Benchmark: wadadada - MeasureThat.net

Tests:

new Array fill
console.log("new Array fill"); ((times, start, time, num) => { for(let i = 0; i < num; i++) { start = performance.now(); const arr = (new Array(10_000_000)).fill(1); time = performance.now() - start; console.log(time); times[i] = time; } const ave = times.reduce((pre, cur) => pre + cur) / num; console.log("ave", ave); })([], 0, 0, 10);
for init
console.log("for init"); ((times, start, time, num) => { for(let i = 0; i < num; i++) { const arr = []; start = performance.now(); for(let i = 0; i < 10_000_000; i++) { arr[i] = 1|0; } time = performance.now() - start; console.log(time); times[i] = time; } const ave = times.reduce((pre, cur) => pre + cur) / num; console.log("ave", ave); })([], 0, 0, 10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new Array fill
for init

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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Let's dive into the explanation of the provided benchmark.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents a single benchmark, which consists of two test cases: "new Array fill" and "for init". Each test case measures the performance of a specific JavaScript code snippet.

**Test Cases**

The first test case, "new Array fill", tests the performance of creating an array using the `new Array()` constructor and filling it with values. The code uses the `fill()` method to assign the value 1 to each element in the array.

The second test case, "for init", tests the performance of initializing an empty array using a traditional `for` loop and then populating it with values using the bitwise OR operator (`|`). This is done by assigning the value 1 to each index in the array using the expression `arr[i] = 1 | 0`.

**Comparison of Options**

Both test cases use similar approaches, but there are some differences:

* In "new Array fill", an array is created using the `new Array()` constructor and filled with values. This approach uses JavaScript's built-in array creation mechanism.
* In "for init", an empty array is initialized using a traditional `for` loop, which iterates over each index in the array and assigns the value 1 using the bitwise OR operator (`|`). This approach involves manual memory management and iteration.

**Pros and Cons of Each Approach**

* **new Array fill**: This approach has several pros:
	+ It's concise and readable.
	+ It uses JavaScript's built-in array creation mechanism, which is optimized for performance.
	+ It doesn't require manual memory management or iteration.
However, this approach also has some cons:
	+ It may not be as efficient as other approaches that use native arrays or buffers.
	+ The `fill()` method can be slower than manually assigning values to each element in the array.

* **for init**: This approach has several pros:
	+ It provides more control over memory management and iteration.
	+ It doesn't rely on JavaScript's built-in array creation mechanism, which may not be as efficient.
However, this approach also has some cons:
	+ It's less concise and readable than the `new Array()` constructor approach.
	+ Manual memory management can lead to performance issues if not done correctly.

**Library Usage**

Neither of the test cases uses a library explicitly. However, MeasureThat.net may use internal libraries or tools to facilitate benchmarking, such as JavaScript engines or profiling frameworks.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in these test cases. The code uses standard JavaScript constructs and operators.

**Alternatives**

Other approaches that could be used for benchmarking array creation and filling might include:

* Using native arrays or buffers (e.g., `Uint8Array`) instead of JavaScript's built-in arrays.
* Using a loop with a pointer or a buffer to manually iterate over the array elements.
* Using a third-party library or tool specifically designed for benchmarking array creation and filling performance.

Keep in mind that these alternatives might have their own pros and cons, and may not be suitable for all use cases. The `new Array()` constructor approach used in "new Array fill" is likely to be a good starting point for most use cases due to its simplicity and readability.

Related benchmarks:

wadadada (version: 0)

Comparing performance of: new Array fill vs for init

Created: 4 years ago by: Guest

Jump to the latest result

new Array fill

for init

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):