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From JavaScript to Ruby: Style Guide

20 April 2015 — Josh Beam — javascript ruby

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This post is the second in the series of “From JavaScript to Ruby”, which is aimed at helping JavaScript developers transition their thinking from JavaScript to Ruby. Here you’ll find a table of the ways we do things in JavaScript, and the way you’re supposed to do them in Ruby.

Style Guide

This post is a living document. Expect changes as necessary. Suggestions? Leave a comment below or email Josh.

Last updated: Apr 20, 2015

If you do this in JavaScript...
Airbnb 		...do it like this in Ruby
bbatsov
String quotes
'Some string' 'Some string'
String concatenation 
var world = 'world!',
    helloWorld = 'hello ' + world;
 
world = 'world'
hello_world = "hello #{world}"
Variable names
camelCaseVariable = true camel_case_variable = false
Tabs 
function foo() {
    // 'hard tab', 4 spaces
}
 
def foo
  # 'soft tab', 2 spaces
end
Callbacks 
function someFunction(cb) {
  var hello = 'hello';

  if(typeof cb !== 'undefined') {
    return cb.call(this, hello);
  }
}

someFunction(function (h) {
  return h;
});
 
def someMethod
  hello = 'hello'
  yield(hello) if block_given?
end

someMethod do |h|
  h
end

# or

someMethod { |h| h }
Talking about methods
someClass.someMethod SomeClass#some_method
Comments
// single-line comment 
/*
  multi-line
  comment
*/
 # single-line comment 
# multi-line
# comment