Benchmark: Limiting array length2

Tests:

1
let arr = []; for (let i = 0; i < 10000; i++) { arr.push(Date.now()); arr.length = Math.min(arr.length, 100) }
2
let arr = []; for (let i = 0; i < 10000; i++) { arr.push(Date.now()); if (arr.length > 100) arr.length = 100; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

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 break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark is simply defined as "Limiting array length2". This means that we are measuring how well JavaScript engines can handle creating, pushing elements into an array, and limiting its length.

However, when looking at the individual test cases, it becomes clear that these tests don't just measure limiting array length. They also check for performance differences in two slightly different approaches:

1. `arr.length = Math.min(arr.length, 100)` (Test Case "2")
2. `if (arr.length > 100) arr.length = 100` (Test Case "1")

**Options Compared**

The two test cases compare the performance of these two methods for limiting array length.

Pros and Cons:

* **Math.min() approach:**
	+ Pros:
		- More concise and readable
		- May be faster due to optimized JavaScript engine behavior
	+ Cons:
		- Requires JavaScript engine support for built-in `Math.min()` function
		- May not work in older browsers or environments without this optimization
* **If-statement approach:**
	+ Pros:
		- More explicit and self-contained logic
		- Works in all browsers and environments, regardless of `Math.min()` support
	+ Cons:
		- Less concise and more verbose

**Library and Special JS Features**

Neither test case explicitly uses any external libraries or special JavaScript features beyond standard ECMAScript syntax.

**Alternative Approaches**

Other alternatives to limit array length might include:

* Using a library like Lodash, which provides a `limitBy` function for this purpose
* Utilizing a caching mechanism, like memoization, to avoid frequent length checks
* Implementing a custom solution using bitwise operations or other low-level techniques

However, these alternatives would likely have different performance characteristics and may not be as straightforward as the two test cases.

**Benchmark Preparation Code**

The provided benchmark preparation code is empty (`"Script Preparation Code": null`), which suggests that any necessary setup or initialization should occur in the JavaScript engine itself. In this case, it's simply creating an array and pushing a large number of Date.now() values into it while limiting its length.

Related benchmarks:

Limiting array length2 (version: 0)

Comparing performance of: 1 vs 2

Created: 5 years ago by: Guest

Jump to the latest result

1

2

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):