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Math.floor vs |0 vs (int)
(version: 0)
Comparing performance of:
Math.floor vs |0
Created:
9 years ago
by:
Guest
Go to the latest result
Tests:
Math.floor
var a = Math.floor(2+5.5);
|0
var a = (2+5.5)|0;
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
|0
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0
Browser/OS:
Firefox 137 on Windows
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<iframe src="https://measurethat.net/Embed?id=600570" width="100%" height="500px"></iframe>
Math.floor
932.7M/s
|0
904.8M/s
View exact numbers
Test name
Executions per second
✓
Math.floor
932,726,272 Ops/sec
|0
904,844,224 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the benchmark and its options. **What is being tested?** The benchmark measures the performance of two different ways to round down a decimal number: using the `Math.floor()` function, using the bitwise OR operator (`|`) with 0, and casting to an integer (`(int)`). **Options compared** There are three options being compared: 1. **`Math.floor()`**: This is a built-in JavaScript function that returns the largest integer less than or equal to the given number. 2. **`|0`**: This is a bitwise OR operator with 0, which performs a binary operation and then casts the result to an integer. In this case, it effectively rounds down the decimal number to the nearest integer. 3. ** `(int)`**: This is not a standard JavaScript syntax for casting to an integer. It's unclear what language or context this might be intended for, but in standard JavaScript, you would use `Math.floor()` or `|0` instead. **Pros and Cons** 1. **`Math.floor()`**: * Pros: Well-known function, widely supported, easy to read and understand. * Cons: May incur a small overhead due to the function call. 2. **`|0`**: * Pros: Fast and lightweight, doesn't incur the overhead of a function call. * Cons: Less readable than `Math.floor()`, may not be immediately clear what it does without context. 3. ** `(int)`**: * Pros: None ( unclear syntax). * Cons: Not standard JavaScript, likely to cause confusion and errors. **Library and syntax** There is no library involved in this benchmark. **Special JS feature or syntax** There is a special syntax used in the `|0` option, which is the bitwise OR operator (`|`). While this is a valid operator in JavaScript, it's not commonly used for rounding down decimal numbers. The `(int)` syntax is also non-standard and likely intended to simulate integer casting. **Other alternatives** If you wanted to round down a decimal number in JavaScript, other alternatives could include: * Using the `Math.round()` function with the `-1` option (e.g., `Math.round(x) - 0.5`) * Using the ternary operator (`x | 0`) * Implementing your own rounding algorithm using bitwise operations. Keep in mind that these alternatives may have different performance characteristics and readability compared to the options being benchmarked here.
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floor vs trunc vs bit shift
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