Douglas Crockford's preferred Javascript object constructor pattern, from https://www.youtube.com/watch?v=bo36MrBfTk4 (starting at 35:45)

crockford_object_creation_pattern.js

// The pattern Crockford uses these days.
function constructor(spec) {
  var that = other_constructor(spec),
      member,
      method = function () {
        // spec, member, method
      }
  that.method = method;
  return that;
}

example_object_creation.js

// An implementation of the pattern that I wrote to understand how to use it
function constructor(spec) {
    var that = spec,
        member = 1.0,
        method = function () {
            console.log(["This is spec = ", spec].join(""));
            console.log(["This is member = ", spec.member].join(""));
        };
    that.method = method;
    return that;
}

var module = constructor({member: 2.0, toString: function() {return "My groovy spec object";}});
module.method();