Benchmark: reduce 20000 - MeasureThat.net

Script Preparation code:

var list = [];
var LIMIT = 20000;

Tests:

spread
for(var i = 0; i < LIMIT; i++) list = [...list, {a:2}];
concat
for(var i = 0; i < LIMIT; i++) list == list.concat([{a:2}]);
push
for(var i = 0; i < LIMIT; i++) list.push({a:2});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
concat
push

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explain what's being tested on this provided JSON.

**Benchmark Overview**

The benchmark is designed to measure the performance of three different ways to add elements to an array in JavaScript: using the spread operator (`...`), `concat()` method, and `push()` method. The benchmark is compared across various browsers and devices.

**Options Compared**

The three options being compared are:

1. **Spread Operator (**)**: This operator was introduced in ECMAScript 2015 (ES6) as a way to create a new array by spreading the elements of an existing array.
2. **concat() Method**: The `concat()` method is a built-in JavaScript method that returns a new array created by concatenating one or more arrays.
3. **push() Method**: The `push()` method is another built-in JavaScript method that adds one or more elements to the end of an array.

**Pros and Cons**

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

* **Spread Operator (**)**:
	+ Pros: Fast, efficient, and concise way to add elements to an array. It creates a new array without modifying the original one.
	+ Cons: Not supported in older browsers or JavaScript engines that don't support ES6.
* **concat() Method**:
	+ Pros: Widely supported across browsers and JavaScript engines, including older ones.
	+ Cons: Can be slower than the spread operator due to the creation of a new array object.
* **push() Method**:
	+ Pros: Fast and efficient way to add elements to an array. It modifies the original array in place.
	+ Cons: Can be slower than the spread operator for very large arrays, as it involves rehashing the array's internal data structure.

**Library**

There is no explicit library mentioned in the benchmark definition or test cases. However, some browsers (like Firefox) may use their own libraries or implementations of these methods under the hood.

**Special JS Feature or Syntax**

The benchmark does not require any special JavaScript features or syntax, making it accessible to a wide range of developers and browsers.

**Other Alternatives**

For measuring array operations performance, you might consider using other alternatives like:

* **Array.prototype.set()**: Introduced in ECMAScript 2022 (ES2022), this method allows setting values for specific indices in an array without creating a new array.
* **WebAssembly (WASM)**: A binary format that allows running compiled code in web browsers, potentially offering better performance and efficiency.

Keep in mind that these alternatives may not be widely supported or tested yet, so the spread operator and push() method remain popular choices for measuring array operations performance.

Related benchmarks:

reduce 20000 (version: 0)

Comparing performance of: spread vs concat vs push

Created: 6 years ago by: Guest

Jump to the latest result

spread

concat

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):