Benchmark: Array fill method vs for loop3

Tests:

For Loop fill
let arrayTest = new Array(10000000); for (let i = 0; i < arrayTest.length; i++){ arrayTest[i] = undefined; }
Array Fill
let arrayTest = new Array(10000000).fill(undefined);
aasdasd
let arrayTest = []; for (let i = 0; i < 10000000; i++){ arrayTest[i] = undefined; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For Loop fill
Array Fill
aasdasd

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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I'll explain the benchmark and its results in detail.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test on MeasureThat.net. The test compares the performance of three different approaches to fill an array with undefined values: using a traditional `for` loop, using the `fill()` method (introduced in ECMAScript 2015), and using an empty array.

**Approaches Compared**

1. **Traditional For Loop**: This approach uses a `for` loop to iterate over the array's length and assigns `undefined` to each element.
2. **Array Fill Method**: This approach uses the `fill()` method to set all elements of the array to `undefined`.
3. **Empty Array Approach**: This approach creates an empty array and then iterates over its length using a `for` loop, assigning `undefined` to each element.

**Pros and Cons of Each Approach**

1. **Traditional For Loop**:
	* Pros: Well-established syntax, easy to understand.
	* Cons: Can be slower due to the overhead of incrementing the loop counter and checking the array's length.
2. **Array Fill Method**:
	* Pros: Faster, as it uses a built-in method optimized for performance.
	* Cons: Requires JavaScript 5+ support (ECMAScript 2015) and may not work in older browsers or environments.
3. **Empty Array Approach**:
	* Pros: Similar to the `fill()` method approach but avoids the need for JavaScript 5+ support.
	* Cons: May be slower due to the overhead of creating an empty array.

**Library and Special Features**

None of these approaches rely on any specific libraries or special features in this benchmark. However, keep in mind that if you were to use a library like Lodash, which provides utility functions, you might not see the same performance differences between these approaches.

**Other Considerations**

When running benchmarks like this one, it's essential to consider factors such as:

* Environment: Browser and environment-specific features can affect performance.
* Optimizations: Compilers and browsers may apply optimizations that impact performance.
* Other variables: Memory allocation, garbage collection, and other system resources might influence results.

**Alternatives**

If you're looking for alternative approaches or want to explore different scenarios, consider the following:

* **Using native WebAssembly**: Modern browsers support WebAssembly (WASM), which can be used to execute optimized, compiled code. This might lead to even faster performance compared to traditional JavaScript methods.
* **Native array operations**: Some platforms and libraries provide native array operations that can bypass JavaScript's interpreter and execute directly on the CPU.
* **Loop unrolling or other optimization techniques**: For loop-intensive benchmarks, you might consider applying optimization techniques like loop unrolling, which can improve performance by reducing the number of iterations.

Keep in mind that these alternatives may require additional setup and expertise.

Related benchmarks:

Array fill method vs for loop3 (version: 0)

Array fill method vs for loop performance validation

Comparing performance of: For Loop fill vs Array Fill vs aasdasd

Created: 3 years ago by: Guest

Jump to the latest result

For Loop fill

Array Fill

aasdasd

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):