Example of exception handling

jsbin.mabuw.js

var test = null;

function NumberException(message){
  this.name = 'NumberException';
  this.message = message
}

function isPositiveNumber(num) {
  if (typeof num !== 'number') 
    throw new NumberException('Value entered is not a number');
  
  return num > 0 ? true:false;
}

(function(){
  var result;
  try {
    result = isPositiveNumber(test);
  } catch(e){
    console.log('exception: ' + e.message);
  }
  
  console.log('result: ', result);
})();