Benchmark: Math.floor vs |0 vs (int)

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>

Previous results

Test case name	Result
Math.floor
\|0

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

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.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Linux; Android 7.0; LG-H840 Build/NRD90U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.83 Mobile Safari/537.36

Browser/OS: Chrome Mobile 58 on Android 7.0

View result in a separate tab

Test name	Executions per second
Math.floor	1398848.2 Ops/sec
\|0	18592570.0 Ops/sec

Related benchmarks:

Math.floor vs |0 vs (int) (version: 0)

Comparing performance of: Math.floor vs |0

Created: 7 years ago by: Guest

Jump to the latest result

Math.floor

|0

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):