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(version: 0)
delete vs null vs undefined vs void 0 vs Object.create(null)
Comparing performance of:
null vs undefined vs delete
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var a = { a: 999, b: 3000 }
Tests:
null
a.a = null; a.b = null;
undefined
a.a = undefined; a.b = undefined;
delete
delete a.a; delete a.b;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
null
undefined
delete
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark JSON and explain what's being tested. **Benchmark Definition** The benchmark is testing four different approaches for deleting properties from an object: 1. `null` (assigning `null` to a property) 2. `undefined` (assigning `undefined` to a property) 3. `delete` (using the `delete` keyword to delete a property) Additionally, it's comparing these approaches against each other. **Pros and Cons of Each Approach** 1. **Null**: Assigning `null` to a property effectively removes the property from the object. However, this approach can lead to unexpected behavior if not used carefully (e.g., assigning `undefined` to a property that's already been deleted). 2. **Undefined**: Similar to `null`, assigning `undefined` to a property has the same effect as deleting it using the `delete` keyword. 3. **Delete**: The `delete` keyword is specific to JavaScript and allows direct deletion of properties from an object. This approach is concise but might not be supported by all browsers or environments. **Other Considerations** * When assigning values to properties (like in the provided script preparation code), it's essential to remember that setting a property to a value doesn't remove it from the object if you use the `in` operator or other methods that check for property existence. * The benchmark doesn't account for potential side effects, such as modifying other properties of the same object. **Library Used** None **Special JavaScript Feature/Syntax** The only special feature used here is the `delete` keyword, which is specific to JavaScript and allows direct deletion of properties from an object. **Alternatives** Other alternatives for deleting properties from objects include: * Using a library like Lodash or Underscore.js, which provide utility functions for object manipulation. * Utilizing the `Object.keys()` method with `filter()` and `map()` to recreate the object without the desired property. * Creating a custom function to iterate through the object's properties and delete them manually. Keep in mind that these alternatives might not be as concise or efficient as using the `delete` keyword, but they can offer more control over the deletion process.
Related benchmarks:
Delete vs destructure for objects
Object property: delete vs undefined 2
delete vs null vs undefined vs void 0 vs Object.create(null) propertie
Object.create(null) vs Object literal
Delete vs Undefined
Comments
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