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Delete property from object
(version: 2)
Testing the performance of using `delete` keyword VS setting prop to null to remove an property of an object
Comparing performance of:
`delete` keyword vs Setting prop to `null`
Created:
7 years ago
by:
Registered User
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Script Preparation code:
var person = {name: "neka", age: 1, status: 'A', married: false, owner: false };
Tests:
`delete` keyword
delete person.name; delete person.age; delete person.status; delete person.married;
Setting prop to `null`
person.name = null person.age = null person.status = null person.married = null
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
`delete` keyword
Setting prop to `null`
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
28 days ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Goanna/6.8 PaleMoon/34.0.1
Browser/OS:
Pale Moon (Firefox Variant) 34 on Linux
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Embed Benchmark Result
Test name
Executions per second
`delete` keyword
4889568.5 Ops/sec
Setting prop to `null`
40195756.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into explaining the benchmark and its different approaches. **Benchmark Overview** The benchmark measures the performance of two ways to remove properties from an object: using the `delete` keyword and setting a property to `null`. The test case creates an object with several properties, including `name`, `age`, `status`, `married`, and `owner`. **Approaches Compared** There are two approaches compared: 1. **Using `delete` keyword**: This approach uses the `delete` operator to remove properties from the object. ```javascript delete person.name; delete person.age; delete person.status; delete person.married; ``` 2. **Setting prop to `null`**: This approach sets individual properties to `null` to effectively remove them from the object. ```javascript person.name = null; person.age = null; person.status = null; person.married = null; ``` **Pros and Cons of Each Approach** 1. **Using `delete` keyword**: * Pros: + More concise and expressive syntax. + Fewer memory allocations (since no new object is created). * Cons: + May not work as expected in certain situations, such as when the property is accessed before being deleted. + Can be slower due to the overhead of removing properties from the object's internal data structure. 2. **Setting prop to `null`**: * Pros: + More predictable behavior (since setting a property to `null` will always remove it). + May be faster due to the optimized performance of assigning `null` to properties. * Cons: + Less concise and less expressive syntax. + Involves more memory allocations (since new objects are created). **Library Used** In this benchmark, no libraries are explicitly mentioned. However, it's worth noting that in general, JavaScript engines have built-in optimizations for property removal, which can affect the performance of these two approaches. **Special JS Feature/Syntax** This benchmark does not use any special JavaScript features or syntax beyond basic JavaScript syntax. It only uses standard JavaScript operators and data structures. **Other Alternatives** There are a few alternative approaches that could be considered: 1. **Using `delete` on an array**: Since objects with arrays as properties can be more efficient to remove from, using `delete` on the array element might be faster. 2. **Using `Object.keys()` and `forEach()`**: This approach would involve iterating over the object's property names using `Object.keys()` and then removing each property using a callback function. 3. **Using a library or framework-specific optimization**: Depending on the specific library or framework being used, there might be optimized methods for removing properties from objects that could affect performance. Overall, this benchmark provides a good representation of the trade-offs between these two approaches and can help developers understand the implications of choosing one over the other in their own code.
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