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Javascript modify error message

try { throw new Error( ' First one' ) } catch ( error) { let e = new Error( ` Rethrowing the " $ { error. message} " error` ). 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. message: 任意。 人間が読めるエラーの説明。 fileName: 任意。 生成された Error オブジェクト上の fileName プロパティに設定される値。 デフォルトでは、 Error( ) コンストラクターを呼び出したコードを含むファイルの名前。 lineNumber: 任意。. A few years ago I gave a talk at MountainWest JS called Error Handling in node. In that talk I extolled the virtues of creating custom error objects by extending the built- in Error type. Given that Error objects are much better than strings, what if we need to include more than a message with our error?

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  • Video:Error message javascript

    Javascript message modify

    This property contains a brief description of the error if one is available or has been set. SpiderMonkey makes extensive use of the message property for exceptions. The message property combined with the name property is. Our errors should support basic error properties like message, name and, preferably, stack. JavaScript allows to use throw with any argument, so technically our custom error classes don' t need to inherit from Error. captureStackTrace( this, this. constructor) / / Creates the this. stack getter this. name; / / Used to cause messages like " UserError: message" instead of the default " Error: message" this. message = message; / / Used to set the. It will also add the error message to the stack trace - which was missing from Karel' s example.

    ofAfter some testing it appears that babel. io does not properly account for all the asserts ( extending from a custom extended Error). You cannot, without tampering with the 3rd party lib assert. Behind the scenes, uses a fail function, that is private in the context of assert and you cannot tell assert to use a custom fail function. this is the function used behind. toString = function( ) { ' use strict' ; var obj = Object( this) ; if ( obj! = = this) { throw new TypeError( ) ; } var name = this. name; name = ( name = = = undefined)? ' Error' : String( name) ; var msg = this. message; msg = ( msg.