Benchmark: Object.entries VS Object.keys

Script Preparation code:

var obj = {
    'a': 1,
    'b': 1,
    'c': 1,
    'd': 1,
    'e': 1,
    'f': 1,
    'g': 1
};

Tests:

Object.keys
for (var i=10000; i > 0; i--) { Object.keys(obj).forEach(key => console.log(key)); }
Object.entires
for (var i=10000; i > 0; i--) { Object.entries(obj).forEach(key => console.log(key)); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys
Object.entires

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 benchmark and explain what's being tested.

**Benchmark Definition**

The website uses JSON data to define benchmarks, which includes:

1. **Script Preparation Code**: This is the JavaScript code that sets up the environment for the benchmark. In this case, it creates an object `obj` with 7 properties.
2. **Html Preparation Code**: This is not applicable in this benchmark, as there is no HTML preparation code provided.
3. **Description**: There is no description provided for this benchmark.

**Individual Test Cases**

There are two test cases:

1. **Object.keys**
	* Benchmark Definition: A `for` loop that iterates from 10000 to 0, and inside the loop, it calls `Object.keys(obj)` and logs each key using `forEach`.
2. **Object.entries**
	* Benchmark Definition: A `for` loop that iterates from 10000 to 0, and inside the loop, it calls `Object.entries(obj)` and logs each key-value pair using `forEach`.

**Comparison**

Both test cases use a similar approach:

1. They create an object `obj` with 7 properties.
2. They iterate from 10000 to 0 in a `for` loop.
3. Inside the loop, they call either `Object.keys(obj)` or `Object.entries(obj)`, and log each result using `forEach`.

**Pros and Cons**

1. **Object.keys**:
	* Pros: Generally faster than `Object.entries` because it only returns an array of property names, without their corresponding values.
	* Cons: It may not be suitable for cases where you need to iterate over both keys and values simultaneously.
2. **Object.entries**:
	* Pros: It provides a convenient way to iterate over both keys and values simultaneously.
	* Cons: It's generally slower than `Object.keys` because it returns an array of key-value pairs.

**Library/External Feature**

There is no library or external feature being tested in this benchmark. Both test cases rely on built-in JavaScript features.

**Other Considerations**

When choosing between `Object.keys` and `Object.entries`, consider the following:

* If you only need to iterate over property names, `Object.keys` might be a better choice.
* If you need to iterate over both keys and values simultaneously, `Object.entries` is likely a better option.

**Alternatives**

If you're looking for alternatives or additional test cases, some possible options could include:

* Comparing performance with other iteration methods, such as using `for...in`, `Array.prototype.forEach`, or `reduce()`.
* Testing performance with different object sizes or complexities.
* Using a larger dataset or more complex object structures to stress-test the benchmark.

Related benchmarks:

Object.entries VS Object.keys (version: 0)

Comparing performance of: Object.keys vs Object.entires

Created: 4 years ago by: Guest

Jump to the latest result

Object.keys

Object.entires

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):