Benchmark: X.Y compare v2 - MeasureThat.net

Script Preparation code:

var strA = "1912.62";
var strB = "1912.63";

Tests:

noParse
var res = strB / strA - 1;
parseFloat
var res = strA * 1 / strB * 1 - 1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
noParse
parseFloat

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 JavaScript microbenchmark on MeasureThat.net.

**Benchmark Definition JSON**
The benchmark is defined in two parts:

1. **Script Preparation Code**: This section contains code that sets up variables `strA` and `strB` with specific values: `"1912.62"` and `"1912.63"`, respectively.
2. The actual **Benchmark Definition** is a single JavaScript statement that performs the calculation of interest:
	* For the first test case (`noParse`), it subtracts 1 from the result of dividing `strB` by `strA`.
	* For the second test case (`parseFloat`), it calculates the product of `strA` and 1, divided by the product of `strB` and 1, minus 1.

**Options Compared**
Two approaches are compared:

1. **Division without explicit conversion**: In both cases, the division is performed directly on strings (`strB / strA`). This approach assumes that the division will produce a decimal result.
2. **Using `parseFloat()` to convert one of the operands**: For the second test case, `parseFloat(strA)` and `parseFloat(strB)` are used instead of direct string division.

**Pros and Cons**

1. **Division without explicit conversion**:
	* Pros: Simple and straightforward approach.
	* Cons: May produce incorrect results if the division doesn't result in a decimal value (e.g., integer division).
2. **Using `parseFloat()` to convert one of the operands**:
	* Pros: Ensures that at least one operand is converted to a float, which helps avoid issues with integer division.
	* Cons: Introduces additional overhead due to function call and potential performance impact.

**Other Considerations**

* The use of floating-point arithmetic and string manipulation may be sensitive to the specific JavaScript engine and browser being used.
* It's worth noting that in modern JavaScript engines, division on strings is often implemented using a more complex algorithm that converts both operands to numbers behind the scenes. This approach can produce different results than the simple string division.

**Library Usage**
There are no external libraries mentioned in this benchmark.

**Special JS Features or Syntax**
None of the test cases use any special JavaScript features or syntax beyond standard arithmetic and string manipulation operations.

Now, let's look at some alternative approaches that could be used to benchmark similar calculations:

* **Integer division**: Instead of using floating-point arithmetic, you could perform integer division (`Math.floor(strB / strA) - 1`) and compare it with the original calculation.
* **Using a library like ` numeral.js` or `decimal.js`**: These libraries provide more precise control over decimal arithmetic, which could help mitigate issues related to floating-point precision.

Keep in mind that these alternative approaches may not directly translate to the specific use case of measuring performance differences between different JavaScript engines and browsers.

Related benchmarks:

X.Y compare v2 (version: 0)

Comparing performance of: noParse vs parseFloat

Created: 2 years ago by: Guest

Jump to the latest result

noParse

parseFloat

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):