Benchmark: Object.values vs Reduce

Tests:

Object.values
var a = { a: 1, b: 2, c: 3}; return Object.values(a);
Keys, Reduce
var a = { a: 1, b: 2, c: 3}; return Object.keys(a).reduce((prev, key) => { prev.push(a[key]); return prev; },[]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.values
Keys, Reduce

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.values	19476534.0 Ops/sec
Keys, Reduce	23447594.0 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 is being tested.

**Benchmark Overview**

The benchmark compares the performance of two approaches to access values in an object:

1. `Object.values`
2. Using `Object.keys` with the `reduce()` method

**What are Object.values and Object.keys?**

`Object.values` returns an array of a given object's own enumerable property values.

`Object.keys` returns an array of a given object's own enumerable property keys (i.e., names).

The `reduce()` method applies a function to each element in the array and reduces it to a single value. In this case, we're using it to concatenate the values from the `Object.keys(a)` array into a single array.

**Options Compared**

We have two options being compared:

1. **`Object.values`**: Directly access the object's values as an array.
2. **Keys, Reduce**: Use `Object.keys()` and then apply `reduce()` to concatenate the key names into an array of values.

**Pros and Cons of Each Approach**

* **`Object.values`**:
	+ Pros: Simple, efficient, and straightforward.
	+ Cons: Requires that the object has a numerical property (i.e., its keys must be numbers), which might not always be the case.
* **Keys, Reduce**:
	+ Pros: Works with objects that have non-numerical keys. However, it's more complex and potentially slower than `Object.values`.
	+ Cons: Requires two additional function calls (`Object.keys()` and `reduce()`).

**Other Considerations**

When choosing between these approaches, consider the following:

* If you know that your object will always have numerical keys, `Object.values` is likely a better choice.
* If you need to handle objects with non-numerical keys, `Keys, Reduce` might be a better option.

**Library and Special JS Features**

Neither of these approaches relies on any specific library or special JavaScript features beyond what's built into the language.

Related benchmarks:

Object.values vs Reduce (version: 0)

Comparing performance of: Object.values vs Keys, Reduce

Created: 6 years ago by: Guest

Jump to the latest result

Object.values

Keys, Reduce

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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