Benchmark: find by value of object in array VS find by key of object (ver2)

Script Preparation code:

var array = Array.from(Array(10001), (_,x) => ({ id: x, value: x * 10 }));
// a = [{ id: 0, value: 0 }, { id: 1, value: 10 }, { id: 2, value: 20 }, ..., { id: 10000, value: 100000 }]
var object = array.reduce((cum, { id, value }) => ({ ...cum, [id]: value }), {});
// o = { 0: 0, 1: 10, 2: 20, 3: 30, ..., 10000: 100000 };
var randomIds = Array.from(Array(100000), () => Math.floor(Math.random() * 10000));

Tests:

filter by id from array
randomIds.forEach(id => array.filter(a => a.id === id)[0])
find by id from array
randomIds.forEach(id => array.find(a => a.id === id))
find by key of object
randomIds.forEach(id => object[id])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
filter by id from array
find by id from array
find by key of 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.

**Benchmark Description**

The benchmark tests three different approaches to find an element in an array and an object:

1. **Filter by ID**: Using `Array.prototype.filter()` method with a callback function that checks if the `id` property of each array element matches the given `id`.
2. **Find by ID**: Using `Array.prototype.find()` method with a callback function that checks if the `id` property of each array element matches the given `id`.
3. **Find by Key**: Using object bracket notation (`[key]`) to access the value associated with a specific key in the `object`.

**Options Compared**

The benchmark compares the performance of these three approaches:

* Filter by ID (using `Array.prototype.filter()`): This approach iterates through each element in the array and checks if it matches the given `id`. It returns the first matching element.
* Find by ID (using `Array.prototype.find()`): This approach also iterates through each element in the array but uses a more efficient algorithm to find the first matching element. It stops iterating as soon as it finds a match.
* Find by Key: This approach directly accesses the value associated with the given key in the object using bracket notation.

**Pros and Cons**

Here's a brief overview of the pros and cons of each approach:

1. **Filter by ID (Array.prototype.filter())**:
	* Pros: Simple, easy to implement, works well for small arrays.
	* Cons: Can be slow for large arrays because it iterates through all elements before finding the first match.
2. **Find by ID (Array.prototype.find())**:
	* Pros: Efficient for large arrays because it stops iterating as soon as it finds a match.
	* Cons: May throw an error if no element matches the given `id`.
3. **Find by Key (object bracket notation)**:
	* Pros: Fast and efficient because it directly accesses the value associated with the key in the object.
	* Cons: Only works for objects with existing keys, may not be as intuitive as other approaches.

**Library/Function Used**

The benchmark uses:

1. `Array.prototype.filter()` method from JavaScript's built-in `Array` prototype.
2. `Array.prototype.find()` method from JavaScript's built-in `Array` prototype.
3. Bracket notation (`[key]`) which is a part of the JavaScript object syntax.

**Special JS Feature/Syntax**

The benchmark uses `Math.random()` to generate random IDs, which is a standard JavaScript feature for generating random numbers.

**Other Alternatives**

If you need alternative approaches, consider:

1. **Using a library like Lodash**: Lodash provides more efficient and convenient ways to filter and find elements in arrays.
2. **Using a different data structure**: If performance is critical, using a data structure like a Map or a Trie might be more suitable than an array.

Keep in mind that the choice of approach depends on your specific use case, data size, and performance requirements.

Related benchmarks:

find by value of object in array VS find by key of object (ver2) (version: 1)

Comparing performance of: filter by id from array vs find by id from array vs find by key of object

Created: 3 years ago by: Registered User

Jump to the latest result

filter by id from array

find by id from array

find by key of 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):