Benchmark: delete object property vs filter array

Tests:

Delete
let obj = { a: 1, b: 1, c: 1, d: 1, e: 1, f: 1, g: 1, h: 1, i: 1, j: 1 } for (const key in obj) { delete obj[key] }
Filter
let arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'] for (const x of ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']) { arr = arr.filter(y => x !== y) }

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:

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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 benchmark and explain what's being tested, along with the pros and cons of different approaches.

**What is being tested?**

The benchmark measures the performance difference between two JavaScript operations:

1. **Delete object property**: This involves iterating over an object's properties using a `for...in` loop and deleting each property.
2. **Filter array**: This involves iterating over an array and filtering out elements that don't match a certain condition using the `filter()` method.

**Options compared**

The benchmark compares two approaches:

1. **Delete object property**
	* Approach: Iterating over properties using `for...in` loop and deleting each property.
	* Pros:
		+ Can be more efficient for objects with many properties, as it avoids creating a new array or object.
	* Cons:
		+ Can be slower due to the overhead of iterating over properties and checking their values.
2. **Filter array**
	* Approach: Iterating over an array and filtering out elements using `filter()` method.
	* Pros:
		+ Generally faster, as it creates a new array with filtered elements and doesn't require explicit looping or property deletion.
3. **Alternative approach**: One alternative is to use `Object.keys()` and `splice()` to achieve the same result as delete object property, but this is not being tested in this benchmark.

**Library used**

There is no library explicitly mentioned in the provided benchmark definition, but it's likely that the JavaScript engine (e.g., V8 in Chrome) provides some built-in optimizations or implementation details for these operations.

**Special JS feature or syntax**

The `for...in` loop and `filter()` method are standard JavaScript features. The `delete` operator is also a standard part of JavaScript.

**Other considerations**

Other factors that might affect performance include:

* Array length: Longer arrays can lead to slower filtering.
* Property value types: Different data types (e.g., numbers, strings, booleans) may have different performance characteristics.
* Context and environment: Browser-specific optimizations, caching, or other factors may influence results.

**Alternative alternatives**

Some alternative approaches for achieving the same result as delete object property include:

* Using `delete` on an individual property: `obj.deleteProperty('key')`
* Using `Object.keys()` to get an array of property names and then iterating over it
* Creating a new object with the desired properties removed

However, these alternatives are not being tested in this benchmark.

Related benchmarks:

delete object property vs filter array (version: 0)

delete object property vs filter array

Comparing performance of: Delete vs Filter

Created: 2 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):