Benchmark: Variables declaration

Script Preparation code:

function calc(x, y, z) {
	return Math.sqrt(x**2 + y**2 + z**2);
}

Tests:

Normal
for (var i = 0; i < 100; i++) { var a = 1; var b = 2; var c = 2.1; calc(a, b, c); }
Normal 2
for (var i = 0; i < 100; i++) { var a = 1, b = 2, c = 2.1; calc(a, b, c); }
Associative array
for (var i = 0; i < 100; i++) { var t = { a: 1, b: 2, c: 2.1 } calc(t.a, t.b, t.c); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Normal
Normal 2
Associative array

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.

Let's break down the provided JSON data and explain what is being tested.

**Benchmark Definition**

The benchmark definition is a simple JavaScript function `calc` that calculates the square root of the sum of squares of three variables using the Math library. The function takes three arguments: `x`, `y`, and `z`.

**Script Preparation Code**

The script preparation code provides a concrete implementation of the `calc` function:
```javascript
function calc(x, y, z) {
  return Math.sqrt(x**2 + y**2 + z**2);
}
```
This code defines the `calc` function with the specified signature.

**Html Preparation Code**

There is no HTML preparation code provided in this benchmark definition. This means that the benchmark does not rely on any HTML-specific features or libraries.

**Individual Test Cases**

The benchmark consists of three test cases, each representing a different variable declaration approach:

1. **Normal**: `for (var i = 0; i < 100; i++) { var a = 1; var b = 2; var c = 2.1; calc(a, b, c); }`
This test case declares the variables `a`, `b`, and `c` using the traditional `var` keyword.
2. **Normal 2**: `for (var i = 0; i < 100; i++) { var a = 1, b = 2, c = 2.1; calc(a, b, c); }`
This test case uses the shorthand syntax to declare multiple variables on the same line.
3. **Associative array**: `for (var i = 0; i < 100; i++) { var t = { a: 1, b: 2, c: 2.1 }; calc(t.a, t.b, t.c); }`
This test case uses an associative array (object literal) to declare the variables `a`, `b`, and `c`.

**Library**

The Math library is used in the `calc` function to calculate the square root.

**Special JS Features/Syntax**

None of the provided code uses any special JavaScript features or syntax, such as ES6 classes, modules, or async/await.

**Pros and Cons**

Here are some pros and cons of each variable declaration approach:

1. **Normal**:
	* Pros: Easy to read and understand.
	* Cons: Less concise than other approaches.
2. **Normal 2**:
	* Pros: More concise than the traditional `var` syntax.
	* Cons: May be harder to read for those unfamiliar with shorthand syntax.
3. **Associative array**:
	* Pros: Concise and expressive, but may require more mental effort to understand.
	* Cons: Less common usage in JavaScript code.

**Other Alternatives**

If the benchmark were to test other variable declaration approaches, some alternatives could be:

1. Let statements
2. Const declarations (for variables that don't change)
3. Template literals for string interpolation
4. Array destructuring

However, these alternatives would likely require additional modifications to the `calc` function and might not provide a fair comparison with the original variable declaration approaches.

**Benchmark Considerations**

When creating benchmarks like this one, it's essential to consider the following factors:

1. **Repeatability**: The benchmark should be able to produce consistent results across multiple runs.
2. **Fairness**: The benchmark should compare similar code snippets or test cases that have a reasonable chance of being used in real-world scenarios.
3. **Sensitivity analysis**: The benchmark should consider the impact of different variables on performance, such as variable declarations, loop iterations, and function call overhead.

By taking these considerations into account, the MeasureThat.net team has created a comprehensive benchmarking framework for JavaScript microbenchmarks like this one.

Related benchmarks:

Variables declaration (version: 1)

Comparing performance of: Normal vs Normal 2 vs Associative array

Created: 8 years ago by: Registered User

Jump to the latest result

Normal

Normal 2

Associative array

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):