Benchmark: Delete vs filter

Script Preparation code:

var obj = {
    overrides: {}
};

[...Array(1000).keys()].forEach((k, i) => obj.overrides[`l:${i}:e:${i}`] = {});

Tests:

delete
Object.keys(obj.overrides).forEach(key => { delete obj.overrides[key]; });
filter
const newObj = {}; Object.keys(obj.overrides) .filter(key => false) .forEach(key => newObj.overrides[key] = obj.overrides[key]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
filter

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Let's break down the provided benchmarking scenario for MeasureThat.net.

**Overview**

The test aims to compare the performance of two approaches: `delete` and `filter`, when removing properties from an object. The test uses JavaScript as the programming language.

**Options being compared**

There are two options being compared:

1. **Delete (`delete`)**: This approach uses the `delete` keyword to remove a property from an object.
2. **Filter (`filter`)**: This approach uses the `filter()` method to remove properties that meet a certain condition (in this case, always returning `false`, which effectively filters out all properties).

**Pros and Cons**

* **Delete (`delete`)**:
	+ Pros: Simple and efficient in terms of syntax.
	+ Cons: It requires using the `delete` keyword, which might be considered less readable than other approaches. Additionally, it can lead to unexpected behavior if not used carefully (e.g., modifying properties after deleting them).
* **Filter (`filter`)**:
	+ Pros: More concise and expressive in terms of syntax.
	+ Cons: It uses an external method (`filter()`), which might incur a small overhead due to function call and parameter passing. Additionally, it requires understanding the behavior of `filter()`, which can be non-intuitive for some developers.

**Library usage**

There is no explicit library used in this benchmark. However, the use of the `filter()` method implies that the JavaScript environment has access to a standard array and object implementation (i.e., ECMAScript).

**Special JS features or syntax**

No special JavaScript features or syntax are mentioned. The code uses only standard JavaScript language constructs.

**Other alternatives**

Other approaches to removing properties from an object might include:

* Using `Object.keys()` and then iterating over the keys to remove them manually.
* Utilizing `for...in` loops with an iterator to iterate over the object's own enumerable properties and delete them accordingly.
* Implementing a custom function for removing properties, which could provide more control over performance or optimization.

Keep in mind that these alternatives might have different performance characteristics or trade-offs compared to the `delete` and `filter()` approaches used in this benchmark.

Related benchmarks:

Delete vs filter (version: 0)

Comparing performance of: delete vs filter

Created: 5 years ago by: Guest

Jump to the latest result

delete

filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):