Benchmark: Object.keys vs Object.entries vs Object.values for determining size

Script Preparation code:

function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (var i = 0; i < 5; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}

window.parentObj = {};

for (let i = 0; i < 5000; i++) {
	window.parentObj[makeid()] = makeid();
}

Tests:

Object.entries
Object.entries(window.parentObj)
Object.keys
Object.keys(window.parentObj)
Object.values
Object.values(window.parentObj)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.entries
Object.keys
Object.values

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 is tested, compared, and their pros/cons.

**What is being tested:**

The benchmark measures which method is faster to determine the size of an object in JavaScript:

1. `Object.keys()`
2. `Object.entries()`
3. `Object.values()`

These methods are used to iterate over the properties of an object and return them as arrays.

**Options compared:**

* `Object.keys()`: Returns an array of a given object's own enumerable property names.
* `Object.entries()`: Returns an array of a given object's own enumerable key-value pairs.
* `Object.values()`: Returns an array of a given object's own enumerable values.

**Pros and Cons:**

* `Object.keys()`:
	+ Pros: Lightweight, fast, and widely supported.
	+ Cons: May not be suitable for objects with large numbers of properties or property names that are long strings.
* `Object.entries()`:
	+ Pros: Returns both keys and values, making it a convenient choice for objects with complex data structures. However, it may have performance implications due to the additional processing required.
	+ Cons: May be slower than `Object.keys()` for large objects or objects with simple property names.
* `Object.values()`:
	+ Pros: Returns only the values, which can be beneficial when working with objects that have a large number of keys. However, it may not provide as much information about the object's structure as `Object.entries()`.
	+ Cons: May be slower than `Object.keys()` for small objects or objects with simple property names.

**Library and purpose:**

There is no external library used in this benchmark. The methods being tested are built-in to JavaScript.

**Special JS feature or syntax:**

There are no special features or syntax used in this benchmark, other than the use of `Math.floor()` and `Math.random()` for generating random property names.

**Considerations:**

The benchmark's results may be influenced by factors such as:

* The size and complexity of the objects being tested.
* The type of data stored in the object (e.g., numbers, strings, booleans).
* The performance characteristics of the specific JavaScript engine and browser being used.

**Alternative approaches:**

Other methods for determining the size of an object might include:

* Using `Object.getOwnPropertyNames()` or `Object.getOwnPropertyDescriptors()` to retrieve a list of all properties, including non-enumerable ones.
* Using a library like Lodash or Underscore.js to provide additional utility functions for working with objects.

However, these alternative approaches may not be as efficient or straightforward as the built-in methods being tested in this benchmark.

Related benchmarks:

Object.keys vs Object.entries vs Object.values for determining size (version: 0)

For measuring the fastest way to measure a length of an object

Comparing performance of: Object.entries vs Object.keys vs Object.values

Created: 2 years ago by: Guest

Jump to the latest result

Object.entries

Object.keys

Object.values

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):