JS ObjectsLesson #115
JavaScript Error Reference
JavaScript has a built in error object that provides error information when an error occurs.
The Error Object
JavaScript has a built in error object that provides error information when an error occurs.
The error object provides useful properties like name and message.
Error Object Methods & Properties
| Property | Description |
|---|---|
| new Error() | Creates a new Error object |
| name | Sets or returns an error name |
| message | Sets or returns an error message |
| cause | Sets or returns an error cause |
| Error.isError(x) | Returns true if a value (x) is an Error |
Error Names
Six different values can be returned by the error name property:
| Error Name | Description | Try it |
|---|---|---|
| EvalError | Deprecated - use SyntaxError instead | |
| RangeError | A number "out of range" has occurred | Try it |
| ReferenceError | An illegal reference has occurred | Try it |
| SyntaxError | A syntax error has occurred | Try it |
| TypeError | A type error has occurred | Try it |
| URIError | An error in encodeURI() has occurred | Try it |
Non-Standard Properties and Methods
> In older JavaScript code you might find non-standard properties and methods.
> Do not use these properties and methods. They will not work in all browsers.
> | Property | Description |
> | --- | --- |
> | arguments | Deprecated |
> | caller | Deprecated |
> | columnNumber | Firefox only |
> | description | Microsoft only |
> | displayName | Firefox only |
> | fileName | Firefox only |
> | lineNumber | Firefox only |
> | number | Microsoft only |
> | stack | Firefox only |
> | Methods | Description |
> | evalError() | Deprecated |
> | internalError() | Firefox only |
> | toSource() | Non Standard |
See Also:
> JavaScript Errors
> JavaScript Silent Errors
> JavaScript Error Statements
> JavaScript Debugging