Benchmark: unshift, splice, concat, spread

Script Preparation code:

var arr = [1, 2, 3, 4];
var int = 0;

Tests:

unshift
arr.unshift(int);
concat
var newArr = [int].concat(arr);
spread
var newArr = [int, ...arr];
splice
var newArr = arr.splice(0, 0, int);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
unshift
concat
spread
splice

Fastest: N/A

Slowest: N/A

Latest 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 JavaScript operations is essential to understand how different methods affect execution speed and efficiency.

The provided benchmark uses `JSON` to define the test cases, which represent JavaScript operations on arrays: unshift, splice, concat, and spread.

Let's break down each option:

1. **unshift**: This operation adds a new element at the beginning of an array.
	* Pros:
		+ Efficient for inserting elements at the beginning of the array.
		+ Can be used when you need to insert data in a specific order or position.
	* Cons:
		+ May require more memory allocation and copying if the array is large.
2. **splice**: This operation removes or inserts elements in an array.
	* Pros:
		+ Flexible for inserting, deleting, or replacing elements anywhere in the array.
		+ Can be used when you need to modify an existing array without creating a new one.
	* Cons:
		+ May require more memory allocation and copying if the array is large.
		+ Can have performance implications if done frequently due to its overhead.
3. **concat**: This operation creates a new array by concatenating two or more arrays.
	* Pros:
		+ Easy to understand and use when working with small arrays or datasets.
		+ Can be used when you need to create a new array from existing data without modifying the original.
	* Cons:
		+ May require additional memory allocation for creating a new array.
		+ Less efficient than `unshift` or `splice` when dealing with large arrays.

The spread operator (`...`) is used in one of the test cases to create a new array by spreading an existing array's elements into a new array. This operation:

* Pros:
	+ Efficient for creating a new array from an existing one.
	+ Can be used when you need to create a copy of an array without modifying it.
* Cons:
	+ May require additional memory allocation for creating a new array.

The chosen method ultimately depends on the specific use case, performance requirements, and personal preference. In general:

* Use `unshift` when inserting data at the beginning of an array or maintaining a specific order.
* Use `splice` when modifying existing arrays frequently or when you need to remove or replace elements.
* Use `concat` when working with small datasets or creating new arrays from existing data without modification.

The test cases use JavaScript methods provided by the browser's built-in libraries, which is essential for benchmarking.

Related benchmarks:

unshift, splice, concat, spread (version: 0)

Comparing performance of: unshift vs concat vs spread vs splice

Created: 3 years ago by: Guest

Jump to the latest result

unshift

concat

spread

splice

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):