Benchmark: testaa - MeasureThat.net

Script Preparation code:

var obj = {
  a:1,
  b:2,
  c:3
};

Tests:

1
const { a, ...rest } = obj;
2
const a = Object.assign({}, obj); delete obj.a;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest 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 JSON data and explain what's being tested in each benchmark.

**Benchmark Definition**

The `Script Preparation Code` section contains a JavaScript code snippet that defines an object `obj` with three properties: `a`, `b`, and `c`. This code is used to prepare the test environment for the microbenchmark.

**Test Cases**

There are two individual test cases:

1. **Test Case 1: Destructuring Assignment**
The `Benchmark Definition` uses a destructuring assignment syntax to extract the value of `obj.a` into a variable named `a`. The rest of the object is assigned to an undefined variable (hence the `...rest` syntax). This test case measures the performance of this specific JavaScript feature.
2. **Test Case 2: Object Assign and Delete**
The `Benchmark Definition` uses the `Object.assign()` method to create a new object that copies the properties from `obj`. Then, it deletes the property `a` from the new object using the `delete` operator. This test case measures the performance of this specific JavaScript operation.

**Options Compared**

In each test case, two options are being compared:

* In Test Case 1:
	+ Option 1: Destructuring assignment (`const { a, ...rest } = obj;`)
	+ Option 2: Not specified (assuming the baseline)
* In Test Case 2:
	+ Option 1: `Object.assign()` with property deletion (`const a = Object.assign({}, obj);\ndelete obj.a;`)
	+ Option 2: Not specified (assuming the baseline)

**Pros and Cons**

Here are some pros and cons of each approach:

Test Case 1 (Destructuring Assignment):

Pros:

* More concise and readable code
* Can lead to better performance due to fewer allocations

Cons:

* May be slower due to the overhead of creating a new variable (even if it's just an undefined one)
* Limited support in older browsers or JavaScript engines

Test Case 2 (`Object.assign()` with property deletion):

Pros:

* Widely supported and optimized by modern browsers and JavaScript engines
* Can lead to better performance due to the use of native `Object.prototype.hasOwnProperty.call` checks

Cons:

* More verbose code
* May allocate more memory due to the creation of a new object

**Library Usage**

In Test Case 2, the `Object.assign()` method is used with the `const a = ...` syntax. This syntax is part of the ECMAScript standard (ES6+) and is supported by most modern JavaScript engines.

**Special JS Feature or Syntax**

There are no special features or syntaxes being tested in these benchmarks. The focus is on measuring the performance of specific JavaScript operations.

**Alternative Alternatives**

If you're interested in exploring alternative alternatives, here are a few options:

* For Test Case 1 (Destructuring Assignment), you could test using `const { a } = obj;` instead, which eliminates the need for creating an undefined variable.
* For Test Case 2 (`Object.assign()` with property deletion), you could test using the spread operator (`{ ...obj }`) or a library like Lodash's `cloneDeep()` function to create a new object.

Keep in mind that these alternatives may introduce performance trade-offs or limitations, so it's essential to consider your specific use case and requirements before exploring them.

Related benchmarks:

testaa (version: 0)

Comparing performance of: 1 vs 2

Created: 5 years ago by: Guest

Jump to the latest result

1

2

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):