Benchmark: unshift vs push 100

Script Preparation code:

var a = [
   0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
  10,11,12,13,14,15,16,17,18,19,
  20,21,22,23,24,25,26,27,28,29,
  30,31,32,33,34,35,36,37,38,39,
  40,41,42,43,44,45,46,47,48,49,
  50,51,52,53,54,55,56,57,58,59,
  60,61,62,63,64,65,66,67,68,69,
  70,71,72,73,74,75,76,77,78,79,
  80,81,82,83,84,85,86,87,88,89,
  90,91,92,93,94,95,96,97,98,99,
];

Tests:

push
a.push('a');
unshiftt
a.unshift('a')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
unshiftt

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the provided benchmark definition and test cases.

**Benchmark Definition:**

The benchmark is comparing the performance of `push` and `unshift` methods on an array `a`. The `Script Preparation Code` defines the initial state of the array, which consists of 100 elements. The `Html Preparation Code` is empty, suggesting that this benchmark doesn't rely on any specific HTML environment.

**Options Being Compared:**

Two options are being compared:

1. `push`: This method appends a new element to the end of an array.
2. `unshiftt` (note the typo): This method inserts a new element at the beginning of an array.

**Pros and Cons of Each Approach:**

1. **Push**:
	* Pros: Generally more efficient, as it doesn't require shifting elements to make room for the new element. It also updates the length of the array in a single operation.
	* Cons: May require more memory allocations if the array grows significantly, depending on the JavaScript engine's internal buffer management.
2. **Unshiftt**:
	* Pros: Can be useful when inserting elements at the beginning of an array is necessary (e.g., in certain data structures or algorithms).
	* Cons: Typically slower than `push`, as it requires shifting elements to make room for the new element. This can lead to more cache misses and slower performance.

**Library Usage:**

There doesn't appear to be any explicit library usage in these benchmark definitions.

**Special JS Feature/Syntax:**

The only notable syntax feature used here is a typo (`unshiftt` instead of `unshift`). The `push` method, on the other hand, is a standard JavaScript method that's widely supported.

**Other Considerations:**

When designing benchmarks like this, it's essential to consider factors such as:

* **Array size**: Larger arrays may exhibit different performance characteristics due to memory allocation and caching effects.
* **Language and engine specifics**: Different JavaScript engines (e.g., V8, SpiderMonkey) or languages (e.g., TypeScript) might have varying performance characteristics for these methods.
* **Cache behavior**: Modern JavaScript engines are optimized for cache-friendly access patterns. The performance differences between `push` and `unshift` may be influenced by cache locality.

**Alternative Benchmarks:**

Other benchmark ideas could include:

1. Comparing the performance of other array methods, such as `concat`, `splice`, or `slice`.
2. Testing the performance of different array size ranges (e.g., 10 to 1000 elements).
3. Evaluating the impact of various JavaScript engine settings (e.g., `-O` flag) on the performance of these methods.
4. Comparing the performance of `push` and `unshift` in different scenarios, such as when dealing with large arrays or inserting elements at arbitrary positions.

By exploring these alternative benchmark ideas, you can gain a deeper understanding of how JavaScript engines optimize array operations and what factors influence their performance.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
push	9979827.0 Ops/sec
unshiftt	6427901.0 Ops/sec

Related benchmarks:

unshift vs push 100 (version: 0)

Comparing performance of: push vs unshiftt

Created: one year ago by: Guest

Jump to the latest result

push

unshiftt

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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