Question

Setting default values is one of my favourite things to do when creating JavaScript applications. While working, i came across a bug that could have easily escaped me.

This is how the object is used.

var obj = new App({
             imgs: [];
             preload: false
          });

This is how the object is defined.

var App = function(o) {

    this.imageFolder = o.imgs;

    this.preload = o.preload || true; // the idea is to set a default value of true

    if(this.preload) {

     // preload images here    

   }

}

My question is, how do you handle boolean values when using the || operator

Answer 1

this.preload = "preload" in o ? o.preload : true;