Benchmark: Keys.length vs Values.length

Script Preparation code:

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

Tests:

Object.keys
console.log(Object.keys(obj).length)
Object.values
console.log(Object.values(obj).length)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys
Object.values

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in this benchmark.

**Benchmark Definition**

The provided JSON defines two individual test cases:

1. `Keys.length vs Values.length`
2. `Object.keys` and `Object.values`

Let's break down the first one, as it seems more complex.

The script preparation code creates an object `obj` with 6 properties (`a`, `b`, `c`, `d`, `e`, and `f`) each containing a single property `id` and a value `1`. This object is then passed to the benchmarking framework.

The purpose of this test case appears to be measuring the performance difference between:

* Getting the length of an array containing the keys of the object (`Object.keys(obj).length`)
* Getting the length of an array containing the values of the object (`Object.values(obj).length`)

**Options being compared**

In this test case, two approaches are being compared:

1. `Object.keys()`: Returns an array of a given object's own enumerable property names.
2. `Object.values()`: Returns an array of a given object's own enumerable property values.

The performance difference between these two methods is likely to be small, as both return arrays with the same number of elements (the number of properties in the object). However, there might be some minor differences due to the internal implementation details of these methods or browser-specific optimizations.

**Pros and Cons**

Both `Object.keys()` and `Object.values()` have their pros and cons:

Pros of `Object.keys()`:

* Can return an array of property names, which might be useful in certain scenarios.
* Might be slightly faster since it only needs to traverse the object's property names.

Cons of `Object.keys()`:

* Returns an array of strings (property names), whereas `Object.values()` returns an array of values.
* Might not be as efficient if the object has a large number of properties, since it needs to iterate over all properties to get their names.

Pros of `Object.values()`:

* Returns an array of actual values, which might be more convenient in certain scenarios.
* Can potentially be faster for objects with many properties, since it only needs to traverse the object's value storage.

Cons of `Object.values()`:

* Only returns the values of enumerable properties, which means some properties (e.g., inherited ones) are ignored.
* Might not be as efficient if the object has a large number of properties, since it needs to iterate over all properties to get their values.

**Library usage**

There is no explicit library mentioned in the benchmark definition. However, the `Object.keys()` and `Object.values()` methods are part of the built-in JavaScript API, which means they are native to the language.

**Special JS features or syntax**

None are explicitly used in this benchmark.

Related benchmarks:

Keys.length vs Values.length (version: 0)

Comparing performance of: Object.keys vs Object.values

Created: 3 years ago by: Guest

Jump to the latest result

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):