How to set default boolean values in JavaScript?

Question

Setting default optional values in JavaScript is usually done via the || character

var Car = function(color) {
  this.color = color || \'blue\';
};
         


        

Answer 1

How about:

this.hasWheels = (typeof hasWheels !== 'undefined') ? hasWheels : true;

Your other option is:

this.hasWheels = arguments.length > 0 ? hasWheels : true;