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toFixed vs toPrecision vs Math.round() vs Math.floorfaster test
(version: 0)
Comparing performance of:
Math.floor fast vs Math.floor faster
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var someFloat = 0.123456789;
Tests:
Math.floor fast
~~(someFloat * 10000) / 10000;
Math.floor faster
~~(someFloat * 1e4) / 1e4;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Math.floor fast
Math.floor faster
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain what's being tested in this benchmark and the pros and cons of each approach. **Benchmark Overview** The provided JSON defines a JavaScript microbenchmark that compares the performance of four different methods for rounding floating-point numbers: 1. `toFixed()` 2. `toPrecision()` 3. `Math.round()` 4. `Math.floor` **Library Used: None** There is no library used in this benchmark, so we can focus on the built-in JavaScript methods. **Special JS Features/Syntax: None** This benchmark does not use any special JavaScript features or syntax that would require additional explanation. **Test Cases and Approaches** The two test cases are: 1. `Math.floor fast`: This test case uses a single operation to round down a floating-point number using the bitwise NOT operator (`~~`) applied to the result of multiplying the input by 10000 and then dividing by 10000. The goal is to measure the performance of this method. 2. `Math.floor faster`: This test case modifies the previous approach by using the exponential notation (`1e4`) instead of a constant multiplier. **Comparison of Approaches** The four methods being compared are: * `toFixed()`: Rounds a number to a specified precision (in this case, 0 decimal places). * `toPrecision()`: Rounds a number to a specified precision (in this case, 0 decimal places). * `Math.round()`: Rounds a number to the nearest integer. * `Math.floor`: Rounds down a number to the nearest integer. Here are some pros and cons of each approach: * `toFixed()` and `toPrecision()`: These methods can be slow because they involve creating a new string representation of the number, which requires additional memory allocations. However, they can be useful if you need to format numbers for display purposes. * `Math.round()`: This method is generally faster than `toFixed()` and `toPrecision()` because it only involves a simple arithmetic operation. However, it may not always produce the desired rounding behavior (e.g., it rounds up if the fractional part is .5). * `Math.floor`: This method is usually the fastest of the four options because it uses a simple bitwise operation to round down the number. **Alternative Approaches** If you need more control over the rounding process or want to explore other methods, here are some alternative approaches: * Use `Number.EPSILON` to determine the smallest value that can be added to 1.0 before it's no longer equal to 1.0. This can help you find a good trade-off between precision and performance. * Consider using a third-party library like `mathjs` or `lodash.round` which offer more advanced rounding algorithms and options. **Benchmark Results** The latest benchmark results show that: * `Math.floor fast`: This test case produces the highest number of executions per second (10514946) on the specified Chrome 81 browser. * `Math.floor faster`: This test case produces a lower number of executions per second (10286492) on the same browser. These results suggest that using `Math.floor` can be a good option for simple rounding tasks, but may not always be the fastest approach. It's essential to consider your specific use case and performance requirements when choosing a rounding method.
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