How to use Destructuring In Javascript
Rather than giving all the required fields of the object array in the map() method which is a difficult task if there are multiple fields in the object. we can use the map method in the below way to create a partial object array. The first parameters must be the fields that are not needed in the resultant object array.
Syntax:
partialObjectArray = ObjectArray.map(({ key 1, key 2, ...rest }) => rest);
Note: key 1, and key 2 are the fields that are not required in the resultant object array.
Example: This is another illustration to create an array of partial objects from another array using the map() method.
let = studentDetails = [
{
name: 'dinesh',
age: 20,
marks: 30,
Grade: 'F'
},
{
name: 'divi',
age: 20,
marks: 60,
Grade: 'B'
},
{
name: 'vignesh',
age: 30,
marks: 80,
Grade: 'A'
}]
// The parameter marks is not required
// in the resultant object array
let partialStudentDetails = studentDetails.map((
{ marks, ...rest }) => rest);
console.log(partialStudentDetails);
Output
[ { name: 'dinesh', age: 20, Grade: 'F' }, { name: 'divi', age: 20, Grade: 'B' }, { name: 'vignesh', age: 30, Grade: 'A' } ]
In the above example, we get name, age, and marks key-value pairs in a partial object array.
How to create an array of partial objects from another array in JavaScript ?
Creating an array of partial objects from another array is a useful technique in JavaScript, especially for data transformation and manipulation. This guide covers various methods to efficiently create these arrays, enhancing your ability to work with complex data structures.
Importance of Creating Partial Objects:
Creating partial objects is crucial for:
- Simplifying data structures for specific use cases.
- Improving performance by reducing the size of data handled.
- Enhancing readability and maintainability of code by focusing on relevant properties.
These are some common methods:
Table of Content
- Using the map() method
- Using Destructuring
- Using reduce Method()
- Using forEach() method
- Using a for Loop