Benchmark: spread20211 - MeasureThat.net

Tests:

1
var params = [ "hello", true, 7, 1,2,3,4,5,6,7,8 ]; var other = [ 1, 2 ].concat(params);
2
var params = [ "hello", true, 7, 1,2,3,4,5,6,7,8 ]; var other = [ 1, 2, ...params ];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial to ensure efficient and fast execution of code. Let's break down the provided benchmark definition, test cases, and latest results.

**Benchmark Definition**
The benchmark definition represents a piece of code that defines a microbenchmark. In this case, there are two test cases:

1. `var params = [ "hello", true, 7, 1,2,3,4,5,6,7,8 ];\r\nvar other = [ 1, 2 ].concat(params);`
2. `var params = [ "hello", true, 7, 1,2,3,4,5,6,7,8 ];\r\nvar other = [ 1, 2, ...params ];`

**Options being compared**
The two test cases differ in how they spread the elements of the `params` array into the `other` array:

1. Test Case 1 uses `.concat()`, which concatenates the arrays and creates a new array.
2. Test Case 2 uses the spread operator (`...`) to directly spread the elements of `params` into the `other` array.

**Pros and Cons**

* `.concat()`:
	+ Pros: Easy to understand, widely supported, and works in older browsers that don't support the spread operator.
	+ Cons: Creates a new array, which can lead to performance issues for large datasets.
* Spread Operator (`...`):
	+ Pros: More efficient than `.concat()`, as it avoids creating a new array. It's also more concise and modern syntax.
	+ Cons: Less widely supported in older browsers (before Chrome 45). May not work in strict mode.

**Library/Library Purpose**
None of the test cases use any libraries.

**Special JavaScript Feature/Syntax**
The spread operator (`...`) is a new feature introduced in ECMAScript 2015. It allows for more concise and efficient way to create new arrays by spreading elements from an existing array or object.

**Other alternatives**
If you want to avoid using the spread operator, you can also use the `Array.prototype.push.apply()` method to achieve the same result:

```javascript
var params = [ "hello", true, 7, 1,2,3,4,5,6,7,8 ];
var other = [];
params.forEach((element) => {
    other.push(element);
});
```

This approach is less efficient than using the spread operator but still viable for older browsers that don't support it.

In summary, the benchmark compares two approaches to spreading elements into an array: `.concat()` and the spread operator (`...`). The latter is more efficient and modern syntax but has limited browser support. The alternative `push.apply()` method provides a compromise between efficiency and browser support.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser/OS: Chrome 92 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
1	7662406.5 Ops/sec
2	20895958.0 Ops/sec

Related benchmarks:

spread20211 (version: 0)

Comparing performance of: 1 vs 2

Created: 3 years ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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