Benchmark: unshift01 - MeasureThat.net

Script Preparation code:

a = [1,2,3,4,5]

Tests:

[123].concat(a)
[123].concat(a)
console.log(a.length)
console.log(a.length)
unshift
a.unshift(123)
console.log(a.length) - 2
console.log(a.length)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
[123].concat(a)
console.log(a.length)
unshift
console.log(a.length) - 2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36

Browser/OS: Chrome 88 on Linux

View result in a separate tab

Test name	Executions per second
[123].concat(a)	985691.6 Ops/sec
console.log(a.length)	17691.1 Ops/sec
unshift	39499.0 Ops/sec
console.log(a.length) - 2	18199.9 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark, `unshift01`, tests the performance of JavaScript's array methods: `concat()`, `unshift()`, and `console.log()` with various operations.

**Script Preparation Code**
```javascript
a = [1,2,3,4,5]
```
This code initializes an array `a` containing five elements using a simple assignment statement.

**Html Preparation Code**
The "Html Preparation Code" field is empty in this benchmark definition. This means that no HTML-related code or setup is provided.

**Individual Test Cases**

Each test case consists of two parts:

1. **Benchmark Definition**: A string representing the JavaScript code to be executed.
2. **Test Name**: The name given to the test case, which corresponds to the Benchmark Definition.

The four test cases are:

* `[123].concat(a)` : Concatenates array `a` with a new array containing a single element `123`.
* `console.log(a.length)` : Logs the length of array `a` to the console.
* `a.unshift(123)` : Shifts the first element of array `a` by one position, inserting `123` at the beginning.
* `console.log(a.length) - 2`: Logs the result of subtracting `2` from the length of array `a`.

**Libraries and Special Features**

None of the benchmark definitions use external libraries. However, they do employ some special features:

* **Array indexing**: The use of `[123]` in `concat()` refers to a specific index in array `a`. This assumes that JavaScript's array indexing is 0-based, meaning the first element is at index 0.
* **console.log()**: The `console.log()` function is used to output values to the console. In this case, it's used to display the length of array `a` or a modified value.

**Approaches and Considerations**

The test cases cover different aspects of JavaScript's array methods:

1.  **Concatenation**: `[123].concat(a)` tests the performance of concatenating arrays.
2.  **Unshifting**: `a.unshift(123)` evaluates the efficiency of shifting elements in an array.
3.  **Logging array length**: `console.log(a.length)` and `console.log(a.length) - 2` assess the speed of accessing and manipulating array lengths.

In terms of approach, these test cases:

*   **Use simple operations**: The benchmark definitions use straightforward arithmetic and indexing to keep the tests focused on the specific JavaScript methods being tested.
*   **Avoid complex logic**: No unnecessary loops or conditional statements are used in the benchmark definitions, ensuring that the focus remains on the performance of the array methods themselves.

**Alternatives**

To create a similar benchmark, you could consider adding more test cases that cover different aspects of JavaScript's array methods, such as:

*   **Array iteration**: Testing the performance of `forEach()`, `map()`, or other iteration methods.
*   **Array manipulation**: Evaluating the efficiency of modifying arrays using `push()`, `pop()`, or other methods.

Keep in mind that creating a comprehensive benchmark suite requires careful consideration of various factors, including the specific use cases, hardware configurations, and JavaScript versions being targeted.

Related benchmarks:

unshift01 (version: 0)

Comparing performance of: [123].concat(a) vs console.log(a.length) vs unshift vs console.log(a.length) - 2

Created: 3 years ago by: Guest

Jump to the latest result

[123].concat(a)

console.log(a.length)

unshift

console.log(a.length) - 2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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