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My solution: var NotImplemented = (function() { var NotImplemented, err; NotImplemented = (function() { function NotImplemented(message) { var err; err = new Error(message); err.name = "NotImplemented"; this.message = err.message; if (err.stack) You should even skip doing it from most of your utility functions / object methods, just as long as the code that calls them eventually calls .catch(). It doesn't mean the error's not being caught - just that you may not be able to console.log it. The only surefire way to have all browsers display your custom error message is to use an Error object.

The result? Here's an example with two custom parameters: function CustomError(message, param1, param2) { var err = new Error(message); Object.setPrototypeOf(err, CustomError.prototype); err.param1 = param1; err.param2 = param2; return err; } CustomError.prototype = Object.create( And where did they specify and implement .done()? Currently working on Unicorn Standard.

Try it out at http://jsfiddle.net/qcP9y/6/ // returns the name of the function at caller-N // stackFN() = the immediate caller to stackFN // stackFN(0) = the immediate caller to stackFN // try { foo++;  // ReferenceError } catch (exception) { var message = exception.message; // handle the exception } Complex applications can generate a variety of exceptions.  In such cases, the "instanceof" However, the reality is that a number of modern JavaScript environments won't print errors for any of them. Description Use the throw statement to throw an exception.

Clearly, this is suboptimal from a debugging point of view. I removed it. I hear FireFox throws the errors too in newer versions. try { // attempt to execute this code } catch (exception) { // this code handles exceptions } finally { // this code always gets executed } The first part of

Please try again. I would prefer they didn't act that way. up vote 133 down vote favorite 56 For some reason it looks like constructor delegation doesn't work in the following snippet: function NotImplementedError() { Error.apply(this, arguments); } NotImplementedError.prototype = new Error(); About 5 to 15 seconds on my machine.

up vote 261 down vote favorite 58 If I throw a Javascript exception myself (eg, throw "AArrggg"), how can I get the stack trace (in Firebug or otherwise)? share|improve this answer answered Jan 22 at 13:52 Christophe Roussy 4,45212635 add a comment| up vote 0 down vote function: function print_call_stack(err) { var stack = err.stack; console.error(stack); } use case: I’ve tested in both Firefox stable and Firefox Nightly and they behave the same. (Demo: http://jsbin.com/seteto/quiet). Why are unsigned numbers implemented?

Manually regurgitating your errors The obvious way to go about fixing this is to add an extra catch statement to the end of each of your promise chains. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Multiple instanceof statements in a single catch block are just as concise as multiple catch statements-- clean and concise code without any tricks. Reply ↓ Šime Vidas May 31, 2015 at 11:34 pm I’ve tested your code in the console in Firefox Nightly.

Solution for V8 (Chrome / Node.JS), works in Firefox, and can be modified to function mostly correctly in IE. (see end of post) function UserError(message) { this.constructor.prototype.__proto__ = Error.prototype // Make Custom exceptions don't really add much in JavaScript (or probably any untyped language). How to prevent Beamer from repeatedly expanding macros in \frametitle when frame-breaking Friend in front of whom I have badmouthed the company is becoming a colleague Why was the word for asked 7 years ago viewed 42540 times active 2 months ago Linked 167 Custom Exceptions in JavaScript 133 How do I create a custom Error in JavaScript? 39 Extending Error in

throw { type: "validation", message: "Invalid timestamp" } And when you catch the error: catch(e) { if(e.type === "validation") { // handle error } // re-throw, or whatever else } share|improve i guess that's worse.. –B T May 4 '15 at 1:21 add a comment| up vote 0 down vote Another alternative , might not work in all enviroments.Atleast assured it works Why node's console.log and JSON.stringify handle it differently? 5 Custom Javascript Error.toString() 5 How to specify a “caused by” in a JavaScript Error? SyntaxError A syntax error within code inside the eval() function has occurred.

share|improve this answer edited Aug 27 at 10:03 JLRishe 51.7k53671 answered May 16 '09 at 3:51 Kevin Hakanson 24.5k16100134 38 Best answer, but taking Error.prototype directly is probably bad form. Firefox, Opera, and Chrome all call String() on the value that was thrown to display something logical as the error message; Safari and Internet Explorer do not. Once the script has hit your breakpoint, you can look at firebug's stack window: share|improve this answer edited Nov 1 '15 at 16:42 Boann 27.2k76196 answered Feb 26 '09 at 22:58 They are: Error Name Description EvalError An error in the eval() function has occurred.

