Error Description In Javascript
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object. 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. See below for standard built-in error types. Syntax new Error([message[, fileName[, lineNumber]]]) Parameters message Optional. Human-readable description of the error. fileName Optional. The value for the fileName property on the created Error object. Defaults to the name of the file containing the code that called the Error() constructor. lineNumber Optional. The value for the lineNumber property on the created Error object. Defaults to the line number containing the Error() constructor invocation. Description Runtime errors result in new Error objects being created and thrown. This page documents the use of the Error object itself and its use as a constructor function. For a list of properties and methods inherited by Error instances, see Error.prototype. Error types Besides the generic Error constructor, there are six other core error constructors in JavaScript. For client-side exceptions, see Exception Handling Statements. EvalError Creates an instance representing an error that occurs regarding the global function eval(). InternalError Creates an instance representing an error that occurs when an internal er
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Imagine Microsoft Student Partners ISV Startups TechRewards Events Community javascript error message popup Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content what is error Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. JavaScript Language Reference JavaScript Reference https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error JavaScript Objects JavaScript Objects Error Object Error Object Error Object ActiveXObject Object Array Object ArrayBuffer Object arguments Object Boolean Object DataView Object Date Object Debug Object Enumerator Object Error Object constructor Property (Error) prototype Property (Error) description Property (Error) message Property (Error) name Property https://msdn.microsoft.com/en-us/library/dww52sbt(v=vs.94).aspx (Error) number Property (Error) stack Property (Error) stackTraceLimit Property (Error) toString Method (Error) valueOf Method (Error) Float32Array Object Float64Array Object Function Object Global Object Int8Array Object Int16Array Object Int32Array Object Intl.Collator Object Intl.DateTimeFormat Object Intl.NumberFormat Object JSON Object Map Object Math Object Number Object Object Object Promise Object Proxy Object Reflect Object RegExp Object Regular Expression Object Set Object String Object Symbol Object Uint8Array Object Uint8ClampedArray Object Uint16Array Object Uint32Array Object VBArray Object WeakMap Object WeakSet Object WinRTError Object TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Error Object (JavaScript) Contains information about errors.Syntax Copy errorObj = new Error() errorObj = new Error([number]) errorObj = new Error([number[, description]]) Par
Syntax Javascript - Enabling Javascript - Placement Javascript - Variables Javascript - Operators Javascript - If...Else Javascript - Switch Case Javascript - While Loop https://www.tutorialspoint.com/javascript/javascript_error_handling.htm Javascript - For Loop Javascript - For...in Javascript - Loop Control Javascript - Functions Javascript - Events Javascript - Cookies Javascript - Page Redirect Javascript - Dialog http://stackoverflow.com/questions/783818/how-do-i-create-a-custom-error-in-javascript Boxes Javascript - Void Keyword Javascript - Page Printing JavaScript Objects Javascript - Objects Javascript - Number Javascript - Boolean Javascript - Strings Javascript - Arrays Javascript - javascript error Date Javascript - Math Javascript - RegExp Javascript - HTML DOM JavaScript Advanced Javascript - Error Handling Javascript - Validations Javascript - Animation Javascript - Multimedia Javascript - Debugging Javascript - Image Map Javascript - Browsers IMS DB Resources Javascript - Questions And Answers Javascript - Quick Guide Javascript - Functions Javascript - Resources Selected javascript error message Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who JavaScript - Errors & Exceptions Handling Advertisements Previous Page Next Page There are three types of errors in programming: (a) Syntax Errors, (b) Runtime Errors, and (c) Logical Errors. Syntax Errors Syntax errors, also called parsing errors, occur at compile time in traditional programming languages and at interpret time in JavaScript. For example, the following line causes a syntax error because it is missing a closing parenthesis. When a syntax error occurs in JavaScript, only the code contained within the same thread as the syntax error is affected and the rest of the code in other threads gets executed assuming nothing in them depends on the code containing the error. Runtime Errors Runtime errors, also called exceptions, occur during execution (after compilation/interpretation). For example, the following line causes a runtime error because here the syntax is correct, b
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How do I create a custom Error in JavaScript? up vote 131 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(); var nie = new NotImplementedError("some message"); console.log("The message is: '"+nie.message+"'") Running this gives The message is: ''. Any ideas as to why, or if there is a better way to create a new Error subclass? Is there a problem with applying to the native Error constructor that I don't know about? javascript exception share|improve this question edited Jul 26 '13 at 21:01 B T 14.7k1397123 asked Apr 23 '09 at 22:35 cdleary 27.3k40129178 Does nie instanceof NotImplementedError assertion work after your changes? I thought that in order for this to work you need to define NotImplementedError.prototype.constructor explicitly. –jayarjo Jul 9 '11 at 9:45 Next time, please tear out all the extraneous code that isn't required to demonstrate your issue. Also, wtc is js.jar ? Is that needed to reproduce the problem? –B T Jul 26 '13 at 20:39 1 Edited this question so that its understandable in 10 seconds rather than 10 minutes –B T Jul 26 '13 at 20:46 I created an inheritance/class library that inherits from Error types properly: github.com/fresheneesz/proto –B T Sep 10 '13 at 17:33 1 jsfiddle for a few of the top answers. –Nate Sep 22 '15 at 13:56 | show 1 more comment 16 Answers 16 active oldest votes up vote 126 down vote accepted Update your code to assign your prototype to the Error.prototype and the instanceof and your asserts work. function NotImplementedError(message) { this.name = "NotImplementedError"; this.message = (message || ""); } NotImplementedError.prototype = Error.prototype; However, I would just throw your own object and just check the name property. throw {name : "NotImplement