Benchmark: spread vs delete

Tests:

spread
const object1 = { a: { values: [1,2,3,4,5] }, b: "test" }; const { a, ...rest} = object1;
delete
const object1 = { a: { values: [1,2,3,4,5] }, b: "test" }; delete object1.a;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
delete

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 12 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser/OS: Firefox 133 on Linux

View result in a separate tab

Test name	Executions per second
spread	18396804.0 Ops/sec
delete	2347460.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring performance differences is crucial in software development, and tools like MeasureThat.net help us understand how various approaches impact execution time.

The provided JSON represents two individual test cases for JavaScript microbenchmarks:

1. **Spread vs Delete**: This benchmark compares the performance of using the spread operator (`...`) to extract properties from an object versus deleting a property directly (`delete`).

Let's break down the options being compared:

**Option 1: Spread Operator (`...`)**

* Pros:
	+ More readable and concise code
	+ Less error-prone, as it doesn't involve manual property name manipulation
* Cons:
	+ May be slower due to the overhead of creating a new object with extracted properties

The spread operator is used in JavaScript since ECMAScript 2018 (ES10). It allows you to extract all or some properties from an object and assign them to a new object.

**Option 2: Delete Operation (`delete`)**

* Pros:
	+ Often faster, as it simply removes the property reference
	+ Less memory allocation overhead compared to creating a new object
* Cons:
	+ May be more prone to errors if not used carefully (e.g., removing a property reference instead of the actual value)

In this benchmark, `delete` is used to remove the `a` property from `object1`. This approach can be faster because it doesn't involve creating a new object with extracted properties.

**Other Considerations**

* **Memory Allocation**: The spread operator creates a new object with extracted properties, which can lead to higher memory allocation overhead. In contrast, the `delete` operation only removes the property reference.
* **Code Readability and Maintainability**: The spread operator is often considered more readable and maintainable because it's more concise and explicit about its intent.

**Library Usage**

There are no libraries used in these benchmark test cases.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in the provided code snippets. They are straightforward JavaScript objects and property extraction/exclusion operations.

**Alternatives**

If you're interested in exploring alternative approaches, consider the following:

* **Destructuring assignment**: Similar to the spread operator, but used for destructuring multiple values from an array or object.
* **Object property iteration**: Using `for...in` or `for...of` loops to iterate over object properties and perform operations on them.
* **ES6 Object Methods**: Exploring other object methods like `Object.keys()`, `Object.values()`, and `Object.entries()` for extracting properties.

Please note that the performance differences between these approaches may vary depending on the specific use case, browser, and JavaScript engine being used.

Related benchmarks:

spread vs delete (version: 0)

Comparing performance of: spread vs delete

Created: 3 years ago by: Guest

Jump to the latest result

spread

delete

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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