Benchmark: object key vs array find

Script Preparation code:

var itemKey = 100;

var objContainer = {};
var arrContainer = [];

for (let i = 1; i <= 100000; i++) {
  objContainer[i.toString()] = i;
  arrContainer.push(i);
}

Tests:

object key
objContainer[itemKey];
array find
arrContainer.find(containerItem => containerItem === itemKey);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object key
array find

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks to compare the performance of different approaches for various tasks.

The provided benchmark tests two approaches:

1.  **Object Key Lookup**: This approach uses an object literal (`objContainer`) to store values, and then looks up a specific value by its key.
2.  **Array Find**: This approach uses an array (`arrContainer`) with a custom `find` function to search for a specific value.

**Object Key Lookup Approach**

This approach involves:

*   Creating a large object literal (`objContainer`) with 100,000 keys and corresponding values using a `for` loop.
*   Looking up a specific key-value pair by accessing the object's property directly (`objContainer[itemKey]`).
*   Measuring the performance of this lookup operation.

**Array Find Approach**

This approach involves:

*   Creating a large array (`arrContainer`) with 100,000 elements using a `for` loop.
*   Defining a custom `find` function to search for a specific value in the array based on a callback function (`containerItem => containerItem === itemKey`).
*   Measuring the performance of this search operation.

**Pros and Cons**

### Object Key Lookup Approach

Pros:

*   **Efficient Memory Usage**: Using an object literal can lead to more efficient memory usage compared to arrays, especially for large datasets.
*   **Fast Property Access**: Direct property access in objects is typically faster than searching through arrays using a custom function.

Cons:

*   **Less Flexible**: Objects are more limited in terms of how you can search or manipulate their contents compared to arrays.
*   **Browser Support**: Some older browsers might not support object literals or have issues with certain features like `let` and `const`.

### Array Find Approach

Pros:

*   **More Flexibility**: Arrays offer a wide range of methods for searching, filtering, manipulating, and modifying data.

Cons:

*   **Slower Performance**: Searching through arrays can be slower than direct property access in objects due to the overhead of iterating over elements.
*   **Memory Usage**: Arrays require more memory compared to object literals, especially for large datasets.

**Other Considerations**

When choosing between these approaches, consider factors such as:

*   The specific use case: If you need fast lookup and modification, an object key approach might be better. For flexible array operations, the array find approach could be preferable.
*   Browser support: Object literals are generally more supported across browsers than custom array functions.

**Library Used**

Neither of these approaches relies on a specific library; however, some libraries like Lodash or Ramda can simplify array manipulation and filtering tasks using their built-in functions (`find`, `filter`, etc.).

**Special JS Feature/Syntax**

This benchmark does not specifically test any special JavaScript features or syntax. However, the use of `let` and `const` declarations for variable scope, as well as template literals like `\r\n\r\n` for code formatting, showcase how modern JavaScript best practices are used in the provided script preparation code.

**Alternatives**

Other alternatives to benchmark JavaScript performance include:

*   V8 (JavaScript engine) benchmarks: Many web developers and researchers use V8's built-in benchmarking tools or create their own custom benchmarks using Node.js.
*   Browser-specific benchmarking tools: Some popular browsers, like Google Chrome, provide developer tools for benchmarking JavaScript performance in the browser.
*   Online benchmarking platforms: Websites like jsperf, benchmarkjs, and Benchmark are designed to help developers test and compare the performance of different JavaScript libraries and implementations.

Keep in mind that each platform might have its unique features and considerations, so it's always a good idea to consult their documentation for specific details.

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 YaBrowser/24.7.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
object key	10631227.0 Ops/sec
array find	215415.4 Ops/sec

Related benchmarks:

object key vs array find (version: 3)

Comparing performance of: object key vs array find

Created: one month ago by: Registered User

Jump to the latest result

object key

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):