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Object property: delete vs undefined 2
(version: 1)
Comparing performance of:
Delete vs Set undefined
Created:
5 years ago
by:
Registered User
Go to the latest result
Tests:
Delete
const obj = { a:1, b:2, c:3 }; delete obj.b;
Set undefined
const obj = { a:1, b:2, c:3 }; obj.b = undefined;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Delete
Set undefined
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser/OS:
Chrome 131 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=575299" width="100%" height="500px"></iframe>
Set undefined
118.1M/s
Delete
6.4M/s
View exact numbers
Test name
Executions per second
✓
Set undefined
118,050,408 Ops/sec
Delete
6,406,506 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its options. **Benchmark Definition JSON** The benchmark definition provides information about the test case. In this case, there is only one benchmark definition: ```json { "Name": "Object property: delete vs undefined 2", "Description": null, "Script Preparation Code": null, "Html Preparation Code": null } ``` This JSON defines a test case that compares two approaches for deleting an object property. **Individual Test Cases** There are only two individual test cases: 1. **Delete**: This test case uses the `delete` operator to delete a property from an object. ```javascript const obj = { a:1, b:2, c:3 }; delete obj.b; ``` 2. **Set undefined**: This test case sets a property to `undefined` using the assignment operator. ```javascript const obj = { a:1, b:2, c:3 }; obj.b = undefined; ``` **Options being compared** The two options being compared are: * Using the `delete` operator to delete a property. * Setting a property to `undefined` using the assignment operator. **Pros and Cons of each approach** Here's a brief overview of the pros and cons of each approach: 1. **Delete**: * Pros: + More concise and readable syntax. + Can be more efficient in some cases, as it doesn't require creating a new object or using the `Object.delete` method. * Cons: + Not all browsers support the `delete` operator for property deletion. For example, older versions of Internet Explorer do not support it. 2. **Set undefined**: * Pros: + More widely supported, as it's a standard JavaScript assignment operation. + Works in all modern browsers and versions of Internet Explorer. * Cons: + Requires more code to achieve the same result (i.e., `obj.b = undefined;` vs. `delete obj.b;`). **Library usage** None of the test cases use any libraries or external dependencies. **Special JS features/syntax** There are no special JavaScript features or syntax used in these benchmark test cases. They rely solely on standard JavaScript operations. **Other alternatives** If you wanted to compare other approaches for deleting a property, some alternative options could include: * Using `Object.delete` (not supported in older browsers). * Creating a new object with the desired properties and assigning it to a new variable (e.g., `const newObj = { b: undefined }; const objNew = { ...obj, ...newObj }; delete obj.b;`). * Using a library like Lodash's `unset` function. Keep in mind that these alternative approaches may introduce additional complexity or performance overhead and should be carefully considered depending on the specific use case.
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