Benchmark: spread operator vs push test

Tests:

Spread Operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Push
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].push(params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread Operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Mobile Safari/537.36 EdgA/127.0.0.0

Browser/OS: Chrome Mobile 127 on Android

View result in a separate tab

Test name	Executions per second
Spread Operator	6699539.5 Ops/sec
Push	10631991.0 Ops/sec

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!

The test case measures the performance difference between two approaches: using the spread operator (`...`) and pushing elements onto an array (`push()`).

**Spread Operator Approach**

In modern JavaScript, the spread operator allows you to expand an iterable (such as an array or a string) into individual elements. In this benchmark, the spread operator is used to create a new array `other` by spreading the elements of `params`. The syntax is: `[ ...params ]`.

**Push Approach**

The push approach involves creating a new array and then pushing each element from `params` onto it. The syntax is: `[ 1, 2 ].push(params)`.

**Pros and Cons**

* **Spread Operator**: Pros:
	+ More concise and readable code
	+ Can be faster for large arrays (since it avoids the overhead of creating a new array and then pushing elements)
Cons:
	+ May not work as expected with certain types of values (e.g., objects, functions)
	+ Not supported in older browsers or environments
* **Push Approach**: Pros:
	+ More flexible and compatible with older browsers or environments
	+ Can be used with any type of value, not just arrays or iterables
Cons:
	+ Less concise and less readable code
	+ May be slower for large arrays (due to the overhead of creating a new array and pushing elements)

**Library Used**

There is no library explicitly mentioned in the benchmark definition. However, it's worth noting that JavaScript engines like V8 (used by Chrome) have optimized implementations for both spread operator and push approaches.

**Special JS Feature or Syntax**

The benchmark uses the ES6 spread operator (`...`), which was introduced in ECMAScript 2015. This feature allows you to expand an iterable into individual elements, making code more concise and readable.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

* Using `Array.prototype.slice()` instead of the spread operator or push approach.
* Implementing your own custom array creation and pushing logic.
* Using other library functions like `Lodash` or `Underscore` to perform similar operations.

Keep in mind that these alternatives might not provide significant performance improvements over the original benchmark, but they can be useful for specific use cases or requirements.

Related benchmarks:

spread operator vs push test (version: 0)

Compare the new ES6 spread operator with and push Comparing performance of spread operator vs Push

Comparing performance of: Spread Operator vs Push

Created: 6 years ago by: Guest

Jump to the latest result

Spread Operator

Push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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