Benchmark: Number vs + vs parseFloat + properties px

Tests:

Number
var number = Number('20px');
Unary +
var unary = +'20px';
parseFloat
var parse = parseFloat('20px');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number
Unary +
parseFloat

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 benchmark and its test cases.

**Benchmark Overview**

The benchmark compares three ways of handling measurements with units in JavaScript: using the built-in `Number` function, unary plus (`+`) operator, and `parseFloat`. The goal is to determine which method is faster.

**Test Cases**

There are three test cases:

1. **Number**: The first test case uses the `Number` function to parse a string containing a measurement with units ("20px"). This function attempts to convert the string to a number, ignoring any unit suffix.
2. **Unary +**: The second test case uses the unary plus (`+`) operator to parse a string containing a measurement with units ("20px"). This method explicitly treats the leading `+` as part of the measurement value.
3. **parseFloat**: The third test case uses `parseFloat` to parse a string containing a measurement with units ("20px"). This function is similar to `Number`, but it returns a floating-point number, allowing for decimal values.

**Comparison**

The benchmark compares the execution time of each test case on different browsers (Chrome 112) running on various platforms and operating systems. The results indicate that:

* Unary plus (`+`) tends to be faster than both `Number` and `parseFloat`.
* `Number` is slower than unary plus, but potentially faster than `parseFloat` for certain use cases.
* `parseFloat` can be slower due to its additional complexity and floating-point conversion.

**Pros and Cons of Each Approach**

1. **Number**: Pros:
	* Easy to use and understand.
	* Fast performance (once the function is inlined).
Cons:
	* Ignores unit suffixes, potentially leading to errors.
2. **Unary +**: Pros:
	* Faster execution time compared to `Number` and `parseFloat`.
	* Explicitly treats the leading `+` as part of the measurement value.
Cons:
	* May require extra code to handle invalid input (e.g., empty strings).
3. **parseFloat**: Pros:
	* Returns a floating-point number, allowing for decimal values.
Cons:
	* Slower execution time compared to unary plus and `Number`.

**Other Considerations**

* In modern JavaScript environments, `Number` is often inlined by the optimizer, making it faster than the other two options.
* The use of unit suffixes can lead to errors if not handled properly. For example, a measurement with units "20px" might be interpreted as 20 pixels instead of 20 points.
* The choice between unary plus and `parseFloat` depends on the specific requirements of your project.

**Alternatives**

Other ways to handle measurements with units in JavaScript include:

* Using regular expressions to extract unit suffixes from strings.
* Creating a custom function that handles measurement parsing and conversion.
* Utilizing third-party libraries or frameworks that provide measurement handling functionality.

Related benchmarks:

Number vs + vs parseFloat + properties px (version: 0)

Comparing performance of: Number vs Unary + vs parseFloat

Created: 3 years ago by: Guest

Jump to the latest result

Number

Unary +

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):