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JavaScript - how to clear object
6 points
In this article, we would like to show you how to clear an object in JavaScript.
The below examples show solutions that:
- assign new empty object (
{}), - delete the object's properties.
In this solution, we create a new memory location with an empty object ({}) and we point existing object to that location.
Runnable solution:
xxxxxxxxxx1
let user = {2
id: 1,3
name: 'John',4
age: 435
};6
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user = {}; // empty object operation8
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console.log(JSON.stringify(user, null, 4)); // {}Notes:
- in that approach, the object cannot be
const,- that approach changes variable reference.
In this section, we use for loop to iterate over object properties and delete them.
Note: that approaches are slow when we empty large objects.
Runnable solution:
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const emptyObject = (object) => {2
for (const name in object) {3
if (object.hasOwnProperty(name)) {4
delete object[name];5
}6
}7
};8
9
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// Usage example:11
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const user = {13
id: 1,14
name: 'John',15
age: 4316
};17
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emptyObject(user); // empty object operation19
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console.log(JSON.stringify(user, null, 4)); // {}Runnable solution:
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const emptyObject = (object) => {2
const keys = Object.keys(object);3
for (const key of keys) {4
delete object[key];5
}6
};7
8
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// Usage example:10
11
const user = {12
id: 1,13
name: 'John',14
age: 4315
};16
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emptyObject(user); // empty object operation18
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console.log(JSON.stringify(user, null, 4)); // {}