Browse other questions tagged javascript exception or ask your own question. javascript exception share|improve this question edited Jul 26 '13 at 21:01 B T 14.8k1397123 asked Apr 23 '09 at 22:35 cdleary 27.3k40130178 Does nie instanceof NotImplementedError assertion work after I've just tried pasting a console.log('x') into chrome, firefox, opera and IE (no safari). How?

I've been writing JavaScript for over half my life, and would like to share what I've learned along the way. Unusual keyboard in a picture How to cope with too slow Wi-Fi at hotel? The first problem could be fixed by iterating through all the non-enumerable properties of error using the trick in this answer: Is it possible to get the non-enumerable inherited property names There are no rules prohibiting specific data types: throw { name: "Nicholas" }; throw true; throw 12345; throw new Date(); The only thing to remember is that throwing any value will

if (Console.settings.debug.showInfo && !Console.settings.stackTrace.enabled) { var sFunc = aCurrentLine[0].trim(), sURL = aCurrentLine[1].trim(), sURL = ((!Console.settings.debug.alwaysShowURL && context.location.href == sURL) ? "this page" : sURL), sLine = aCurrentLine[2].trim(), sCol; if (currentBrowser.webkit) sCol Knowing this, some fine people invented the done method, which is functionally equivalent to the above, and can be used just like then, allowing you to write: Promise.resolve('promised value').done(function() { throw Does chilli get milder with cooking? Zakas Tags: Errors JavaScript In my last post, I talked about how and when to throw JavaScript errors.

Ltd. function MyError(message) { this.message = message; this.stack = Error().stack; } MyError.prototype = Object.create(Error.prototype); MyError.prototype.name = "MyError"; –kybernetikos Oct 2 '12 at 10:10 6 I'd add MyError.prototype.constructor = MyError too. –Bharat A Shadowy Encounter With modern technology, is it possible to permanently stay in sunlight, without going into space? Friend in front of whom I have badmouthed the company is becoming a colleague Can Communism become a stable economic strategy?

Also, notice with NotImplementedError2, when I don't set the .name explicitly, it is equal to "Error". posted in ES6, Javascript on May 29, 2015 by James K Nelson This article has kindly been turned into a video by the folks at Webucator who do JavaScript training. Only figured it our by eliminating lines of code in files, file by file.... It can start to be unwieldy after a while,...View JavaScript JavaScriptMatt Ruby, 4 days agoHow to Manage Your JavaScript Application State with MobXKeeping your UI in sync can be tricky.

Good Term For "Mild" Error (Software) A better way to evaluate a certain determinant Is it appropriate to tell my coworker my mom passed away? The common way to do this is demonstrated below. If you make an edit I will happily undo the downvote. But, you don't have to type that after every .then().

throw {name : "NotImplementedError", message : "too lazy to implement"}; Edit based on comments After looking at the comments and trying to remember why I would assign prototype to Error.prototype instead Isn't that more expensive than an elevated system? You don't want to know about links of that chain. share|improve this answer edited Oct 29 '14 at 17:42 answered May 2 '14 at 20:44 Jonathan Benn 41939 This fails in the case m = new InvalidInputError(); dontThrowMeYet(m); –Eric

Reply ↓ Josh May 29, 2015 at 10:51 pm In your async-becomes-sync example, you could have left the original code structure. Using done, the code would look something like: getSomethingViaHttp() .then(function(result) { // processResultAsync returns another promise return processResultAsync(result); }) .done(function(processed) { showResult(processed); }); But then what happens when my processing library's TypeError Creates an instance representing an error that occurs when a variable or parameter is not of a valid type. StorageError = BaseError "Storage" SignatureError = BaseError "Signature" For fun, you could now define a function that throws a SignatureError if it is called with too many args.