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Lodash _.cloneDeep

Overview

lodash is a popular JavaScript utility library that provides a wide range of functions to simplify JavaScript coding. One of the most commonly used methods is the _.cloneDeep() method, which creates a deep copy of a given object or array.

In JavaScript, objects and arrays are passed by reference, which means that when an object or array is copied, only the reference of the original object is passed and not the actual values. As a result, any changes made to the copied object are also reflected in the original object, which can result in unintended consequences. The _.cloneDeep() method, however, creates a completely new and independent copy of the original object or array, effectively breaking the reference and preventing any unwanted changes.

The _.cloneDeep() method can be used with any type of object, including arrays, objects, functions, and primitives. It works recursively to ensure that all child objects are also copied, so that the new object is completely independent.

Example usage of the _.cloneDeep() method:

const originalObject = { 
  name: "John",
  age: 30,
  address: {
    street: "123 Main St",
    city: "Anytown",
    state: "CA"
  }
};

const copiedObject = _.cloneDeep(originalObject);

In the above example, a new object called originalObject is created, which contains a name, age, and address property. The address property, in turn, contains another set of properties. The _.cloneDeep() method is then used to make a complete and independent copy of the originalObject, which is stored in copiedObject.

The method _.cloneDeep() is useful in many cases when working with JavaScript objects and arrays. Its ability to create a deep copy of the original structure makes it easy to work with and modify without worrying about accidental changes to the original.