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The constructor method in JavaScript is used to return the function that created an object’s prototype. This method is a property of all objects in JavaScript, and can be used to check the type of an object.

Here is an example of how the constructor method works:

const string1 = 'Hello, world!';

const result = string1.constructor;

// the result will be: [Function: String]

In the code example above, we first declare a string called string1 that contains the text Hello, world!. We then use the constructor method to get the function that created the string1 string’s prototype. The constructor method is a property of all objects in JavaScript, and can be accessed by using the . dot notation on an object. In this case, we access the constructor method on the string1 string.

As a result of calling the constructor method, the result variable will be set to [Function: String], which indicates that the string1 string was created by the String function. This can be useful when we need to check the type of an object in JavaScript.