Benchmark: array.length !==0 vs array.length > 0

Script Preparation code:

var arr = [];

Tests:

array length !==0
if (arr.length !== 0) { console.log(1); } else { console.log(0); }
array length > 0
if (arr.length > 0) { console.log(1); } else { console.log(0); }
array length
if (arr.length) { console.log(1); } else { console.log(0); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array length !==0
array length > 0
array length

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 23 days ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.4

View result in a separate tab

Test name	Executions per second
array length !==0	2892877.5 Ops/sec
array length > 0	2571616.8 Ops/sec
array length	2467001.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial for developers to optimize their code and create efficient applications.

Let's break down the provided benchmark definition:

**Benchmark Definition:**

The benchmark measures the difference between two conditions:
```javascript
if (arr.length !== 0) {
    console.log(1);
} else {
    console.log(0);
}
```

and

```javascript
if (arr.length > 0) {
    console.log(1);
} else {
    console.log(0);
}
```
Both conditions check if the length of an array `arr` is not equal to zero (`!==`) and greater than zero (`> 0`), respectively. The only difference between the two is that one uses strict inequality (`!==`) while the other uses a loose comparison with the exact value `0`.

**Options compared:**

Two options are being compared:

1. **`arr.length !== 0`**: This checks if the length of the array is not equal to zero using the strict inequality operator.
2. **`arr.length > 0`**: This checks if the length of the array is greater than zero using a loose comparison.

**Pros and Cons:**

*   **Strict Inequality (`!==`)**
    *   Pros:
        *   More accurate for arrays with negative values or NaN (Not a Number).
        *   Better suited for cases where you need to ensure the length is not equal to a specific value.
    *   Cons:
        *   Slower due to the additional comparison step.

*   **Loose Inequality (`> 0`)**

*   Pros:
        *   Faster than strict inequality, as it only checks if the length is positive without comparing against a specific value.
        *   Suitable for most cases where you just want to check if an array has at least one element.
    *   Cons:
        *   Less accurate when dealing with arrays containing negative values or NaN.
        *   May not work correctly in all edge cases, such as checking if an empty string's length is greater than zero.

**Library usage:**

The provided benchmark does not explicitly use any JavaScript libraries. However, it assumes the presence of a global `console` object for logging purposes.

**Special JS features or syntax:**

There are no special JavaScript features or syntax used in these benchmark definitions. The code uses basic arithmetic and logical operators (`===`, `!==`, `>`), as well as an array length property to access the size of the input array.

**Alternatives:**

For measuring JavaScript performance, some popular alternatives include:

1.  **V8 Benchmark Suite**: A collection of benchmark tests written by Google that covers various JavaScript topics.
2.  **jsPerf**: An online tool for comparing the performance of different JavaScript implementations (e.g., V8 vs. SpiderMonkey).
3.  **Benchmark.js**: A simple library for creating and running JavaScript benchmarks.

These alternatives offer a wide range of pre-built benchmark tests and allow users to create their own custom benchmarks with various options and configurations.

When it comes to measuring the performance difference between two conditions, you can create your own benchmark or use an existing one like the provided `array.length !==0 vs array.length > 0` test case.

Related benchmarks:

array.length !==0 vs array.length > 0 (version: 0)

Comparing performance of: array length !==0 vs array length > 0 vs array length

Created: one year ago by: Guest

Jump to the latest result

array length !==0

array length > 0

array length

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):