Benchmark: Large arrays spread vs push

Tests:

spread
const params = new Array(10000); const other = [...params, 123];
push
const params = new Array(10000); const other = params.push(123);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
push

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 what is tested in the provided JSON benchmark:

**Benchmark Definition**

The benchmark definition is a script that creates an array of 10,000 elements and then performs two different operations on it: using the spread operator (`...`) to concatenate the array with a single element, or using the `push()` method to add a single element to the end of the array.

**Options Compared**

In this benchmark, two options are compared:

1. **Spread Operator (`...`)**: This option uses the spread operator to create a new array by concatenating the original array with a single element.
2. **Push Method (`push()`)**: This option uses the `push()` method to add a single element to the end of the original array.

**Pros and Cons**

* **Spread Operator (`...`)**:
	+ Pros:
		- Creates a new array, which can be more efficient for large arrays since it avoids modifying the original array.
		- Can be faster than `push()` since it's a simple array operation.
	+ Cons:
		- Creates a new array, which can consume more memory.
* **Push Method (`push()`)**:
	+ Pros:
		- Modifies the original array, which can be more efficient in terms of memory consumption.
	+ Cons:
		- Can be slower than the spread operator since it modifies the original array and needs to traverse its elements.

**Library and Special JS Features**

* **None**: There are no libraries used in this benchmark, nor any special JavaScript features like `let` or `const` declarations that would require a deeper understanding of the language.
* **ES6 Spread Operator (`...`)**: The spread operator was introduced in ECMAScript 2015 (ES6) and is a part of the modern JavaScript standard.

**Other Considerations**

When evaluating this benchmark, you should consider factors such as:

* Cache performance: If the array elements are frequently accessed or modified, the `push()` method might be faster since it's more likely to keep elements in cache.
* Memory allocation: Creating a new array using the spread operator can consume more memory than modifying the original array with `push()`.
* Browser optimizations: Different browsers may optimize these operations differently, affecting the benchmark results.

**Alternatives**

Other alternatives for creating arrays and concatenating or adding elements include:

* Using `Array.prototype.concat()` instead of the spread operator.
* Using `Array.prototype.push.apply()` to add multiple elements to the end of an array.
* Using a different data structure, such as a linked list or a binary search tree.

Keep in mind that these alternatives might have their own performance characteristics and trade-offs.

Related benchmarks:

Large arrays spread vs push (version: 0)

Comparing performance of: spread vs push

Created: 4 years ago by: Guest

Jump to the latest result

spread

push

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):