Object.entries() Method JavaScript

Object.entries() Method JavaScript

Now, the Object.entries() method comes into play when we want to work with the properties of an object. This function, or we have to say method in JavaScript, helps to convert the thing into an array. By doing this, don’t you think we can completely change, use or manipulate them very easily?

By converting it into an array, we have an option to insert or delete using an index number. And also, we can use this method in different applications, like we can apply loops to it.

Working of Object.entries() Method JavaScript

When we pass the Object name as the parameter in the Object.entries() like below

Object.entries(parameter);

Then, all the properties in the object will convert as an array like the one below.

[ [ property1 , value ], [ property2 , value ], [ property3 , value ], [ property4 , value ] ]

Check out the image below for a better understanding:

Below is the object 

It is getting converted into an array.

Syntax

Object.entries(ObjectName);

Example

//This is an object.
const studentObj = {
  name: "Amarjeet",
  class: 10,
  roll: 27,
  age: 22
};

//Below is the method that converts the object to an array.
const data = Object.entries(studentObj);

console.log(data);

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Output

Getting Properties With Indices

Suppose we want to fetch a particular property from the object. So here, we can put the parameter as an index of the Object. For a better understanding, check below:

Syntax

Object.entries(objectName)[index];

Example

//This is an object.
const studentObj = {
  name: "Amarjeet",
  class: 10,
  roll: 27,
  age: 22
};

//Below is the method that converts the object to an array.
//Here, we are also putting the index as 2.
const data = Object.entries(studentObj)[2];

console.log(data);

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Output

String into Array

What if you have a string and you want to convert it as an array? For example, you have the string “Amarjeet.” Now you want to convert it as an array of all characters of the string like below:

[A, m, a, r, j, e, e, t]. So, for this, we can use the same Object.entries() method.

Syntax

const data = "String";
console.log(Object.entries(data)); 

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Example

//This is a string variable.
const data = "Amarjeet";

//Below is the method that converts the string to an array.
console.log(Object.entries(data)); 

You can also try this code with Online Javascript Compiler

Run Code

Output

Frequently Asked Question

Can we convert an integer into an array like in the above example of String?

No, we cannot convert the integer into an array. But one thing we can do is we will take an integer as a string then it will work properly.

Can we use Object.entries() with strings?

Yes, we can use Object.entries() with strings. When we do this, then the array will be displayed as the key value paired like string char with its indices.

What is the best advantage of using the Object.entries method?

The best advantage is we can iterate it as an array with the key-value pair. And in competitive programming, this method helps us a lot to solve questions very quickly.

Do we have any alternative to this method?

Yes, we can create an empty array and iterate the string from start to end. And for every character, by using the charAt method, we will assign it to the array. By following this method, it will work the same method as Object.entries.

What are objects in JavaScript?

Object is a collection of different data. For example, objects as students that contain property as Name, Age, Class, School, etc.

Conclusion

In this article, we have tried to learn the Object.entries() Method JavaScript. We have covered several example which contain fetching value with index and converting string into Array.

Check out the relevant articles related to this topic:
 

• Object Methods in JavaScript
   
• Object References and Copying in JavaScript
   
• Object Prototype

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