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

You can do this:

this.hasWheels = hasWheels !== false;

That gets you a true value except when hasWheels is explicitly false. (Other falsy values, including null and undefined, will result in true, which I think is what you want.)