Benchmark: Object.values vs Object.keys iteration perf

Tests:

Object.values
const myObj = {}; for (let i = 0; i < 1000; i += 1) { myObj[i] = { key: i, value: 1 }; } Object.values(myObj).forEach(function(o) { const key = o.key; const value = o.value; });
Object.keys
const myObj = {}; for (let i = 0; i < 1000; i += 1) { myObj[i] = { key: i, value: 1 }; } Object.keys(myObj).forEach(function(id) { const o = myObj[id]; const key = o.key; const value = o.value; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.values
Object.keys

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Linux

View result in a separate tab

Test name	Executions per second
Object.values	102225.1 Ops/sec
Object.keys	50957.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and the pros and cons of each approach.

**Benchmark Definition**

The benchmark definition is a JSON object that contains information about the test case. In this case, there are two individual test cases:

1. "Object.values"
2. "Object.keys"

Both test cases involve creating an object with 1000 properties, iterating over the object using `Object.values` or `Object.keys`, and then accessing each property.

**Options Compared**

The options being compared are:

* `Object.values`
* `Object.keys`

These two methods have different use cases and performance characteristics.

**Pros and Cons of Each Approach**

1. **Object.values**
	* Pros:
		+ Returns an array of values directly, eliminating the need for indexing.
		+ Can be faster when iterating over large objects with known property names.
	* Cons:
		+ May incur additional overhead due to array creation.
2. **Object.keys**
	* Pros:
		+ Returns an array of property names, which can be useful in certain situations (e.g., object iteration).
		+ Does not create a new array, reducing memory allocation and garbage collection overhead.
	* Cons:
		+ Requires indexing to access each property value.

**Library and Purpose**

There is no library explicitly mentioned in the benchmark definition. However, it's worth noting that `Object.values` and `Object.keys` are built-in methods in JavaScript, making them a part of the language itself.

**Special JS Feature or Syntax**

No special features or syntax are used in these test cases.

**Other Considerations**

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

* Do you need to access property values directly? Use `Object.values`.
* Do you need to iterate over object properties using their names? Use `Object.keys`.

In general, if you're working with large objects and need to iterate quickly, `Object.values` might be a better choice. However, if you need to perform other operations on the property names (e.g., filtering or mapping), `Object.keys` is likely a better option.

**Alternatives**

Other alternatives for iterating over object properties include:

* Using `for...in` loops, which iterate over object's own enumerable properties.
* Using a library like Lodash, which provides methods like `forEach`, `map`, and `filter` for working with objects.
* Using a framework or library that provides optimized object iteration mechanisms.

Keep in mind that these alternatives might have different performance characteristics and trade-offs compared to the built-in `Object.values` and `Object.keys` methods.

Related benchmarks:

Object.values vs Object.keys iteration perf (version: 0)

Comparing performance of: Object.values vs Object.keys

Created: 2 years ago by: Guest

Jump to the latest result

Object.values

Object.keys

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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