Benchmark: Small but maybe empty Array versus Small Object (Creation wise)

Tests:

Array
let array = []; for (let i = 0 ; i < 10 ; i++) { const index = Math.floor (Math.random () * 10); array[index] = 1; }
Object
let object = {}; for (let i = 0 ; i < 10 ; i++) { const index = Math.floor (Math.random () * 10); object[index] = 1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array
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 dive into the world of MeasureThat.net and explore what's being tested in this specific benchmark.

**What is being tested?**

The provided benchmark compares two approaches: creating an array versus creating an object using JavaScript. The test cases are designed to measure which approach is faster when:

1. Creating a small but potentially empty array.
2. Creating a small but potentially empty object.

The benchmark definition json specifies the script preparation code and HTML preparation code, which are left blank in this case. This means that the only thing being executed is the JavaScript code provided in the `Benchmark Definition` section.

**Options compared**

Two options are being compared:

1. **Array**: Creating an array using a for loop to populate it with random values.
2. **Object**: Creating an object using a for loop to populate it with random values.

**Pros and Cons of each approach:**

*   **Array Approach**
    *   Pros:
        *   Arrays are typically more efficient in JavaScript due to their implementation as arrays of elements.
        *   Array operations can be faster when dealing with large datasets or sparse data structures.
    *   Cons:
        *   When creating an empty array, the initial size allocation may lead to overhead if not done efficiently (in this case, the loop populates the array).
*   **Object Approach**
    *   Pros:
        *   Objects are more flexible and can be used as a dictionary or hash table.
        *   Object literals can be more concise and easier to read for simple data structures.
    *   Cons:
        *   When creating an empty object, the initial size allocation may also lead to overhead.

**Special JS features or syntax**

In this benchmark, no special JavaScript features or syntax are being tested. The code provided is standard JavaScript that can be run in any compatible environment.

**Library usage**

Neither of the test cases uses a specific library, so there's nothing to report on in terms of library usage.

**Other considerations**

When measuring the performance of array vs object creation, other factors such as:

*   Cache behavior: How do browsers cache arrays and objects?
*   Garbage collection: Can array or object garbage collection impact performance?
*   Browser-specific optimizations: Are there browser-specific optimizations for array or object allocation?

These are interesting considerations when benchmarking these approaches.

**Other alternatives**

If you're interested in exploring other benchmarks, here are some alternatives:

*   MeasureThat.net's "Array vs Object" benchmark
*   The JavaScript benchmarking framework, Jest
*   The Browser Benchmarking Tool by Google

Related benchmarks:

Small but maybe empty Array versus Small Object (Creation wise) (version: 0)

Comparing performance of: Array vs Object

Created: 2 years ago by: Guest

Jump to the latest result

Array

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):