Benchmark: arrayloops2 - MeasureThat.net

HTML Preparation code:

<script>
var arr1 = [];
var arr2 = [];
var arr3 = [];
</script>

Tests:

shift
arr1.push(Math.random()); if (arr1.length > 5) arr1.shift();
manual
const newEntry = Math.random(); if (arr2.length < 5) { arr2.push(newEntry); } else { for (let i = 1; i < 5; i++) { arr2[i - 1] = arr2[i]; } arr2[4] = newEntry; }
splice
const newEntry = Math.random(); if (arr3.length >= 5) arr3.splice(0, 1); arr3 = [...arr3, newEntry];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
shift
manual
splice

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 and its test cases.

**Overview**

The provided benchmark, `arrayloops2`, tests three different approaches for removing or adding elements to an array using various JavaScript methods. The goal is to determine which approach performs better in terms of execution time.

**Test Cases**

There are three test cases:

1. **shift**: This test case uses the built-in `Array.prototype.shift()` method to remove elements from the beginning of an array.
2. **manual**: This test case manually removes and adds elements to the array using a loop. The array is initially populated with 5 random numbers, and then 6 additional random numbers are added to it. If the array already has more than 5 elements, the first 5 elements are removed in reverse order.
3. **splice**: This test case uses the `Array.prototype.splice()` method to remove an element from the beginning of the array.

**Library Used**

None of the test cases use any external libraries.

**Special JavaScript Features or Syntax**

The `manual` test case uses a loop and conditional statements, which are standard JavaScript syntax. However, it's worth noting that this approach may not be as efficient as using built-in methods like `shift()` or `splice()`, which are optimized for performance by the JavaScript engine.

**Approaches Compared**

The three approaches compared in this benchmark are:

* **Built-in method**: `Array.prototype.shift()` (used in the `shift` test case)
	+ Pros: Optimized by the JavaScript engine, concise syntax
	+ Cons: May not be as efficient for large arrays or complex operations
* **Manual loop**: The `manual` test case uses a loop to remove and add elements to the array.
	+ Pros: Flexibility, can handle complex operations
	+ Cons: May be slower due to the overhead of manual iteration
* **Built-in method with additional operation**: `Array.prototype.splice()` (used in the `splice` test case)
	+ Pros: Can perform multiple operations at once, optimized by the JavaScript engine
	+ Cons: May have additional overhead compared to a simple `shift()` call

**Other Alternatives**

If you wanted to run this benchmark using different approaches, here are some alternatives:

* **Using `pop()` instead of `shift()`**: This would remove elements from the end of the array instead of the beginning.
* **Using `unshift()`**: This would add elements to the beginning of the array instead of removing elements from the beginning.
* **Using a custom implementation**: You could implement your own algorithm for removing or adding elements to an array, but this would likely be less efficient than using built-in methods like `shift()` or `splice()`.
* **Using a different data structure**: Instead of using arrays, you could use other data structures like linked lists or trees, which might offer different performance characteristics.

In summary, the benchmark compares three approaches for removing or adding elements to an array: using the built-in `Array.prototype.shift()` method, a manual loop approach, and using the `Array.prototype.splice()` method. The results of this benchmark can help determine which approach is most efficient in terms of execution time.

Related benchmarks:

arrayloops2 (version: 0)

Comparing performance of: shift vs manual vs splice

Created: 5 years ago by: Guest

Jump to the latest result

shift

manual

splice

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):