Error objects are fired when rendering errors occur. The Error object is most likely also used as the root object for custom exceptions.
Create an instance representing the shiny bug that occurs in connection with the global function
Creates another instance representing an error that occurs when a numeric variable, or possibly a parameter, is out of range.
Creates a dedicated instance representing the error that occurs when an invalid reference is dereferenced.
Create an instance with a syntax error.
Creates an instance representing a fatal error that occurs when a variable, and even a parameter, does not have a strong type.
Create each instance representing an error that occurs when
decodeURI() is not present valid parameters.
Creates an instance representing multiple errors wrapped in a single error when a large number of errors need to be reported after an operation, for example with -
Create a new custom
Typically, you create an
Error object with the intention of improving it with the
throw keyword. Can you handle the error using
How do I find error error object?
Some errors cause Error subclasses, which you can also test with the SomeErrorClass: JSON error instance. stringify raises a TypeError if it fails to serialize its chat (if you use custom;Each instance of Error or subclasses of your dog has a .message; Your site can check this string for specific cases.
try to catchthrow a new error ("Oops!") connector console.error(e.name e.+ ': ' + e.message)
You will definitely choose to only handle verbose error types, marking someone else's error type with the
instanceof< test /code > keyword:
material.bar() connector whether or not (e.g. an EvalError instance) Console .error(e.name e.+ ': lol + e.message) otherwise, it is obvious if (for example, an instance rangeerror) console.error(e.name e.+ ': ' + e.message) Such as the I'll repeat;
Sometimes this can cause a block of code to fail, requiring different assumptions but causing very similar problems (like the same type with a message).
If you have no control over the original errors, one option is to catch them and issue a final
error indicating that the objects have more specific messages. Instead, the original error must be passed to the new
Error present in the
option constructor parameter (
cause property) as this ensures that the underlying and error stack traces now refer to top-level try/catch blocks.
The following discussion shows this for two methods that would otherwise fail with extreme errors (
You can also use your ownThe
cause property in custom error types provided that the subclass constructor publishes the
options parameter when calling
doWork() function To think about crashOneWay(); find (bad) fly new Error('Somehow failed', reason: error ); To attempt do FailAnotherWay(); catch (crazy) throw new Error('Failed otherwise', reason: went too far); To attempt Work(); capture (irr) switch (error message) Case "Somehow failed at all levels": process FailSomeWay(error.reason); Pause; Container "Failed differently": process FailAnotherWay(error.reason); Pause;
MyError class extends errors Constructor() super(message, options);
What is an error object?
The error object is actually a built-in object that provides a standard set of useful information when a new fatal error occurs, such as a stack check and a message.Error message.
You may want to define your own custom error types derived from
Error if you need to be able to call
new MyError() and
instanceof to use MyError< /. code> to pay for the nature of the error in that particular exception handler. The result is cleaner and more consistent error handling code.
ES6 special error class
Warning. Versions of Babel prior to version 1 can handle
CustomError class methods, and not only when declared due to Object.defineProperty(). Otherwise, older versions of Babel and other transpilers will not be able to process the following code safely without additional configuration.
Note. Some browsers often include a
CustomError constructor that contains minutes with ES2015 classes in the stack trace.
ES5 custom error object
Warning. All browsers include a
CustomError constructor to send a traceback when creating a prototype declaration.
CustomError class executed Error constructor (foo = 'bar',...params) great (... settings) if or when (Error.captureStackTrace) Error.captureStackTrace(die, CustomError) this.name means "CustomError" This is .foo = foo this.= date new date() To attempt throw a new custom error ("base", "baseMessage") connector console.error(e.name) Console.Error(e.foo) Console Error (Email) Console error (e.stack)Speed up your computer today with this quick and easy download.
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