Benchmark: const arr = [1,2,3]; const res = !!arr.lenght;

Tests:

const arr = [1,2,3]; const res = !!arr.lenght;
const arr = [1,2,3]; const res = !!arr.lenght;
const arr = [1,2,3]; const res = arr.lenght > 0;
const arr = [1,2,3]; const res = arr.lenght > 0;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
const arr = [1,2,3]; const res = !!arr.lenght;
const arr = [1,2,3]; const res = arr.lenght > 0;

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36 Edg/106.0.1370.37

Browser/OS: Chrome 106 on Windows

View result in a separate tab

Test name	Executions per second
const arr = [1,2,3]; const res = !!arr.lenght;	766908800.0 Ops/sec
const arr = [1,2,3]; const res = arr.lenght > 0;	761964672.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON data and explain what's being tested in each benchmark.

**Benchmark Definition**

The `Benchmark Definition` is a JavaScript expression that defines a small program to be executed multiple times. In this case, there are two benchmarks:

1. `const arr = [1,2,3]; const res = !!arr.lenght;`
   - This benchmark creates an array `arr` with three elements and then checks if the length of `arr` is truthy using the double-not operator (`!!`). The result will be either `true` or `false`.

2. `const arr = [1,2,3]; const res = arr.lenght > 0;`
   - This benchmark creates an array `arr` with three elements and then checks if the length of `arr` is greater than zero using a simple comparison.

**Options Compared**

In both benchmarks, the only difference is in how the length of the array is accessed:

1. The first benchmark uses the double-not operator (`!!`) to check the truthiness of the length.
2. The second benchmark uses a simple comparison (`arr.lenght > 0`).

**Pros and Cons**

### Double-Not Operator (`!!`)

Pros:

* Concise and expressive way to check if a value is truthy (i.e., not null, undefined, or zero).
* Can be useful for readability when checking the existence of an array.

Cons:

* May be slower than simple comparisons due to its syntax and potential parsing overhead.
* Can lead to unexpected behavior if the variable being checked has a special meaning in the context.

### Simple Comparison (`arr.length > 0`)

Pros:

* Fastest way to check if an array has at least one element.
* Directly checks for the presence of elements without involving any operators or potential parsing overhead.

Cons:

* Requires knowledge of the `length` property and its behavior with arrays.
* May not be as concise or readable in some cases.

**Other Considerations**

- Both approaches assume that the array has a defined length. If the array is empty, both expressions will evaluate to false.

### Library Usage

None of the provided benchmarks use any external libraries. However, if we were to consider the `length` property, it's worth noting that some JavaScript engines or browsers might have different behavior when accessing this property.

**Special JS Features or Syntax**

- Neither benchmark uses any special JavaScript features or syntax beyond standard JavaScript syntax for arrays and comparisons.

Related benchmarks:

const arr = [1,2,3]; const res = !!arr.lenght; (version: 0)

Comparing performance of: const arr = [1,2,3]; const res = !!arr.lenght; vs const arr = [1,2,3]; const res = arr.lenght > 0;

Created: 3 years ago by: Guest

Jump to the latest result

const arr = [1,2,3]; const res = !!arr.lenght;

const arr = [1,2,3]; const res = arr.lenght > 0;

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):