Benchmark: Check if array has elements

Tests:

length
const list = [1, 2, 3] if (list.length) return
length > 0
const list = [1, 2, 3] if (list.length > 0) return
list
const list = [1, 2, 3] if (list) return

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
length
length > 0
list

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Overview of MeasureThat.net**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The platform provides a simple way for developers to measure the performance of their code snippets, helping them identify optimization opportunities and compare different approaches.

**Benchmark Definition JSON Explanation**

The provided Benchmark Definition JSON contains basic information about the benchmark:

* `Name`: A human-readable name for the benchmark.
* `Description`: An optional description of the benchmark. In this case, it's empty.
* `Script Preparation Code` and `Html Preparation Code`: These fields are empty, indicating that no additional setup code is required.

**Individual Test Cases**

The test cases are defined in the JSON array:

1. **"length"`**
	* Benchmark Definition: `const list = [1, 2, 3]\r\nif (list.length) return`
	* Purpose: Measure the performance of a simple if statement that checks the length of an array.
	* Pros:
		+ Easy to understand and implement.
		+ Provides a baseline for other test cases.
	* Cons:
		+ May not be representative of real-world scenarios, as it only checks the length of an array.
2. **"length > 0"`**
	* Benchmark Definition: `const list = [1, 2, 3]\r\nif (list.length > 0) return`
	* Purpose: Measure the performance of a conditional statement that checks if the length of an array is greater than 0.
	* Pros:
		+ Similar to the first test case, but with an additional condition.
	* Cons:
		+ May not be representative of real-world scenarios, as it only checks a specific subset of cases.
3. **"list"`**
	* Benchmark Definition: `const list = [1, 2, 3]\r\nif (list) return`
	* Purpose: Measure the performance of a simple if statement that checks the value of an array reference.
	* Pros:
		+ Tests the behavior of the nullish coalescing operator (`??`), which is a relatively new feature in JavaScript.
	* Cons:
		+ May not be representative of real-world scenarios, as it only tests a specific edge case.

**Library: `??` (Nullish Coalescing Operator)**

The `??` operator is a binary operator that returns the first operand if it's not null or undefined, and the second operand otherwise. It was introduced in ECMAScript 2020.

In this benchmark, the test case `"list"` uses the `??` operator to check if an array reference is truthy. The purpose of this test is to measure the performance of this new feature.

**Other Considerations**

When creating benchmarks on MeasureThat.net:

* Use simple, representative code snippets that cover the desired scenarios.
* Avoid using complex logic or multiple conditions, as they may skew the results.
* Keep the benchmark code concise and easy to understand.
* Test with different browsers, devices, and operating systems to ensure cross-platform compatibility.

**Alternatives**

If you want to create your own JavaScript benchmarks or microbenchmarks, consider using tools like:

1. Benchmark.js: A popular benchmarking library for Node.js and web applications.
2. Jest: A testing framework that includes built-in support for benchmarking.
3. WebPageTest: A tool for measuring the performance of web pages across different browsers and devices.

Keep in mind that creating high-quality benchmarks requires careful consideration of factors like input data, algorithm complexity, and hardware variations. MeasureThat.net provides a convenient starting point for testing your JavaScript code snippets.

Related benchmarks:

Check if array has elements (version: 0)

Comparing performance of: length vs length > 0 vs list

Created: 3 years ago by: Guest

Jump to the latest result

length

length > 0

list

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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