Benchmark: Object.entries - MeasureThat.net

Script Preparation code:

var obj = {};
for (let i = 0; i < 100000; i++) {
  obj[i] = i;
}

var ObjToArr = (obj)=> {
  if (obj == null) { // null 또는 undefined 검사
    throw new TypeError('Cannot convert undefined or null to object');
  }

  const ownProps = Object.keys(obj); // 객체의 자체 열거 가능한 속성 키를 가져옵니다.
  const length = ownProps.length;
  const result = new Array(length);

  for (let i = 0; i < length; i++) {
    result[i] = [ownProps[i], obj[ownProps[i]]]; // [key, value] 쌍을 생성합니다.
  }

  return result;
}

var ObjToArr2 = (obj)=> {
  if (obj == null) { // null 또는 undefined 검사
    throw new TypeError('Cannot convert undefined or null to object');
  }

  const result = [];
  Object.keys(obj).forEach((key) => result.push([key, obj[key]]));
  
  return result;
}

var ObjToArr3 = (obj)=> {
  if (obj == null) { // null 또는 undefined 검사
    throw new TypeError('Cannot convert undefined or null to object');
  }

  const result = [];

  Object.keys(obj).forEach((key) => result.push([key, obj[key]]));
  
  return result;
}

var ObjToArr4 = (obj)=> {
  if (obj == null) { // null 또는 undefined 검사
    throw new TypeError('Cannot convert undefined or null to object');
  }

  const result = []
  for(const key of Object.keys(obj)) result.push([key, obj[key]]);
  
  return result;
}


var ObjToArr5 = (obj)=> {
  if (obj == null) return;

  const result = []
  for(const key in obj) result.push([key, obj[key]]);
  
  return result;
}

Tests:

ObjToArr4
ObjToArr4(obj);
Object.entries
Object.entries(obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ObjToArr4
Object.entries

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
ObjToArr4	250.6 Ops/sec
Object.entries	165.2 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down what's being tested in the provided JSON and explain the options, pros, cons, and other considerations.

**Benchmark Definition**

The benchmark is testing two approaches for converting an object into an array of key-value pairs:

1. `ObjToArr4`: uses a `for...of` loop to iterate over the object's keys.
2. `Object.entries`: uses the built-in `Object.entries()` method to get an array of key-value pairs.

**Options Comparison**

Both approaches aim to achieve the same result: converting an object into an array of key-value pairs. Here are the pros and cons of each approach:

**`ObjToArr4`**

Pros:

* More flexible, as it allows for custom iteration logic.
* May be more efficient in certain cases (e.g., when iterating over a large dataset).

Cons:

* Requires manual loop implementation, which can be error-prone.
* May have performance overhead due to the custom loop.

**`Object.entries`**

Pros:

* Built-in method, reducing code duplication and potential errors.
* Efficient and optimized by the JavaScript engine.

Cons:

* Less flexible, as it only provides a specific iteration mechanism.
* May not perform well for very large datasets or complex objects.

**Other Considerations**

When choosing between these approaches, consider the following factors:

* Code readability and maintainability: `Object.entries` is generally more readable and easier to understand due to its built-in nature.
* Performance: Both approaches should be comparable in terms of performance. However, `Object.entries` might have a slight advantage due to its optimized implementation by the JavaScript engine.

**Library or Framework**

None explicitly mentioned in this benchmark.

**Special JS Feature or Syntax**

The `for...of` loop used in `ObjToArr4` is a special syntax introduced in ECMAScript 2015 (ES6). It allows iterating over iterable objects, such as arrays and objects. The `Object.entries()` method is also part of ES6, but its usage is more straightforward compared to the custom implementation in `ObjToArr4`.

**Alternative Approaches**

If you wanted to explore alternative approaches for converting an object into an array of key-value pairs, some options include:

* Using `Array.prototype.reduce()`: This approach would involve reducing the array of keys to a single value (the first key) and then using that value as the index to access the corresponding value in the original object.
* Using `Array.prototype.map()`: Similar to `reduce()`, but with more flexibility in terms of iteration logic.

Keep in mind that these alternatives might not provide the same level of efficiency or readability as `Object.entries()`.

I hope this explanation helps you understand what's being tested in the provided JSON!

Related benchmarks:

Object.entries (version: 0)

Comparing performance of: ObjToArr4 vs Object.entries

Created: one year ago by: Guest

Jump to the latest result

ObjToArr4

Object.entries

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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