Benchmark: delete vs destructure

Script Preparation code:

var a = {
  b: 1,
  c: 2
}

Tests:

destructure
var {c, ...rest} = a
delete
delete a.c

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
destructure
delete

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):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that contains information about the benchmark, including its name, description, script preparation code, and HTML preparation code (which is null in this case).

In this specific case, the benchmark is defined by two separate benchmarks: "delete" and "destructure". The `Script Preparation Code` field provides the initial JavaScript code for each benchmark. The `Html Preparation Code` field is empty.

The script preparation code for both benchmarks creates an object `a` with properties `b` and `c`, respectively.

**Test Cases**

There are two individual test cases, each represented by a JSON object:

1. **"destructure"`**

This test case has the following characteristics:
	* The `Benchmark Definition` field contains the JavaScript code `var {c, ...rest} = a`. This is destructuring assignment syntax, which creates a new variable `rest` that includes all properties of `a` except for `c`.
	* The purpose of this test case is to measure the performance of using destructuring assignment.

2. **"delete"`**

This test case has the following characteristics:
	* The `Benchmark Definition` field contains the JavaScript code `delete a.c`. This is the syntax for deleting a property from an object.
	* The purpose of this test case is to measure the performance of using the `delete` operator.

**Performance Comparison**

The two test cases are competing for execution time. The benchmarker wants to know which approach (destructuring assignment or using the `delete` operator) is faster, and how the results vary between different browsers and devices.

**Pros and Cons of Different Approaches:**

1. **Destructuring Assignment:**
	* Pros:
		+ Can be more readable and maintainable for some developers.
		+ Allows creating new variables with minimal overhead.
	* Cons:
		+ May have higher memory overhead due to the creation of new variables.
2. **Delete Operator:**
	* Pros:
		+ Often faster than destructuring assignment, as it modifies the original object in-place.
		+ Can be more efficient for large objects or complex cases where property deletions are common.
	* Cons:
		+ May have a steeper learning curve for developers unfamiliar with this syntax.

**Library and Special JS Features:**

In neither of the test cases is there any explicit use of libraries or special JavaScript features. The code only uses standard JavaScript syntax.

**Other Alternatives:**

There are other approaches to delete properties from objects, such as:

* Using the bracket notation (`a['c'] = undefined;`)
* Creating a new object without the deleted property (`const b = { ...a }; delete b.c;`)
* Using a library like Lodash's `omit` function

However, these alternatives are not part of the benchmarked code, and their performance might vary depending on the specific use case.

Related benchmarks:

delete vs destructure (version: 0)

Comparing performance of: destructure vs delete

Created: 6 years ago by: Guest

Jump to the latest result

destructure

delete

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):