Benchmark: Associative object array VS array.find

Script Preparation code:

o = {};
a = [];

for (var i = 0; i<= 10000; i++){
	a.push({'id' : ''+i, 'name' : 'name_'+i, 'firstname' : 'firstname_'+i});
  	o[''+i] = {'id' : ''+i, 'name' : 'name_'+i, 'firstname' : 'firstname_'+i}
}

Tests:

Get index of object
name = o['1234'].name;
Get array.find
name = a.find(t => t.id == '1234');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Get index of object
Get array.find

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36

Browser/OS: Chrome 84 on Windows

View result in a separate tab

Test name	Executions per second
Get index of object	1610998.4 Ops/sec
Get array.find	101828.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Definition JSON**

The benchmark is comparing two approaches to retrieve an object from an associative array (object) versus an array using the `find` method:

1. **Associative Object Array**: The script creates an empty object (`o`) and an empty array (`a`). It then populates the array with 10,000 objects, each with `id`, `name`, and `firstname` properties. The script then attempts to retrieve an object by its `id` using the syntax `o['1234'].name;`. This approach uses a key lookup in the associative array.
2. **Array Find**: The script creates an empty array (`a`) and populates it with 10,000 objects, each with `id`, `name`, and `firstname` properties. The script then attempts to retrieve an object by its `id` using the `find` method with a callback function: `t => t.id == '1234'`. This approach uses the `find` method to search for an object that matches the specified condition.

**Options Compared**

The two options being compared are:

1. **Associative Object Array Lookup**: This approach uses a key lookup in the associative array to retrieve the desired object.
2. **Array Find Method**: This approach uses the `find` method with a callback function to search for an object that matches the specified condition.

**Pros and Cons**

**Associative Object Array Lookup**

Pros:

* Typically faster and more efficient, especially for small to medium-sized datasets
* Can be more cache-friendly, as the entire associative array is loaded into memory

Cons:

* May not scale well for very large datasets, as it requires a significant amount of memory to store the entire associative array
* Can be slower for arrays with many duplicate keys or key collisions

**Array Find Method**

Pros:

* Can handle larger datasets and provides better performance for searching multiple conditions
* Does not require loading the entire dataset into memory, making it more scalable

Cons:

* Typically slower than associative object array lookup for small to medium-sized datasets
* May have higher overhead due to the use of a callback function and iterating over the array

**Library Usage**

The `Array.prototype.find()` method is a standard JavaScript method that searches for an element in an array that satisfies a provided testing function. In this benchmark, it's used with a callback function to search for an object that matches the specified condition.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. The focus is on comparing two different approaches to retrieving an object from an associative array versus an array.

**Alternative Approaches**

Other alternatives to these two options might include:

1. **Using a map (or dictionary) instead of an associative array**: This could potentially provide better performance and scalability for large datasets.
2. **Using a more efficient data structure, such as a trie or suffix tree**: These data structures are optimized for fast lookups and may provide better performance than the current options.
3. **Caching or memoization**: Caching or memoizing the results of previous lookups could potentially improve performance by avoiding repeated computations.

However, these alternatives might not be relevant to this specific benchmark, which is focused on comparing two simple approaches to retrieving an object from an associative array versus an array using the `find` method.

Related benchmarks:

Associative object array VS array.find (version: 0)

Get index of object vs Get array.find

Comparing performance of: Get index of object vs Get array.find

Created: 4 years ago by: Guest

Jump to the latest result

Get index of object

Get array.find

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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