Benchmark: set array index: slice vs Object.assign vs slice concacct vs slice and set

Tests:

splice
var index = 2; var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = [ ...array.slice(0, index), 10, ...array.slice(index + 1) ];
Object.assign
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = Object.assign([], array, {2: 10});
concat
var index = 2; var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = array.slice(0, index).concat(10, array.slice(index + 1))
slice and set
var index = 2; var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; const temp = array.slice(0) temp[index] = 10 var output = temp

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice
Object.assign
concat
slice and set

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 its test cases.

**Benchmark Definition**

The benchmark is defined by the `Name` field, which is "set array index: slice vs Object.assign vs slice concacct vs slice and set". This suggests that the benchmark is comparing different methods for setting an element at a specific index in an array.

**Test Cases**

There are four test cases:

1. **splice**: This test case uses the `slice` method followed by the `concat` method to create a new array with the desired element inserted.
2. **Object.assign**: This test case uses the `Object.assign` method to merge two arrays, creating a new array with the desired element inserted.
3. **concat**: This test case uses the `concat` method to concatenate two arrays and insert the desired element in between.
4. **slice and set**: This test case uses the `slice` method to create a copy of the original array, then modifies the copied array by setting the desired element.

**Library Usage**

The benchmark uses several libraries and techniques:

* **Array.prototype.slice()**: A built-in JavaScript method for creating a shallow copy of an array.
* **Object.assign()**: A built-in JavaScript method for merging two or more objects into one.
* **Array.prototype.concat()**: A built-in JavaScript method for concatenating two arrays.

**Special JavaScript Features/Syntax**

There are no special JavaScript features or syntax used in these test cases. They only utilize the standard methods and libraries mentioned above.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **splice**: Pros:
	* Simple to implement
	* Fast execution time (due to using built-in method)
Cons:
	* Can be slow for large arrays (as it involves shifting elements)
2. **Object.assign**: Pros:
	* Fast execution time (due to using built-in method)
	* Suitable for merging multiple arrays
Cons:
	* Requires passing in the array and the value to set, which can be error-prone
3. **concat**: Pros:
	* Easy to implement
	* Fast execution time (due to using built-in method)
Cons:
	* Requires creating a new array, which can be memory-intensive
4. **slice and set**: Pros:
	* Memory-efficient (as it only creates a copy of the original array)
Cons:
	* Can be slower than other approaches (due to using manual indexing)

**Other Alternatives**

Some alternative methods that could have been used in this benchmark include:

1. Using `Array.prototype.splice()` instead of `slice` and concatenation.
2. Using a custom implementation, such as using a for loop or a more efficient algorithm like binary search.

However, these alternatives may not be as well-suited for this specific use case, and the built-in methods used in the benchmark are likely to provide optimal performance.

Related benchmarks:

set array index: slice vs Object.assign vs slice concacct vs slice and set (version: 0)

Comparing performance of: splice vs Object.assign vs concat vs slice and set

Created: 3 years ago by: Guest

Jump to the latest result

splice

Object.assign

concat

slice and set

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):