Variables

• Use const unless mutability is necessary, in which case var and let are permissible
• Use camelCase naming for local variables
• Use MACRO_CASE for naming constants
• NO MAGIC NUMBERS

String literals

• Use double quotes instead of single quotes for String primitives

Functions

• Use lambda expressions instead of functions unless necessary
• Use ES6 arrow functions instead of the function keyword

// prefer this
const bar = (foo) => {  
  return 0;
};

// over this
function baz(foo) {
  return 0;
}

Semicolons

• End all statements that can end with semicolons with semicolons.

Indentation

• Use two spaces for indentation

Functions () and {}

if () {
  // etc
}

Miscellaneous

// have one space between operators and operands
const a = 1 + 3 * sqrt(4);

// start the else on a new line
// add spaces between keywords and the open parenthesis
if (true) {
  // don't add a space between the identifier and the open parenthesis
  bar();
}
else {
  baz();
}