleaning a codebase, type the following which strips all trailing whitespace (spaces, tabs):

% find . -name "*.scala" | xargs sed -i 's/[ \t]*$//'

Spaces around arguments and operators

One space after commas

// wrong: missing space after comma
def foo(a:Any,b:Ref) = ...

// wrong: extra space before comma
def foo(a:Any ,b:Ref) = ...

// right
def foo(a: Any, b: Ref) = ...

One space after colon

// wrong: missing space after colon
def foo(a:Any,b:Ref) = ...

// wrong: extra space before colon
def foo(a:Any,b :Ref) = ...

// right
def foo(a: Any, b: Ref) = ...

Spaces around operators

// wrong: missing spaces around operator
val x = 1+1

// right
val x = 1 + 1

No spaces after parenthesis

// wrong
val threads = 10 + ( Runtime.getRuntime.availableProcessors * 4 )

// right
val threads = 10 + (Runtime.getRuntime.availableProcessors * 4)

// right
if (options.has("?") || options.has("h")) {
  parser.printHelpOn(System.out)
  System.exit(-1)
}