Benchmark: deconstruct vs delete

Script Preparation code:

var obj = {
  foo: 1,
  bar: 2,
}

Tests:

delete
let fullObj = obj; if (obj.foo) { let foo = obj.foo; delete obj.foo; }
deconstruct
const {foo, ...rest} = obj;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
deconstruct

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its options.

**Benchmark Overview**

The given benchmark, "deconstruct vs delete", measures the performance difference between two approaches: `delete` and object destructuring (`const {foo, ...rest} = obj;`). The test creates an object with a single property `foo` and checks if it exists before deleting or destructuring it.

**Options Compared**

The two options compared are:

1. **Delete**: This approach uses the `delete` keyword to delete the `foo` property from the original object `obj`.
2. **Object Destructuring**: This approach uses object destructuring to extract the value of `foo` into a new variable `foo`, and then reassigns the rest of the properties to an object using the spread operator (`...rest = obj`). The original object remains unchanged.

**Pros and Cons**

*   **Delete**:
    *   Pros: Simple and straightforward, easy to understand.
    *   Cons: Can lead to unexpected behavior if not used carefully (e.g., deleting a property that is still referenced elsewhere in the code).
*   **Object Destructuring**:
    *   Pros: More concise and expressive, can be more efficient since it avoids creating a new variable.
    *   Cons: May be less intuitive for developers without prior experience with object destructuring.

**Library Usage**

The benchmark uses no external libraries. However, it relies on the JavaScript engine's built-in `delete` operator to delete properties from objects.

**Special JS Feature or Syntax**

This benchmark does not use any special JavaScript features or syntax beyond what is part of the standard language. It's designed to be accessible to developers with varying levels of familiarity with JavaScript.

**Other Alternatives**

Some alternative approaches could include:

*   Using `Object.assign()` to update the object and remove the property.
*   Utilizing a library like Lodash, which provides a `deleteProperty` function for safely removing properties from objects.
*   Implementing a custom solution using a different data structure or approach.

The choice of approach depends on personal preference, performance requirements, and the specific use case.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser/OS: Chrome 108 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
delete	7426289.0 Ops/sec
deconstruct	1856491.0 Ops/sec

Related benchmarks:

deconstruct vs delete (version: 0)

Comparing performance of: delete vs deconstruct

Created: 5 years ago by: Guest

Jump to the latest result

delete

deconstruct

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):