Benchmark: object isEmpty test2

Script Preparation code:

var obj1 = {
  foo: 'bar'
};
var obj0 = {};

function isEmpty1(obj) {
  return !!obj && Object.keys(obj).length === 0 && obj.constructor === Object;
}

function isEmpty2(obj) {
  if (!obj || obj.constructor !== Object) {
    return false;
  }

  for (var key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) {
      return false;
    }
  }

  return true;
}

​x
 
var obj1 = {  foo: 'bar'};var obj0 = {};​function isEmpty1(obj) {  return !!obj && Object.keys(obj).length === 0 && obj.constructor === Object;}​function isEmpty2(obj) {  if (!obj || obj.constructor !== Object) {    return false;  }​  for (var key in obj) {    if (Object.prototype.hasOwnProperty.call(obj, key)) {      return false;    }  }​  return true;}

Tests:

isEmpty1

var result1 = [];
for (let i = 0; i < 100; i += 1) {
  result1[i] = i % 2 ? isEmpty1(obj1) : isEmpty1(obj0);
}

 
var result1 = [];for (let i = 0; i < 100; i += 1) {  result1[i] = i % 2 ? isEmpty1(obj1) : isEmpty1(obj0);}

isEmpty2

var result2 = [];
for (let i = 0; i < 100; i += 1) {
  result2[i] = i % 2 ? isEmpty2(obj1) : isEmpty2(obj0);
}

 
var result2 = [];for (let i = 0; i < 100; i += 1) {  result2[i] = i % 2 ? isEmpty2(obj1) : isEmpty2(obj0);}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
isEmpty1
isEmpty2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36

Browser/OS: Chrome 96 on Windows

View result in a separate tab

Test name	Executions per second
isEmpty1	29526.9 Ops/sec
isEmpty2	29051.8 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

I'll break down the provided benchmark definition, test cases, and latest benchmark result to explain what's being tested.

Benchmark Definition

The benchmark measures the performance of two different approaches for checking if an object is empty:

isEmpty1(obj): This function returns true if the object has no keys (i.e., it's an empty object), and its constructor is also Object. The purpose of this check is to ensure that we're not comparing the object with null or any other non-object value.
isEmpty2(obj): This function uses a for...in loop to iterate over the object's keys. If any key exists, it returns false, indicating that the object is not empty.

Options Compared

The two approaches are compared in terms of performance, specifically:

Which approach is faster?
Does one approach have better cache locality than the other?

Pros and Cons

isEmpty1(obj):
- Pros: Simple and efficient, as it only checks if the object has no keys.
- Cons: It may not cover all cases (e.g., comparing with null), which might lead to false positives or negatives.
isEmpty2(obj):
- Pros: More comprehensive, as it checks for existing keys in addition to checking the constructor.
- Cons: The for...in loop may introduce more overhead due to iteration and potential caching issues.

Library

None of the test cases use any external libraries or frameworks.

Special JS Feature or Syntax

There's no explicit mention of special JavaScript features or syntax being used. However, it's worth noting that the for...in loop in isEmpty2(obj) uses a legacy syntax (prior to ECMAScript 2015).

Other Considerations

When interpreting benchmark results, keep in mind:

The benchmark only measures performance for specific use cases (checking if an object is empty).
Other factors like memory allocation, garbage collection, or branch prediction might influence the actual performance difference between the two approaches.

Alternatives

If you want to explore alternative approaches, consider these options:

Using Object.keys(obj).length === 0 instead of checking the constructor (as in isEmpty1(obj)).
Utilizing modern JavaScript features like Array.prototype.every() or Array.prototype.filter() to check if all keys exist.
Implementing a custom hash function or using a library like Lodash to optimize object emptiness checks.

Keep in mind that the best approach depends on the specific use case and performance requirements of your application.

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition, test cases, and latest benchmark result to explain what's being tested.

**Benchmark Definition**

The benchmark measures the performance of two different approaches for checking if an object is empty:

1. `isEmpty1(obj)`: This function returns `true` if the object has no keys (i.e., it's an empty object), and its constructor is also `Object`. The purpose of this check is to ensure that we're not comparing the object with `null` or any other non-object value.
2. `isEmpty2(obj)`: This function uses a for...in loop to iterate over the object's keys. If any key exists, it returns `false`, indicating that the object is not empty.

**Options Compared**

The two approaches are compared in terms of performance, specifically:

* Which approach is faster?
* Does one approach have better cache locality than the other?

**Pros and Cons**

1. **`isEmpty1(obj)`**:
	* Pros: Simple and efficient, as it only checks if the object has no keys.
	* Cons: It may not cover all cases (e.g., comparing with `null`), which might lead to false positives or negatives.
2. **`isEmpty2(obj)`**:
	* Pros: More comprehensive, as it checks for existing keys in addition to checking the constructor.
	* Cons: The for...in loop may introduce more overhead due to iteration and potential caching issues.

**Library**

None of the test cases use any external libraries or frameworks.

**Special JS Feature or Syntax**

There's no explicit mention of special JavaScript features or syntax being used. However, it's worth noting that the `for...in` loop in `isEmpty2(obj)` uses a legacy syntax (prior to ECMAScript 2015).

**Other Considerations**

When interpreting benchmark results, keep in mind:

* The benchmark only measures performance for specific use cases (checking if an object is empty).
* Other factors like memory allocation, garbage collection, or branch prediction might influence the actual performance difference between the two approaches.

**Alternatives**

If you want to explore alternative approaches, consider these options:

1. Using `Object.keys(obj).length === 0` instead of checking the constructor (as in `isEmpty1(obj)`).
2. Utilizing modern JavaScript features like `Array.prototype.every()` or `Array.prototype.filter()` to check if all keys exist.
3. Implementing a custom hash function or using a library like Lodash to optimize object emptiness checks.

Keep in mind that the best approach depends on the specific use case and performance requirements of your application.

Related benchmarks:

object isEmpty test2 (version: 2)

Comparing performance of: isEmpty1 vs isEmpty2

Created: 3 years ago by: Registered User

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