Benchmark: Is odd - MeasureThat.net

Tests:

Bitwise
const odd = i => !!(~~i & 1); odd(13);
Modulo
const odd = i => i % 2; odd(13);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Bitwise
Modulo

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Windows

View result in a separate tab

Test name	Executions per second
Bitwise	132771200.0 Ops/sec
Modulo	136549696.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in this JavaScript microbenchmark.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches for checking if a number is odd: using bitwise operations (`Bitwise`) and modulo arithmetic (`Modulo`).

**Script Preparation Code**

Since there is no Script Preparation Code provided, we can assume that it's an empty string or not applicable.

**Html Preparation Code**

Similarly, since there is no Html Preparation Code provided, we can also assume that it's not applicable.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. **Bitwise**: This approach uses bitwise operations to check if a number is odd. The benchmark script defines a function `odd` that takes an integer `i` as input and returns the result of the bitwise AND operation between `i` and 1, negated (`!(!(~~i & 1))`). The benchmark calls this function with the argument 13.
2. **Modulo**: This approach uses modulo arithmetic to check if a number is odd. The benchmark script defines a function `odd` that takes an integer `i` as input and returns the result of the modulo operation between `i` and 2 (`i % 2`). The benchmark calls this function with the argument 13.

**Library Used**

In both test cases, there is no explicit library used. However, it's worth noting that modern JavaScript engines often have built-in functions for bitwise operations (e.g., `>>`, `<<`, `&`, etc.) and modulo arithmetic (`%`).

**Special JS Feature or Syntax**

There are no special JS features or syntax mentioned in the benchmark definition.

**Pros and Cons of Different Approaches**

1. **Bitwise Approach**
	* Pros:
		+ May be faster since it uses a single bitwise operation.
		+ Can be more efficient for large numbers, as it avoids the overhead of function calls.
	* Cons:
		+ Less intuitive for developers who are not familiar with bitwise operations.
		+ May not work correctly for negative numbers or non-integer values.
2. **Modulo Approach**
	* Pros:
		+ Easier to understand and implement, especially for those familiar with modulo arithmetic.
		+ Works correctly for negative numbers and non-integer values.
	* Cons:
		+ May be slower since it involves an additional function call.

**Other Alternatives**

Other approaches to check if a number is odd include:

1. Using the `Math.floor` and `Math.sqrt` functions: `Math.floor(Math.sqrt(i)) === Math.ceil(Math.sqrt(i - 0.5))`
2. Using conditional statements or if-else expressions
3. Using a separate function that takes an integer as input and returns a boolean indicating whether it's odd.

However, these approaches may not be as efficient or optimized for performance as the bitwise or modulo approach used in this benchmark.

**Benchmark Results**

The latest benchmark results show that the `Modulo` approach performs slightly better than the `Bitwise` approach on this particular test case.

Related benchmarks:

Is odd (version: 0)

Comparing performance of: Bitwise vs Modulo

Created: 8 years ago by: Guest

Jump to the latest result

Bitwise

Modulo

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):