Benchmark: Array.prototype.splice vs spread operator

Tests:

Array.prototype.slice
var original = [0,1,2,3,4,5,7,8,9,10,12]; original.splice(6,0,6).splice(11, 0, 11);
spread operator
var original = [0,1,2,3,4,5,7,8,9,10,12]; original = [...original.slice(0, 6), 6, ...original.slice(6, 11), 11, original[12]];

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Test case name	Result
Array.prototype.slice
spread operator

Fastest: N/A

Slowest: N/A

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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 considered.

**Benchmark Definition**

The benchmark is comparing two approaches to modify an array in JavaScript:

1. **`Array.prototype.splice`**: The traditional method of modifying an array by removing or inserting elements at specific indices.
2. **ES6 Spread Operator (`...`)**: A new syntax introduced in ES6 that allows creating a new array with some elements from the original array.

**Options Compared**

The benchmark is comparing two options:

1. `Array.prototype.splice` (traditional method)
2. Using the spread operator to create a new array and then concatenating it with the modified parts of the original array (`original[12]`).

**Pros and Cons**

Here are some pros and cons for each approach:

* **`Array.prototype.splice`**:
	+ Pros: Generally faster and more efficient, as it modifies the original array in place.
	+ Cons: Can be less intuitive to use, especially when dealing with complex arrays or edge cases.
* **ES6 Spread Operator (`...`)**:
	+ Pros: More concise and easier to read, as it creates a new array without modifying the original one.
	+ Cons: Can be slower than the traditional method, as it involves creating a new array and then concatenating elements.

**Library**

There is no explicit library mentioned in this benchmark. However, if we consider the `Array.prototype` methods, they are part of the ECMAScript standard, so there isn't a separate library involved.

**Special JS Feature or Syntax**

The ES6 spread operator (`...`) is a relatively new syntax introduced in ECMAScript 2015 (ES6). It's a shorthand way to create a new array by spreading elements from an existing array. This feature was adopted by modern JavaScript engines, including Chrome.

**Other Considerations**

When choosing between these two approaches, consider the following:

* Performance: If you need to modify arrays frequently, the traditional `Array.prototype.splice` method might be faster.
* Code readability and maintainability: The spread operator can make code more concise and easier to understand, especially when working with complex array operations.

**Alternative Approaches**

If neither of these approaches suits your needs, consider the following alternatives:

* Using other array methods like `Array.prototype.concat()` or `Array.prototype.push()`.
* Utilizing modern array features like `Array.from()`, `Array.prototype.reduce()`, or `Array.prototype.map()`.
* Leveraging libraries like Lodash (specifically, its `mapObject()` function) to perform complex array operations.

For this specific benchmark, the focus is on comparing the performance of two traditional JavaScript approaches to modifying arrays.

Related benchmarks:

Array.prototype.splice vs spread operator (version: 0)

Compare the new ES6 spread operator with the traditional splice() 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):