Throw better errors about js-quantities HOT 2 CLOSED

function QtyError() {
  var err = Error.apply(this, arguments);
  this.name = 'QtyError';
  this.message = err.message;
  this.stack = err.stack;
}
QtyError.prototype = Object.create(Error.prototype, {constructor: { value: QtyError }});

try {
  .... // Something throwing QtyError instances
}
catch(e) {
  if(e instanceof QtyError) {
    ....
  }
}