Benchmark: Splice vs Assignation

Script Preparation code:

var myArray = [1,2,3,4,5,6,7,8,9]

Tests:

Splice
myArray.splice(0, myArray.length, ...[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]);
Assignation
myArray = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
Assignation

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.

Measuring the performance of different approaches to modifying an array in JavaScript can be an interesting benchmark.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which includes:

*   A name for the benchmark ("Splice vs Assignation")
*   A description (null)
*   Script preparation code: This is a snippet of JavaScript that creates and populates an array called `myArray` with values from 1 to 20.
*   Html preparation code (null)

The script preparation code sets up a specific scenario for the benchmark, which involves creating a large array.

**Individual Test Cases**

There are two test cases defined in the JSON:

1.  **Splice**: This test case uses the `splice` method to replace the contents of the `myArray` with a new array containing values from 1 to 20.
2.  **Assignation**: This test case uses the assignment operator (`=`) to reassign the value of the `myArray` variable to a new array.

**Options Compared**

The two test cases compare different approaches to modifying an array:

*   **Splice**: Uses the `splice` method, which modifies the original array in place.
*   **Assignation**: Uses the assignment operator (`=`), which creates a new array and assigns it to the variable.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

*   **Splice**:
    *   Pros:
        *   More efficient, as it modifies the original array in place.
        *   Can be faster for large arrays.
    *   Cons:
        *   Modifies the original array, which can lead to unexpected side effects.
        *   May not work correctly if used with certain data structures (e.g., `Set`).
*   **Assignation**:
    *   Pros:
        *   Creates a new array, which avoids modifying the original array.
        *   Can be safer and more predictable.
    *   Cons:
        *   Slower than `splice`, as it creates a new array and assigns it to the variable.
        *   May lead to increased memory usage.

**Library Used**

The benchmark definition does not explicitly mention any libraries. However, it's likely that the script preparation code uses a JavaScript runtime environment (e.g., V8) to execute the code.

**Special JS Feature or Syntax**

There is no special feature or syntax mentioned in the provided JSON. The benchmark focuses on comparing two basic approaches to modifying an array: using `splice` and assignment operator (`=`).

**Other Alternatives**

Some alternative approaches to modifying arrays include:

*   Using a library like Lodash, which provides utility functions for working with arrays (e.g., `lodash.includes`, `lodash.forEachIn`).
*   Using the `map()` method to create a new array based on an existing array.
*   Using the `forEach()` method to iterate over an array and perform modifications directly.

Keep in mind that these alternatives may have different trade-offs regarding performance, memory usage, and code readability.

Related benchmarks:

Splice vs Assignation (version: 0)

Comparing performance of: Splice vs Assignation

Created: 2 years ago by: Guest

Jump to the latest result

Splice

Assignation

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):