Benchmark: Object.keys for length checking

Script Preparation code:

var obj10 = {};
var obj100 = {};
var obj500 = {};
var obj1000 = {};

for (let i=0; i < 10; i++) {
  obj10[`key${i}`] = i;
}
for (let i=0; i < 100; i++) {
  obj100[`key${i}`] = i;
}
for (let i=0; i < 500; i++) {
  obj500[`key${i}`] = i;
}
for (let i=0; i < 1000; i++) {
  obj500[`key${i}`] = i;
}

Tests:

obj 10 keys
Object.keys(obj10).length
obj 100 keys
Object.keys(obj100).length
obj 500 keys
Object.keys(obj500).length
obj 1k keys
Object.keys(obj1000).length

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
obj 10 keys
obj 100 keys
obj 500 keys
obj 1k keys

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Definition Overview**

The provided JSON represents a JavaScript microbenchmarking test case for measuring the performance of `Object.keys()` method in different scenarios.

**Script Preparation Code**

The script preparation code creates 4 objects (`obj10`, `obj100`, `obj500`, and `obj1000`) with increasing sizes (10, 100, 500, and 1000 properties respectively). Each object has a unique key pattern using template literals (`key${i}`).

**Html Preparation Code**

There is no HTML preparation code provided.

**Test Cases**

The test cases are defined as an array of objects, each containing:

* `Benchmark Definition`: The specific JavaScript expression to be measured (e.g., `Object.keys(obj10).length`)
* `Test Name`: A descriptive name for the test case

In this case, there are 4 test cases:

1. `obj 10 keys`
2. `obj 100 keys`
3. `obj 500 keys`
4. `obj 1k keys`

**Options Compared**

The benchmark is comparing the performance of `Object.keys()` method in different object sizes:

* Small objects (`obj10`)
* Medium objects (`obj100`)
* Large objects (`obj500`)
* Very large objects (`obj1000`)

This comparison allows users to evaluate the performance of `Object.keys()` method under various conditions.

**Pros and Cons**

Pros:

* Allows users to compare the performance of `Object.keys()` method in different scenarios
* Provides a realistic representation of real-world use cases

Cons:

* May not reflect edge cases or extreme scenarios
* Can be affected by other factors like browser optimization, caching, etc.

**Library and Purpose**

The `Object.keys()` method is a built-in JavaScript function that returns an array of strings containing the property names of an object. In this benchmark, it's used to measure the performance of object iteration and property access.

**Special JS Feature or Syntax**

None mentioned in this explanation.

**Other Alternatives**

Other alternatives for measuring object size and performance could include:

* Using a library like `lodash` with its `keys()` function
* Implementing custom object iteration using `for...in` loop
* Using `Object.size()` method (not supported in older browsers)

However, the built-in `Object.keys()` method is widely supported and provides a straightforward way to measure object size and performance.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
obj 10 keys	9792928.0 Ops/sec
obj 100 keys	917739.5 Ops/sec
obj 500 keys	81080.5 Ops/sec
obj 1k keys	10257098.0 Ops/sec

Related benchmarks:

Object.keys for length checking (version: 0)

Comparing performance of: obj 10 keys vs obj 100 keys vs obj 500 keys vs obj 1k keys

Created: one month ago by: Guest

Jump to the latest result

obj 10 keys

obj 100 keys

obj 500 keys

obj 1k keys

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 24 days ago):