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toFixed vs toPrecision vs Round v5
(version: 2)
Comparing performance of:
toFixed and Parsed vs toPrecision and parsed vs Round
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var someFloat = 0.123456789; var precision = 4;
Tests:
toFixed and Parsed
parseFloat(someFloat.toFixed(4));
toPrecision and parsed
parseFloat(someFloat.toPrecision(4));
Round
Math.round(someFloat*(10**precision))/(10**precision);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
toFixed and Parsed
toPrecision and parsed
Round
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in this benchmark. **What is being tested?** The provided JSON represents a JavaScript microbenchmark that compares the performance of three different approaches to round or format a floating-point number: 1. `toFixed()` 2. `toPrecision()` 3. `Math.round()` These functions are used to convert a decimal number to a string representation with a specified number of digits. **Options being compared:** The benchmark compares the execution time of each function on the same input value, which is a floating-point number `someFloat` with 4 decimal places. **Pros and Cons of each approach:** 1. **toFixed()** * Pros: Simple to use, widely supported, and works well for most cases. * Cons: Can lead to precision issues if not used carefully (e.g., `123.456.toFixed(2)` might be displayed as "123.46"). 2. **toPrecision()** * Pros: Similar to `toFixed()` but with more control over the precision. * Cons: Not as widely supported as `toFixed()`, and its behavior can be non-intuitive (e.g., `someFloat.toPrecision(0)` returns an empty string). 3. **Math.round()** * Pros: Fast, reliable, and works well for integers. * Cons: Can lead to precision issues with decimal numbers, especially if the input value is not an integer. **Library usage:** None of the benchmark functions rely on external libraries. **Special JS features or syntax:** The benchmark uses JavaScript's built-in `parseFloat()` function to parse the result of each formatting function. This ensures that the parsing and formatting are done in a single step, allowing for a fair comparison of the three approaches. **Other alternatives:** If you're looking for alternative approaches to rounding or formatting floating-point numbers, consider: 1. **BigInt**: For very large integers, `BigInt` provides a more accurate representation than regular JavaScript numbers. 2. **Decimal libraries**: Such as `decimal.js` or `mathjs`, which provide precise arithmetic operations with built-in support for decimal fractions. These alternatives might be overkill for simple rounding or formatting tasks but are useful when working with very large integers or requiring high precision.
Related benchmarks:
toFixed vs toPrecision vs Math.round() to 1 decimal place
toFixed vs toPrecision vs Math.round() asd
toFixed vs toPrecision vs Math.round() 2 decimal
toFixed vs toPrecision vs Math.round() 22222
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