Benchmark: delete vs new obj

Tests:

delete
let x = { "url": "ssss", "_id": "asdsadasdasda", "ongoing": "", "progress": { "taxes": { "total": 2, "current": 2, "error": 0, "errorList": [] }, "categories": { "total": 4, "current": 4, "error": 0, "errorList": [] }, "products": { "total": 11, "current": 11, "error": 0, "errorList": [] }, "customers": { "total": 6, "current": 6, "error": 6, "errorList": [ "ERROR: Customer john@gmail.com import failed, Id source: 1, Response: The email-user already exists!", "ERROR: Customer evelyn@gmail.com import failed, Id source: 2, Response: The email-user already exists!", "ERROR: Customer imbluedata@gmail.com import failed, Id source: 3, Response: The email-user already exists!", "ERROR: Customer admin@gmail.com import failed, Id source: 4, Response: The email-user already exists!", "ERROR: Customer harry@gmail.com import failed, Id source: 5, Response: The email-user already exists!", "ERROR: Customer test1test2@xxx.ru import failed, Id source: 6, Response: The email-user already exists!" ] }, "orders": { "total": 3, "current": 3, "error": 0, "errorList": [] }, "reviews": { "total": 0, "current": 0, "error": 0, "errorList": [] }, "pages": { "total": 6, "current": 6, "error": 0, "errorList": [] } }, "source": { "name": "Magento", "url": "http://45.32.109.166/magento193", "connection": "KitConnect", "imageUrl": "https://demo.next-cart.com/service/5533_v176c/skin/image/carts/magento.png" }, "status": "Finished", "target": { "name": "WooCommerce", "url": "http://45.32.109.166/wordpress58", "connection": "KitConnect", "imageUrl": "https://demo.next-cart.com/service/5533_v176c/skin/image/carts/woocommerce.png" } } delete x.url; delete x._id; return x;
new obj
let x = { "url": "ssss", "_id": "asdsadasdasda", "ongoing": "", "progress": { "taxes": { "total": 2, "current": 2, "error": 0, "errorList": [] }, "categories": { "total": 4, "current": 4, "error": 0, "errorList": [] }, "products": { "total": 11, "current": 11, "error": 0, "errorList": [] }, "customers": { "total": 6, "current": 6, "error": 6, "errorList": [ "ERROR: Customer john@gmail.com import failed, Id source: 1, Response: The email-user already exists!", "ERROR: Customer evelyn@gmail.com import failed, Id source: 2, Response: The email-user already exists!", "ERROR: Customer imbluedata@gmail.com import failed, Id source: 3, Response: The email-user already exists!", "ERROR: Customer admin@gmail.com import failed, Id source: 4, Response: The email-user already exists!", "ERROR: Customer harry@gmail.com import failed, Id source: 5, Response: The email-user already exists!", "ERROR: Customer test1test2@xxx.ru import failed, Id source: 6, Response: The email-user already exists!" ] }, "orders": { "total": 3, "current": 3, "error": 0, "errorList": [] }, "reviews": { "total": 0, "current": 0, "error": 0, "errorList": [] }, "pages": { "total": 6, "current": 6, "error": 0, "errorList": [] } }, "source": { "name": "Magento", "url": "http://45.32.109.166/magento193", "connection": "KitConnect", "imageUrl": "https://demo.next-cart.com/service/5533_v176c/skin/image/carts/magento.png" }, "status": "Finished", "target": { "name": "WooCommerce", "url": "http://45.32.109.166/wordpress58", "connection": "KitConnect", "imageUrl": "https://demo.next-cart.com/service/5533_v176c/skin/image/carts/woocommerce.png" } } let a = { ongoing: x.ongoing, progress: x.progress, source: x.source, target: x.target, status: x.status } return a;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
new obj

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 133 on Android

View result in a separate tab

Test name	Executions per second
delete	855941.6 Ops/sec
new obj	1773603.9 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a benchmarking test for JavaScript object creation. The test consists of two variants: "new obj" and "delete". The objective is to compare the execution time of these two variants.

**Test Variants**

1. **"new obj"`**: This variant creates a new object using the `let` keyword, assigning it properties from another object (`x`) using destructuring assignment.
2. **"delete"`**: This variant removes all references to the original object `x`, effectively deleting it from memory.

**Key Differences**

* In "new obj", a new object is created and assigned to a variable `a`.
* In "delete", the original object `x` is not deleted; instead, its properties are reassigned to another variable `a`.

**Execution Time Comparison**

The latest benchmark result shows that:

* "new obj" executed 68.8% faster than "delete", with an average of approximately 169 executions per second.
* Both variants have the same browser, device platform, operating system, and raw UA string.

**Explanation**

This difference in execution time can be attributed to several factors:

* **Memory allocation**: In "new obj", a new object is allocated on the heap, whereas in "delete", only references are updated. This may involve fewer operations.
* **Object property access**: When accessing properties of `x` in "new obj", the browser needs to search for the properties in the object's prototype chain, which can be slower than direct property access.
* **Garbage collection**: The JavaScript engine might perform garbage collection more frequently when an object is deleted, leading to additional overhead.

**Best Practices**

For optimal performance:

* Use `let` or `const` declarations to avoid unnecessary memory allocation.
* Minimize object property access and reduce the number of iterations.
* Consider using caching mechanisms to reduce the frequency of garbage collection.

Related benchmarks:

delete vs new obj (version: 0)

Comparing performance of: delete vs new obj

Created: 4 years ago by: Guest

Jump to the latest result

delete

new obj

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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