Benchmark: switch vs if in the case of a simple dml 2

Script Preparation code:

var actions = ['i', 'd', 'r', 'm', 'f', 'x', 'c', 'p'];

var generateRandomCommand = () => {
  const action = actions[Math.floor(Math.random() * actions.length)];
  const start = Math.floor(Math.random() * 10);
  const end = start + Math.floor(Math.random() * 10);
  const text = Math.random().toString(36).substring(7);
  return `${action} ${start} ${end} ${text}`;
};

Tests:

switch
const version1 = cmd => { const action = cmd[0]; const result = { action }; switch (action) { case 'i': result.start = parseInt(cmd[2]); result.text = cmd.slice(4); break; case 'd': result.start = parseInt(cmd[2]); result.end = parseInt(cmd[4]); break; case 'r': result.start = parseInt(cmd[2]); result.end = parseInt(cmd[4]); result.text = cmd.slice(6); break; case 'm': result.start = parseInt(cmd[2]); result.end = parseInt(cmd[4]); result.newPos = parseInt(cmd[6]); break; case 'f': result.search = cmd.slice(2); break; case 'x': case 'c': case 'p': result.start = parseInt(cmd[2]); result.end = parseInt(cmd[4]); break; default: console.log('oops') } return result; }; const command = generateRandomCommand(); version1(command);
if
const version2 = cmd => { const action = cmd[0] const result = { action } if (action !== 'f') { result.start = parseInt(cmd[2]) } if (action !== 'i' && action !== 'f') { result.end = parseInt(cmd[4]) } if (action === 'i') { result.text = cmd.slice(4) } else if (action === 'r') { result.text = cmd.slice(6) } if (action === 'm') { result.newPos = parseInt(cmd[6]) } if (action === 'f') { result.search = cmd.slice(2) } return result } const command = generateRandomCommand(); version2(command);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
switch
if

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition:**

The benchmark definition is a JavaScript function that takes a command string as input and processes it according to specific rules. The goal is to compare two approaches: `switch` and `if`.

**Script Preparation Code:**

This code generates a random command string with the following structure:
```
action start end text
```
Where:

* `action` is one of the eight actions: `i`, `d`, `r`, `m`, `f`, `x`, `c`, or `p`.
* `start` and `end` are numbers between 0 and 10.
* `text` is a random string.

**Html Preparation Code:**

There is no HTML preparation code provided, which means the benchmark focuses solely on JavaScript execution performance.

**Individual Test Cases:**

We have two test cases:

1. **switch**: This implementation uses a `switch` statement to check the `action` value and assign values to the corresponding properties of the output object.
2. **if**: This implementation uses multiple `if` statements to check the `action` value and assign values to the corresponding properties of the output object.

**Comparison:**

The benchmark compares the execution performance of these two approaches on a random command string.

**Pros and Cons:**

1. **switch**:
	* Pros:
		+ Can be more concise for simple cases.
		+ Can take advantage of compiler optimizations (e.g., constant folding).
	* Cons:
		+ May lead to slower performance due to the overhead of branching and table lookups.
		+ Can result in less predictable behavior if not properly tested.
2. **if**:
	* Pros:
		+ Can be more flexible for complex cases.
		+ Can avoid branch prediction errors by using multiple checks.
	* Cons:
		+ Can lead to slower performance due to the overhead of branching and conditional logic.
		+ May require more lines of code, making it less concise.

**Library:**

None of the provided JavaScript code uses a specific library. However, Chrome's `cmd` object is likely an implementation detail or a custom extension, which might not be relevant for this benchmark.

**Special JS Feature/Syntax:**

There are no special features or syntaxes used in either implementation that would require additional explanation.

**Other Alternatives:**

For similar benchmarks, you could consider the following alternatives:

1. **Using `switch` with early returns**: Instead of using a single `switch` statement, you could use multiple early-return statements to check for specific values.
2. **Using a dictionary or object**: You could define an object that maps actions to corresponding results and use the `action` value as a key to retrieve the result.
3. **Using a parser generator library**: If the command string has a more complex structure, you might consider using a parser generator library like ANTLR or Esprima to parse the input and generate code for each action.

Keep in mind that these alternatives may not be directly comparable to the `switch` and `if` implementations, as they would likely have different performance characteristics.

Related benchmarks:

switch vs if in the case of a simple dml 2 (version: 0)

Comparing performance of: switch vs if

Created: 2 years ago by: Guest

Jump to the latest result

switch

if

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):