Benchmark: Array.prototype.slice vs spread operator1

Tests:

Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var 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 benchmark and explain what's being tested, compared, and the pros and cons of each approach.

**Benchmark Definition**
The benchmark is defined in JSON format as:

```
{
  "Name": "Array.prototype.slice vs spread operator1",
  "Description": "Compare the new ES6 spread operator with the traditional slice() method"
}
```

This benchmark compares two approaches to create a shallow copy of an array: `Array.prototype.slice()` and the new ES6 spread operator (`...`).

**Script Preparation Code**
There is no script preparation code provided, which means that the benchmark script is assumed to be empty.

**Html Preparation Code**
There is also no html preparation code provided, which means that the benchmark HTML is also assumed to be empty.

**Individual Test Cases**
The benchmark consists of two test cases:

1. **Array.prototype.slice**

```javascript
var params = [ "hello", true, 7 ];
var other = params.slice();
```

This test case creates an array `params` and then uses the `slice()` method to create a shallow copy of it.

2. **Spread Operator (New ES6)**

```javascript
var params = [ "hello", true, 7 ]
var other = [ ...params ];
```

This test case creates an array `params` and then uses the spread operator (`...`) to create a shallow copy of it.

**Library: None**
Neither of these test cases relies on any external libraries.

**Special JS Feature or Syntax: New ES6 Spread Operator**
The new ES6 spread operator is a relatively recent feature in JavaScript, introduced in ECMAScript 2015 (ES6). It allows you to create a shallow copy of an array by using the `...` operator before the array expression. This syntax was not available until ES6.

**Pros and Cons**

*   **Array.prototype.slice():**
    *   Pros: Widely supported across all browsers, has been around for a long time (ES5), relatively fast.
    *   Cons: Can be slower than the new ES6 spread operator, especially for large arrays.
*   **New ES6 Spread Operator (`...`):**
    *   Pros: Faster than `Array.prototype.slice()`, more efficient, and modern syntax.
    *   Cons: Not supported in older browsers (pre-ES6), might be slower due to parsing complexity.

**Other Alternatives**

1.  **Array.from():**
    *   This method is used to create a new array from an iterable or array-like object.
    *   Pros: Fast, modern syntax, widely supported across all browsers.
    *   Cons: Not the most intuitive way to create an array copy.

2.  **Object.assign():**
    *   This method is used to copy values from one or more source arrays to a target array.
    *   Pros: Fast, widely supported, can be used for copying objects as well.
    *   Cons: Might not produce the exact same result as `Array.prototype.slice()` or new ES6 spread operator.

In summary, when working with JavaScript, it's essential to consider the differences between these methods and choose the one that best fits your needs based on factors like speed, browser support, and code readability.

Related benchmarks:

Array.prototype.slice vs spread operator1 (version: 0)

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: Guest

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):