js.md

General

Indentation - 4 spaces (do not use tabs)
Avoid lines longer than 80 characters.
Required License in File Header

Naming

class - UpperCamelCase
functions - lowerCamelCase (preferrably verbs)
variables - lower_case_with_underscores (preferrably nouns)
constants - ALL_UPPER_CASE_WITH_UNDERSCORES

Classes

The standard way of creating classes is the following. Please note that by class we mean an object that is class-like. Also, note the naming of all anonymous functions.

var ClassName = (function ClassNameClosure() {
  function ClassName(...) {
    ...
  }

  ClassName.prototype = {
    functionName: function ClassName_functionName(...) {
      ...
    }
  };

  return ClassName;
})();

Variables

Declare a variable before it is used
This helps identify undeclared variables that may become implied globals. Implied global variables should never be used.
var statements should be the first statements in the function body
Give each var variables it's own line and comment
list them in alphabetical order
Use of global variables should be minimized.

var currentEntry; // currently selected table entry
var level;        // indentation level
var size;         // size of table

Braces

Always use braces and put them on same line even for single line control statements

if (someVar) {
  return true;
} else {
  return null;
}

Note: This wasn't always followed, but any new code should do this.

White Space

Space after control statements (if, else, while, for, ...)

if (someVar) {

Equalities

Use only strict equalities (and inequalities) in control statements, e.g.

if (someVar === conditionA) {
  return true;
} else if (someVar !== conditionB) {
  return false;
}

Note: This wasn't always followed, but any new code should do this.

Comments

Liberally comment your code.
But avoid redundant comments e.g.

i = 0; // Set i to zero.

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