How to access the value of an object from inside a method of the same object in Javascript?

Question

I'm trying to add a toBool() "method" inside the Object object using prototype... something like this:

Object.prototype.toBool = function ()
{
 switch(this.toLowerCase())
 {
  case "true": case "yes": case "1": return true;
  case "false": case "no": case "0": case null: return false;
  default: return Boolean(string);
 }
}

var intAmount = 1;
if(intAmount.toBool()) 

But I'm having an issue trying to access the value of the object from inside the same object method this.toLowerCase()

How should it be done?

Answer 1

Your code doesn't work because toLowerCase() is a method of String, but not of Number. So, when you try to call toLowerCase() on the number 1, it doesn't work. A solution would be just to convert the number to string first:

Object.prototype.toBool = function ()
{
 switch(String(this).toLowerCase())
 {
  case "true": case "yes": case "1": return true;
  case "false": case "no": case "0": case null: return false;
  default: return Boolean(string);
 }
}