JavaScript Inheritance: When to Use `new` vs. `Object.Create`?

Correct JavaScript Inheritance: Understanding the Best Approaches

JavaScript supports various inheritance techniques, often leading to confusion among developers. This article clarifies the preferred methods, including the use of new and Object.Create.

Understanding the Difference: new vs. Object.Create

new is a keyword used to create a new instance of an object and invoke its constructor function. On the other hand, Object.Create creates a new object that inherits from an existing object without calling the constructor.

When to Use Object.Create

Object.Create is primarily used when inheriting from an existing object without the need for the constructor to be invoked. For example, creating a RestModel that inherits the prototype of Model without calling the Model constructor:

RestModel.prototype = Object.create(Model.prototype);

When to Use new

new should be used when creating a new instance of an object and invoking its constructor. This is often necessary when working with custom types and classes. For example, creating a RestModel instance and calling the Model constructor:

function RestModel() {
  Model.call(this); // Call the Model constructor
  ...
}

Additional Notes

• Object.Create is not supported in all JavaScript environments, but can be shimmed using new.
• The choice between new and Object.Create depends on the specific inheritance requirements.
• It's important to understand the purpose and limitations of each method before making a decision.

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