Benchmark: Check mytest - MeasureThat.net

Script Preparation code:

var newArr = ['1', '2', '3', '4'];

Tests:

Boolean
!!newArr.length && 1
standard
newArr.length > 0 && 1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Boolean
standard

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser/OS: Chrome 108 on Windows

View result in a separate tab

Test name	Executions per second
Boolean	19361398.0 Ops/sec
standard	10822763.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark in detail.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark called `Check mytest` created on MeasureThat.net. The benchmark compares two different approaches to check if an array is not empty.

**Script Preparation Code**

The script preparation code defines an array `newArr` with four string elements: "1", "2", "3", and "4". This array will be used as the input for the benchmarks.

```javascript
var newArr = ['1', '2', '3', '4'];
```

**Html Preparation Code**

There is no HTML preparation code, which means that only JavaScript code will be executed for this benchmark.

**Benchmark Definition**

The benchmark definition specifies two test cases:

1. **Boolean**: `!!newArr.length && 1`
	* This expression checks if the array `newArr` is not empty using the double negation operator (`!!`). If the array is not empty, the expression evaluates to `true`.
2. **standard**: `newArr.length > 0 && 1`

**Comparison**

The two benchmarks are compared to determine which approach is faster.

**Pros and Cons of each Approach**

1. **Boolean**: `!!newArr.length && 1`
	* Pros:
		+ Compact code
	* Cons:
		+ Uses double negation, which can be less readable for some developers
2. **standard**: `newArr.length > 0 && 1`
	* Pros:
		+ More readable and intuitive than the Boolean approach
	* Cons:
		+ Longer code

**Library**

There is no explicit library mentioned in the benchmark definition, but the use of the double negation operator (`!!`) is a JavaScript feature introduced in ECMAScript 2011 (ES6). The `length` property of an array is also a built-in JavaScript property.

**Special JS Feature or Syntax**

The benchmark uses the double negation operator (`!!`). This operator has two meanings:

* In a boolean context, it negates the value, i.e., `!!true === false && !!false === true`.
* In a numeric context, it converts the number to its integer equivalent.

In this case, the double negation is used to convert the `length` property of the array to a boolean value (`true` or `false`). The `&& 1` part is a common idiom in JavaScript that ensures the expression always evaluates to `true`, even if the `length` property is zero.

**Other Alternatives**

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

* Using `Object.keys(newArr).length > 0 && 1`: This approach uses the `Object.keys()` method to get an array of keys from the input object (in this case, the `newArr` array) and then checks if the length of that array is greater than zero.
* Using `Array.prototype.some.call(newArr, () => true) && 1`: This approach uses the `some()` method on the array to check if at least one element meets a certain condition (in this case, always `true`).

Related benchmarks:

Check mytest (version: 0)

Comparing performance of: Boolean vs standard

Created: 2 years ago by: Guest

Jump to the latest result

Boolean

standard

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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