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Lodash _.create

Overview

The lodash _.create method is a utility function that creates an object that inherits from the specified prototype object. This function can be used to create an object with a specific prototype chain without invoking the constructor function, which is useful in some scenarios where object creation is restricted.

To use _.create, simply pass in the prototype object that you want to use as the new object's prototype. Here is an example:

let myPrototype = {
  hello() {
    console.log("Hello, world!");
  }
};

let myObject = _.create(myPrototype);

myObject.hello(); // "Hello, world!"

In the above example, myObject is created using _.create and inherits from myPrototype. So, when we call myObject.hello(), we can see that it logs "Hello, world!" to the console, which is defined in the hello method of myPrototype.

One important thing to note is that _.create does not invoke the constructor function of the object, which means that the object is not fully initialized. This means that properties and methods added to the object's prototype in the constructor function will not be available on the newly created object.

However, properties and methods added to the object using the Object.defineProperty or Object.defineProperties functions will be available on the newly created object.

function MyClass() {
  this.message = "Hello, world!";
}

MyClass.prototype.hello = function() {
  console.log(this.message);
}

let myOtherObject = _.create(MyClass.prototype);

Object.defineProperty(myOtherObject, "message", {
  value: "Hello, everyone!"
})

myOtherObject.hello(); // "Hello, everyone!"

In the above example, we create a new object myOtherObject using _.create with MyClass.prototype as the prototype. Since we did not call the constructor function of MyClass, the message property is not set on myOtherObject.

However, we are able to set the message property on myOtherObject using Object.defineProperty, and it can be accessed by the hello method defined on the prototype of MyClass.

In summary, the _.create method is a convenient utility function for creating objects with a specific prototype. However, it does not fully initialize the object by invoking the constructor function, so some properties and methods may not be available.