How to use the delete operator In Javascript

1. Using the reduce() and filter() methods

The delete operator in JavaScript can be used to remove a property (key-value pair) from an object.

Syntax of delete operator:

delete objectName.propertyName;

Example:

The below code removes the ‘age’ key from the object, leaving only the ‘name’ and ‘country’ keys in the object.

Javascript

const details = {
    name: 'Alex',
    age: 30,
    country: 'Canada'
};

console.log('Original Object:', details);
delete details.age;
console.log('Object after deleting age key:', details);

Output

Original Object: { name: 'Alex', age: 30, country: 'Canada' }
Object after deleting age key: { name: 'Alex', country: 'Canada' }

Explanation:

The original details object contains properties for “name”, “age”, and “country”.
The delete operator is used to remove the “age” property from the details object.
After deleting the “age” property, the modified details object is logged to the console.

How to remove a key-value pair from JavaScript object?

JavaScript object is a powerful data structure that combines keys and values. Sometimes, we need to delete a specific key-value from an object. It can be done using the approaches given below.

How to remove a key-value from JavaScript object ?

There are several methods that can be used to remove a key from a JavaScript object:

Table of Content

Using the reduce() and filter() methods
Using the delete operator
Destructuring with the Rest Operator
Using Object.assign()
Using Object.fromEntries() and Object.entries()
Using _.omit method of Underscore.js library
UseCase of Remove a key from JavaScript object

How to use the delete operator In Javascript

Syntax of delete operator:

How to remove a key-value pair from JavaScript object?

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