Benchmark: Array.find vs Object

Script Preparation code:

var array = [];
var elements = 10000;

for (var i = 0; i < elements; i++) {
	array.push({
		index: i
	});
}

var arrayObject = {};

array.forEach(element => {
	arrayObject[element.index] = element;
});

Tests:

Array.find
let randomIndex = (Math.random() * (elements - 1)) | 0 let foundElement = array.find(element => element.index === randomIndex);
Object
let randomIndex = (Math.random() * (elements - 1)) | 0 let foundElement = arrayObject[randomIndex];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find
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):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is tested on that benchmark.

The test case measures the performance difference between two approaches: using `Array.prototype.find()` and accessing an object by index.

**Options Compared**

There are two options being compared:

1.  **`arrayObject[randomIndex]`**: This approach accesses the desired element in the `arrayObject` object by its index. It's a simple and straightforward way to get an element.

2.  **`array.find(element => element.index === randomIndex)`**: This approach uses the `Array.prototype.find()` method, which returns the first element in the array that satisfies the provided condition. In this case, it finds an element with an index matching `randomIndex`.

**Pros and Cons**

*   **`arrayObject[randomIndex]`**:
    *   **Pros:**
        *   Faster since it directly accesses the object by index.
        *   More straightforward to understand for those familiar with arrays.
    *   **Cons:**
        *   May not be as efficient if the array object is very large, due to potential overheads associated with accessing objects by property name.
*   **`array.find()`**:
    *   **Pros:**
        *   More flexible and easier to use for cases where the condition is more complex than a simple property equality check.
        *   Can be seen as more "JavaScript-like" since it leverages an array's built-in method.
    *   **Cons:**
        *   Generally slower due to the overhead of iterating over elements in the array and executing the callback function.

**Library/Script Used**

The script uses `Array.prototype.find()` which is a part of JavaScript's standard library. The `forEach()` method also used in the initial setup code, is another standard JavaScript method that iterates over an array or object.

**Special JS Feature/Syntax**

There is no special feature or syntax being tested here. It's purely about comparing two simple algorithmic approaches in a controlled environment.

**Other Alternatives**

If you needed to measure performance difference between other methods (e.g., `array.indexOf()`), you could consider adding more test cases, such as:

*   `array.indexOf(randomIndex)`
*   `for...of` loop

However, keep in mind that each additional test case will add complexity and potentially skew the results.

Related benchmarks:

Array.find vs Object (version: 0)

Comparing performance of: Array.find vs Object

Created: 7 years ago by: Guest

Jump to the latest result

Array.find

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):