Benchmark: Object.values vs mapping id to object

Script Preparation code:

var fruits = {
    "orange-id": {
        name: "Orange",
        taste: "sweet"
    },
    "apple-id": {
        name: "Apple",
        taste: "sour"
    }
};
var fruitIds = ["orange-id", "apple-id"];

Tests:

Object.values
Object.values(fruits);
Mapping ids to object
fruitIds.map(id => fruits[id]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.values
Mapping ids to object

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 definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark definition consists of two scripts:

1. `var fruits = {...};`: This script creates an object called `fruits` with some properties, including `orange-id` and `apple-id`, each containing additional properties like `name` and `taste`.
2. The `Object.values()` method: This method returns an array containing all the values of a given object.
3. The `fruitIds.map(id => fruits[id])` expression: This is using the `map()` function to create a new array where each element is obtained by looking up the corresponding value in the `fruits` object.

**What are being compared?**

The benchmark is comparing two approaches:

1. Using the `Object.values()` method to get an array of values directly from the `fruits` object.
2. Mapping over the `fruitIds` array to look up each ID in the `fruits` object and retrieve its corresponding value.

**Pros and Cons of each approach:**

1. **Object.values()**:
	* Pros:
		+ More efficient, as it avoids an additional loop over the array.
		+ May be faster due to optimized internal implementation.
	* Cons:
		+ Less intuitive, as it returns a direct copy of all values in the object.
2. **Mapping over `fruitIds`**:
	* Pros:
		+ More explicit and readable, as it clearly shows the intention of retrieving each value by ID.
	* Cons:
		+ May be slower due to the additional loop and lookups.

Other considerations:

* The benchmark uses a relatively small dataset (`fruits` object), which might not accurately represent real-world performance differences. Larger datasets would likely reveal more pronounced differences between the two approaches.
* The `map()` function is used with a simple callback, which might not be representative of more complex scenarios where the callback is more involved.

**Library usage**

There is no explicit library being used in this benchmark definition. However, modern JavaScript environments like Chrome often use internal optimizations and implementations that may affect performance differences between these two approaches.

**Special JS feature or syntax**

There are no special features or syntaxes being tested here (e.g., async/await, Promises, `let`/`const` declarations).

**Alternatives**

Other approaches to achieve the same result could be:

* Using a library like Lodash (`_.map()`), which provides an efficient and readable way to map over arrays.
* Implementing a custom loop or using a different data structure (e.g., a Set) to retrieve values by ID.

Keep in mind that these alternatives would likely introduce additional overhead, so the performance difference between `Object.values()` and mapping over `fruitIds` might still be noticeable.

Related benchmarks:

Object.values vs mapping id to object (version: 0)

Comparing performance of: Object.values vs Mapping ids to object

Created: 3 years ago by: Registered User

Jump to the latest result

Object.values

Mapping ids to object

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):