Benchmark: Object keys vs _.values

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Tests:

Object values
var a = { a: 1, b: 2, c: 3}; Object.keys(a).map(key => a[key]);
_.values
var a = { a: 1, b: 2, c: 3}; _.values(a);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object values
_.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):

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

**Benchmark Definition**

The benchmark is testing two different approaches to accessing object values: using `Object.keys()` with a map function, and using Lodash's `_values()` method. The goal is to compare the performance of these two methods in retrieving object values.

**Comparison Options**

There are two comparison options:

1. **`Object.keys(a).map(key => a[key])`**: This approach uses the `Object.keys()` method to get an array of object keys, and then maps over this array to retrieve the corresponding object values.
2. **`_.values(a)`**: This approach uses Lodash's `_values()` method, which returns a function that takes an object as input and returns its values.

**Pros and Cons**

1. **`Object.keys(a).map(key => a[key])`**
	* Pros:
		+ Portable across different JavaScript engines and environments.
		+ Can be used with any object, not just Lodash.
	* Cons:
		+ Requires two function calls (one for `Object.keys()` and one for the map function).
		+ May incur overhead due to the map function's creation of an array.
2. **`_.values(a)`**
	* Pros:
		+ Specifically optimized for object value retrieval by Lodash.
		+ Can be faster than the first approach, especially for large objects.
	* Cons:
		+ Requires including Lodash in the benchmark execution.
		+ May not work as expected with certain types of objects or JavaScript engines.

**Lodash Library**

The `_values()` method is part of the Lodash library, which provides a collection of utility functions. In this case, `_values()` returns a function that takes an object as input and returns its values. This allows for concise and readable code to access object values.

**Special JS Feature/Syntax**

None mentioned in the provided benchmark definition. The code appears to be standard JavaScript syntax.

**Alternative Approaches**

If you need to compare performance of accessing object values, consider using other approaches:

1. **Using `Object.values()` (ES6)**: This method returns an array of an object's own enumerable property values.
2. **Using a for...of loop**: You can use a for...of loop to iterate over the object's key-value pairs and access their values.

Here is some sample code that uses these alternative approaches:
```javascript
// Using Object.values()
var obj = {a: 1, b: 2, c: 3};
for (let value of Object.values(obj)) {
    // Process the value
}

// Using a for...of loop
for (let [key, value] of Object.entries(obj)) {
    // Process the key-value pair
}
```
Keep in mind that these alternatives may have different performance characteristics compared to the original approach.

Related benchmarks:

Object keys vs _.values (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: Object values vs _.values

Created: 6 years ago by: Guest

Jump to the latest result

Object values

_.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):