Benchmark: test shift - MeasureThat.net

Tests:

1
let entries = [] for (let i = 0; i < 100000; ++i) { entries.push(i); } for (let i = 0; i < 100000; ++i) { const a = entries.shift(); }
2
let entries = [] for (let i = 0; i < 100000; ++i) { entries.push(i); } for (let i = 0; i < 100000; ++i) { const a = entries.shift(); }

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:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
1	0.2 Ops/sec
2	0.2 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**What is being tested?**

The benchmark defines two test cases that measure the performance of shifting elements from an array in JavaScript. The test cases are identical, but with slightly different variations.

**Options compared:**

In this benchmark, there are only two options compared:

1. Shifting elements using `entries.shift()`
2. No shifting ( likely a baseline or no-op operation)

The difference between these two options is that `entries.shift()` removes and returns the first element from the array, whereas no shifting does nothing.

**Pros and cons of each approach:**

**Shifting elements using `entries.shift()`**

Pros:

* This approach is generally efficient, as it uses a built-in method to remove and return an element from the array.
* It's a common pattern in JavaScript programming.

Cons:

* When the array is large, shifting elements multiple times can lead to performance issues due to the repeated removal of elements.
* This approach may not be suitable for arrays with many duplicates or gaps in data.

**No shifting (baseline)**

Pros:

* No overhead, as no operations are performed on the array.
* Suitable for arrays with many duplicates or gaps in data.

Cons:

* May not accurately represent real-world scenarios where elements need to be shifted.
* Not very informative about the performance of `entries.shift()`.

**Other considerations:**

* The benchmark does not account for factors like array resizing, array type (e.g., sparse vs. dense), or specific browser optimizations that may affect performance.
* The test cases do not cover edge cases, such as empty arrays, arrays with only one element, or extremely large arrays.

**Library usage:**

There is no explicit library mentioned in the benchmark definition or test cases. However, it's likely that the `Array` class and its methods (e.g., `push()`, `shift()`) are being used under the hood.

**Special JS feature/syntax:**

None of the test cases use any special JavaScript features or syntax beyond the standard language.

**Alternatives:**

If you want to create a similar benchmark, here's an alternative approach:

* Use a different data structure, such as `ArrayDeque` (if available) or a custom implementation.
* Include additional variations, such as:
	+ Using `entries.splice()` instead of `entries.shift()`
	+ Adding random noise to the array elements before shifting
	+ Measuring performance under different conditions (e.g., with a large array size or multiple iterations)
	+ Comparing performance across different browsers or platforms

Related benchmarks:

test shift (version: 0)

Comparing performance of: 1 vs 2

Created: one year ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):