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lang-js
this.name = 'MyError'outside of the function and change it toMyError.prototype.name = 'MyError'.function MyError(message) { this.message = message; this.stack = Error().stack; } MyError.prototype = Object.create(Error.prototype); MyError.prototype.name = "MyError";MyError.prototype.constructor = MyErrortoo.MyError.prototype = Object.create(Error.prototype)(or new Error) is overwriting all members ofMyError.prototype. ThereforeMyError.prototype.constructoris actuallyError.prototype.constructor, since we just assigned the entireError.prototypetoMyError.prototype. This is a side effect of JavaScript not really an object-oriented language, but a prototypal language. So this is why we assignMyError.prototype.constructor = MyErrorback to the MyError constructor function.