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(version: 0)
Comparing performance of:
+someFloat.toFixed(4); vs (Math.round(someFloat*10000)/10000); vs ~~(someFloat * 10000) / 10000;
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var someFloat = 0.123456789;
Tests:
+someFloat.toFixed(4);
+someFloat.toFixed(4);
(Math.round(someFloat*10000)/10000);
(Math.round(someFloat*10000)/10000);
~~(someFloat * 10000) / 10000;
~~(someFloat * 10000) / 10000;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
+someFloat.toFixed(4);
(Math.round(someFloat*10000)/10000);
~~(someFloat * 10000) / 10000;
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 the benchmark and its test cases. **What is being tested?** The benchmark measures the performance of different JavaScript operations on floating-point numbers. The specific tests are: 1. `+someFloat.toFixed(4);` - This operation rounds a float to 4 decimal places using the `toFixed()` method. 2. `(Math.round(someFloat*10000)/10000);` - This operation rounds a float to an integer by first multiplying it by 10,000, rounding to the nearest integer using `Math.round()`, and then dividing by 10,000. 3. `~~(someFloat * 10000) / 10000;` - This operation also rounds a float to an integer, but uses the bitwise NOT operator (`~~`) instead of `Math.round()`. **Options compared** The benchmark compares three different approaches: 1. **`toFixed(4)`**: Rounds a float to 4 decimal places using the `toFixed()` method. * Pros: Simple and straightforward way to round floats. * Cons: May be slower due to the overhead of calling a method, and may not be as efficient for very large numbers. 2. **`Math.round()`**: Rounds a float to an integer by rounding towards zero. * Pros: Faster than `toFixed(4)` because it doesn't involve a function call. * Cons: May produce incorrect results if the number is not exactly halfway between two integers. 3. **Bitwise NOT operator (`~~`)**: Rounds a float to an integer by performing a bitwise NOT operation on the product of the number and 10,000. * Pros: Very fast because it's a simple bitwise operation. * Cons: May be less readable than other approaches, and may produce incorrect results if not implemented carefully. **Library** None of these tests use any external libraries beyond what's included in JavaScript (e.g., `Math`). **Special JS features** The only special feature used here is the bitwise NOT operator (`~~`). This operator performs a bitwise NOT operation on its operand, which is equivalent to multiplying it by -1 and then converting it to an integer. **Benchmark preparation code** The benchmark preparation code simply defines a variable `someFloat` with value 0.123456789. **Other alternatives** If the tests were modified to use other rounding algorithms or methods, some alternative approaches could be: * Using a custom rounding function * Implementing a specialized rounding algorithm (e.g., "banker's rounding" for financial applications) * Using a library like ` Decimal.js` that provides a more precise and robust way of working with floating-point numbers. However, it's worth noting that the specific tests and options being compared are likely intended to highlight the performance differences between these three approaches.
Related benchmarks:
Precision rounding
toFixed vs toPrecision vs bitwise 2
Decimales para sat
toFixed vs toPrecision 3
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