What is the purpose of Error object

The Error constructor creates an error object and the instances of error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. The syntax of error object would be as below,

  new Error([message[, fileName[, lineNumber]]])

You can throw user defined exceptions or errors using Error object in try...catch block as below,

  try {
    if (withdraw > balance)
      throw new Error("Oops! You don't have enough balance");
  } catch (e) {
    console.log(e.name + ": " + e.message);
  }