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parseFloat(toFixed) vs Math.round()
(version: 0)
Comparing performance of:
toFixed vs Math.round
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var someFloat = '0.123456789';
Tests:
toFixed
parseFloat(parseFloat(someFloat).toFixed(2));
Math.round
Math.round(someFloat * 100) / 100;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
toFixed
Math.round
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
4 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Browser/OS:
Chrome 143 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=622544" width="100%" height="500px"></iframe>
Test name
Executions per second
toFixed
15533688.0 Ops/sec
Math.round
225236192.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help explain the benchmark being tested on MeasureThat.net. **Benchmark Overview** The benchmark tests two different approaches for converting a floating-point number to an integer: using `parseFloat` followed by `toFixed`, and using `Math.round`. The input value is set to `'0.123456789'`. **Options Compared** Two options are compared: 1. **`parseFloat(parseFloat(someFloat).toFixed(2);`**: This approach uses the `parseFloat` function twice, first to convert the string to a floating-point number, and then again to extract two decimal places using `toFixed`. The resulting integer value is then returned. 2. **`Math.round(someFloat * 100) / 100;`**: This approach multiplies the input float by 100, rounds the result using `Math.round`, and then divides by 100 to get the original integer value. **Pros and Cons** **`parseFloat(parseFloat(someFloat).toFixed(2);`** Pros: * More precise control over the number of decimal places * May be more suitable for certain use cases where a specific precision is required Cons: * Requires two function calls, which may lead to increased overhead * The first `parseFloat` call may not be necessary if the input string already represents a float **`Math.round(someFloat * 100) / 100;`** Pros: * Single function call with minimal overhead * Avoids unnecessary conversions Cons: * May lose precision due to the multiplication and division by 100 * Does not provide direct control over decimal places **Library: None** Neither option uses any external libraries. Both are built-in JavaScript functions. **Special JS Feature or Syntax: None** There is no special JavaScript feature or syntax being tested in this benchmark. **Other Alternatives** If you were to implement these tests yourself, some alternative approaches might include: * Using `Number` instead of `parseFloat` (since `Number` can parse strings that represent floats) * Implementing a custom rounding algorithm * Testing other rounding modes, such as half-even or banker's rounding However, for most use cases, the built-in JavaScript functions used in this benchmark will provide adequate results.
Related benchmarks:
toFixed vs Math.round() - result as a number
toFixed vs Math.round()
toFixed vs toPrecision vs Math.round() to 1 decimal place
toFixed vs toPrecision vs Math.round() asd
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