How to remove a property from a JavaScript object

There are two ways to remove a property from a JavaScript object: one is the mutable way of doing it by using the delete operator. And the second one is the immutable way of doing it by using object restructuring. Let us go through each of these:

1. The delete operator

delete is a JavaScript instruction that allows us to remove a property from a JavaScript object. There are a couple of ways to use it:

delete object.property;

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delete object['property'];

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The operator deletes the corresponding property from the object.

let blog = {name: 'Wisdom Geek', author: 'Saransh Kataria'};
const propToBeDeleted = 'author';
delete blog[propToBeDeleted];
console.log(blog); // {name: 'Wisdom Geek'}

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The delete operation modifies the original object. Therefore it is a mutable operation.

2. Object destructuring

Using the object restructuring and rest syntax, we can destructure the object with the property to be removed and create a new copy of it. After the destructuring, a new copy of the object would be created and assigned to a new variable without the property that we chose to remove.

const { property, ...remainingObject } = object;

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For example:

let blog = {name: 'Wisdom Geek', author: 'Saransh Kataria'};
const { author, ...blogRest } = blog;
console.log(blogRest) // {name: 'Wisdom Geek'};
console.log(blog); // {name: 'Wisdom Geek', author: 'Saransh Kataria'}

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If we want to do this dynamically, we can do:

const name = 'propertyToBeRemoved';
const { [name]: removedProperty, ...remainingObject } = object;

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For example:

let blog = {name: 'Wisdom Geek', author: 'Saransh Kataria'};
const name = 'author';
const { [name]: removedProperty, ...remainingObject } = blog;
console.log(removedProperty); // Saransh Kataria
console.log(remainingObject); // {name: 'Wisdom Geek'}