Errors

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

• Filename and LineNumber default

• .name is Error default but there are more

• .stack is call stack that most envs give

New and just Error are same

Usage

try {
  throw new Error("Parameter is not a number!");
  //throw new Error([message[, fileName[, lineNumber]]])
}
catch(err) {
    alert(e.message); // This is an error
} finally { //can just have the finally if you dont want to catch error?
  //do something regardless of result
}

Error has name, message and can have custom info/code

could technically throw and catch anything

Custom Errors

export class MediaError extends Error {
  //without constructor will include this class in stack trace
  constructor(message, user_message, err) {
    super(message);
    this.name = "MediaError";
    this.user_message = user_message;
    if (Error.captureStackTrace !== undefined) {
      //Firefox problem, since its non-standard
      Error.captureStackTrace(this, MediaError);
    }
  }
}

Common Custom Errors

Axios

err.response

HTTP

Check out http-errors Node package or HTTP Fundamentals