Benchmark: Type convert - MeasureThat.net

Script Preparation code:

var x = "42";

Tests:

1
var y = x / 2;
2
var y = parseInt( x, 0 ) / 2;
3
var y = Number( x ) / 2;
4
var y = +x / 2;
5
var y = (x | 0) / 2;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
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Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring the performance of different ways to convert a string to an integer in JavaScript is a great benchmark.

**Benchmark Definition:**

The benchmark definition specifies how the test will be prepared and executed. In this case, the script preparation code is "var x = '42';", which sets up a single variable `x` with the value `'42'`. There is no HTML preparation code, so we assume that the test only runs in a headless browser environment.

**Test Cases:**

The benchmark consists of five test cases, each defining how to convert the string `x` to an integer. The options compared are:

1. **Simple Division**: `var y = x / 2;`
	* Pros: Simple and easy to understand.
	* Cons: Can lead to precision issues due to floating-point arithmetic.
2. **parseInt()**: `var y = parseInt(x, 0) / 2;`
	* Pros: Uses a built-in function to perform integer conversion, which is more accurate than simple division.
	* Cons: May be slower due to the extra function call.
3. **Number()**: `var y = Number(x) / 2;`
	* Pros: Similar to parseInt(), uses a built-in function for integer conversion.
	* Cons: May be slower due to the extra function call, and may not work with certain edge cases (e.g., NaN).
4. ** unary Plus Operator**: `var y = +x / 2;`
	* Pros: More concise and readable than simple division or parseInt().
	* Cons: Similar to simple division, can lead to precision issues.
5. **Bitwise OR Operator**: `var y = (x | 0) / 2;`
	* Pros: Unique approach that leverages bitwise operations.
	* Cons: May be less readable and understood by developers familiar with JavaScript.

**Library Considerations:**

None of the test cases rely on any external libraries or modules. They all use built-in JavaScript functions to perform integer conversions.

**Special JS Features/Syntax:**

The `parseInt()` and `Number()` functions are using a special feature of JavaScript called " coercion" or "type conversion". This allows developers to convert values from one type to another without explicitly casting them.

**Other Alternatives:**

If you're interested in exploring alternative approaches, here are a few examples:

* Using the `toString()` method to perform integer conversions.
* Leveraging native browser functions like `BigInt` or `DecimalNumber`.
* Implementing custom integer conversion algorithms using bitwise operations.

These alternatives might offer performance advantages or improved readability, but may also introduce complexity and dependencies on specific browsers or environments.

Related benchmarks:

Type convert (version: 0)

Comparing performance of: 1 vs 2 vs 3 vs 4 vs 5

Created: 3 years ago by: Guest

Jump to the latest result

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5

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):