Difference between throw Error(‘msg’) and throw new Error(‘msg’)

The throw statement allows you to create an exception or a custom error. The exception can be like a Javascript string, a number, a boolean, or an object. So, If you use this statement together with the try…catch statement. It allows you to control the flow of the program and generate accurate error messages. For example: throw “too small” (throw a text), throw 500 (throw a number), etc.

First of all, throw Error() and throw new Error() are functionally equivalent.

Syntax:

throw Error("Enter your error message here");

Error object: An object containing the error information is generated and passed to catch as an argument. Error object has three properties: name, message, and stack.

Error() constructor is used to create a new error object.

Example: For better understanding, we will take an example:

Javascript

// throw Error()
try {
    throw Error("msg");
} catch (e) {
    console.log("for Error()");
    console.log(e);
}

Output:

The output of the above code(Error)

In the above code, I added a try…catch statement with having throw Error(). This code will do that the  ‘msg’ error is thrown in the try-block which will be get executed by catch statements.

new Error object: It captures several properties of the place where the error happened.  It exposes an error event with two parameters name & message. It also terminates further execution.

Example: For better understanding, we will take an example:

Javascript

// throw new Error()
try {
    throw new Error("msg");
} catch (e) {
    console.log("for new Error()");
    console.log(e);
}

Output :

The output of the above code(new Error)

In the above code, I added a try…catch statement with having throw new Error(). This code will do that the  ‘msg’ error is thrown in the try-block which will be get executed by catch statements.  

As you can see in the images of both of the consoles, throw an error(‘msg’) and throw a new error(‘msg’) give the same results. 

Note: Error() and new Error() returns an object as a result.

Difference between throw Error() and throw new Error():

throw Error()	throw new Error()
Error(…) is less reliable and consistent.	new Error(…) is more reliable and consistent.
the Error object contains a stack trace and other useful debugging information which is lost when you use a string literal.	Creating objects using ES6 classes requires the use of new and extending Error via a class is the only way to preserve stack traces.
We can create an exception or a custom error using throw Error()	The new Error() method is an inbuilt application programming interface of the Node module
throw Error() is like a Javascript string, a number, a boolean, or an object.	It returns specific errors as defined in the message value which is passed as an argument.
We can control the flow of the program and generate accurate error messages using throw Error()	It Creates a new Error object and sets the error.message property to the provided text message.
The throw statement throws an exception.	Its syntax is -: new Error(message)