Benchmark: fill vs push multiple

Tests:

fill
let a = Array(600000).fill(16); let b = Array(600000).fill().map((_, idx) => 16 * idx);
push
let a = []; let b = []; for(let i = 0; i< 600000;i++) { a.push(16); b.push(i*16); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fill
push

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**What is being tested?**

MeasuresThat.net is testing two different approaches to create an array of 600,000 elements and fill it with a constant value (in this case, `16`). The two approaches are:

1. **`fill()` method**: Creating an empty array using `Array(600000).fill(16)`.
2. **`push()` method in a loop**: Creating an empty array `[]`, then looping 600,000 times to push `16` and another value (`i*16`) onto the end of the array.

**Options being compared**

The two approaches are being compared for performance differences.

**Pros and Cons:**

1. **`fill()` method**:
	* Pros:
		+ Faster execution time due to optimized implementation by the JavaScript engine.
		+ More concise and readable code.
	* Cons:
		+ May not work as expected in certain situations (e.g., when working with large arrays that don't fit in memory).
2. **`push()` method in a loop**:
	* Pros:
		+ More flexible and reusable, as it doesn't rely on the `fill()` method.
	* Cons:
		+ Longer execution time due to the looping overhead.
		+ Less concise and less readable code.

**Library usage**

None of the provided benchmark test cases uses any libraries.

**Special JavaScript features or syntax**

There are no special JavaScript features or syntax being used in these tests. However, it's worth noting that some modern JavaScript engines (like V8) have optimized implementations for certain array operations, which may affect performance.

**Other alternatives**

If you wanted to create an array of 600,000 elements and fill it with a constant value using alternative approaches, here are a few options:

1. **`Array.from()` method**: `Array.from(new Array(600000), () => 16)`
2. **`Map` object**: `new Map().set(16, new Array(600000).fill(0))`
3. **`reduce()` method**: `(arr, acc) => arr.reduce((acc, _, idx) => (acc[idx] = 16), {})`

Keep in mind that these alternatives may have different performance characteristics and may not be as concise or readable as the original `fill()` method.

I hope this explanation helps!

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36

Browser/OS: Chrome 98 on Windows

View result in a separate tab

Test name	Executions per second
fill	73.3 Ops/sec
push	60.9 Ops/sec

Related benchmarks:

fill vs push multiple (version: 0)

Comparing performance of: fill vs push

Created: 2 years ago by: Guest

Jump to the latest result

fill

push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):