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Lodash _.entriesIn

Overview

lodash is a popular and versatile JavaScript utility library that is widely used by developers to perform complex operations in a more efficient and elegant way. One of the many methods provided by lodash is the _.entriesIn method, which is used to extract all the key-value pairs from an object or an array, including those properties that are inherited from its prototype chain. In this article, we will provide a comprehensive overview of the _.entriesIn method, its syntax, parameters, and usage.

Syntax:

_.entriesIn(object)

Parameters:

  • object (Object): The object to extract the key-value pairs from.

Returns: (Array): Returns the new array of the extracted key-value pairs.

Usage: The _.entriesIn method is used to extract all the key-value pairs from an object or an array, including those properties that are inherited from its prototype chain. For example, we can use the _.entriesIn method to extract all the key-value pairs from an object and log them to the console:

const myObj = { a: 1, b: 2 };
console.log(_.entriesIn(myObj));
// Output: [ ['a', 1], ['b', 2] ]

As we can see in the above example, the _.entriesIn method returns an array of arrays that contains all the key-value pairs of the myObj object.

We can also use the _.entriesIn method to extract all the key-value pairs from an array:

const myArr = ['a', 'b', 'c'];
console.log(_.entriesIn(myArr));
// Output: [ ['0', 'a'], ['1', 'b'], ['2', 'c'] ]

In this case, the _.entriesIn method returns an array of arrays that contain the index-value pairs of the myArr array.

One of the most important aspects of the _.entriesIn method is that it includes the key-value pairs that are inherited from the prototype chain of the object or array. For example:

function MyClass() {
  this.a = 1;
  this.b = 2;
}
MyClass.prototype.c = 3;

const myObj = new MyClass();

console.log(_.entriesIn(myObj));
// Output: [ ['a', 1], ['b', 2], ['c', 3] ]

In this example, we have defined a class MyClass that has two properties a and b. We have also added a new property c to its prototype chain. When we create a new instance of MyClass and pass it to the _.entriesIn method, the method returns an array that contains all the properties of the instance, including the inherited property c.

In conclusion, the _.entriesIn method is a powerful utility method that can be used to extract all the key-value pairs from an object or an array, including the properties that are inherited from its prototype chain. This method can be very useful in situations where we need to manipulate objects or arrays in a more efficient and elegant way.