Benchmark: arr.slice() vs spread operator

Script Preparation code:

var params = [ "hello", true, 7 , 3.03, "haha", false, null, undefined, 16];

Tests:

Array.prototype.slice
const other = params.slice();
spread operator
const other = [ ...params ];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.slice
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark definition is comparing two approaches to creating a copy of an array in JavaScript: `Array.prototype.slice()` (traditional method) and the spread operator (`[ ...params ]`).

**Options Compared**

There are two options being compared:

1. **Traditional Method**: Using `Array.prototype.slice()`
2. **Spread Operator**: Using the spread operator (`[ ...params ]`)

**Pros and Cons of Each Approach**

*   **Traditional Method (Array.prototype.slice())**
    *   Pros:
        *   Widely supported across different browsers and versions.
        *   Generally faster, as it only returns a reference to the original array's data, rather than creating a new copy.
    *   Cons:
        *   Can be less efficient when working with large arrays, as it creates an intermediate array that needs to be garbage collected.
*   **Spread Operator ([ ...params ] )**
    *   Pros:
        *   Creates a new copy of the original array, which is more suitable for larger datasets.
        *   Often faster and more memory-efficient than the traditional method for large arrays.
    *   Cons:
        *   Less widely supported across older browsers and versions.

**Library/Function Used**

The `Array.prototype.slice()` method is a built-in JavaScript function that returns a shallow copy of an array.

**Special JS Feature/Syntax**

There are no special features or syntax mentioned in the benchmark definition. The focus is on comparing two existing approaches to creating an array copy.

**Other Alternatives**

If you want to compare other methods for creating an array copy, here are some alternatives:

*   `Array.prototype.concat()`: Similar to the spread operator but may be less efficient.
*   `Array.from()`: Creates a new array from an iterable or an array-like object, which can be faster than slice() for large datasets.

**Benchmark Preparation Code**

The provided script preparation code creates an array `params` with various data types and values:
```javascript
var params = [ "hello", true, 7 , 3.03, "haha", false, null, undefined, 16 ];
```
This array is then used to create the benchmark test cases.

**Individual Test Cases**

There are two individual test cases:

1.  `const other = params.slice();`: Uses the traditional method (`Array.prototype.slice()`).
2.  `const other = [ ...params ];`: Uses the spread operator.

These test cases compare the performance of each approach in creating an array copy.

Related benchmarks:

arr.slice() vs spread operator (version: 2)

Compare the new ES6 spread operator with the traditional slice() method

Comparing performance of: Array.prototype.slice vs spread operator

Created: 5 years ago by: Registered User

Jump to the latest result

Array.prototype.slice

spread operator

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):