Benchmark: Is odd package vs simple function

Script Preparation code:

function isNumber(num) {
  if (typeof num === 'number') {
    return num - num === 0;
  }
  if (typeof num === 'string' && num.trim() !== '') {
    return Number.isFinite ? Number.isFinite(+num) : isFinite(+num);
  }
  return false;
};

var isOdd = (value) => {
  const n = Math.abs(value);
  if (!isNumber(n)) {
    throw new TypeError('expected a number');
  }
  if (!Number.isInteger(n)) {
    throw new Error('expected an integer');
  }
  if (!Number.isSafeInteger(n)) {
    throw new Error('value exceeds maximum safe integer');
  }
  return (n % 2) === 1;
};

var isOdd2 = (v) => ((v | 0) === v && v % 2 === 1);

var testData = Array.from({length: 40}, () => Math.floor(Math.random() * 40));

Tests:

is-odd package
let odd = 0 for (const v of testData) { if (isOdd(v)) odd++ }
simple function
let odd = 0 for (const v of testData) { if (isOdd2(v)) odd++ }
manually inlined
let odd = 0 for (const v of testData) { if ((v|0) === v && (v%2) === 1) odd++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
is-odd package
simple function
manually inlined

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its options.

**Overview**

The benchmark is designed to compare three approaches for determining whether a number is odd:

1. Using the `isOdd` function from an external library (the "Is odd package")
2. Implementing a simple function (`isOdd2`) inline
3. Manually inlining the check using bitwise operations (`(v|0) === v && (v%2) === 1`)

**Options Compared**

The benchmark compares the performance of these three approaches:

* **Using the `isOdd` library**: This option uses an external function from the "Is odd package" to determine whether a number is odd.
* **Simple Function (`isOdd2`)**: This option implements a simple function inline, which takes a single input `v` and returns a boolean value indicating whether it's odd.
* **Manually Inlined**: This option uses bitwise operations to check if the input `v` is odd. This approach avoids calling an external function or implementing a new function.

**Pros and Cons of Each Approach**

1. **Using the `isOdd` library**:
	* Pros: Easy to implement, reliable results.
	* Cons: External dependency, potential performance overhead due to function calls.
2. **Simple Function (`isOdd2`)**:
	* Pros: Inlined code, no external dependencies, easy to understand.
	* Cons: More complex implementation, may not be as efficient as bitwise operations.
3. **Manually Inlined**:
	* Pros: Fastest performance, minimal overhead, straightforward implementation.
	* Cons: Requires manual knowledge of bitwise operations, less readable than other approaches.

**Library Used**

The "Is odd package" is not a standard JavaScript library. After some research, I found that it's likely a custom implementation of the `isOdd` function. The purpose of this library is to provide a simple and reliable way to determine whether a number is odd. However, without more information about the library's source code or documentation, it's difficult to say more about its internal workings.

**Special JS Feature/Syntax**

The benchmark uses bitwise operations (`(v|0) === v && (v%2) === 1`) in the manually inlined approach. This syntax is a common pattern in JavaScript for determining whether a number is odd, as it avoids calling external functions or implementing new logic.

Overall, this benchmark provides a good starting point for understanding the performance implications of different approaches to determining whether a number is odd in JavaScript.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/117.0

Browser/OS: Firefox 117 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
is-odd package	1417727.0 Ops/sec
simple function	4452732.0 Ops/sec
manually inlined	5044005.0 Ops/sec

Related benchmarks:

Is odd package vs simple function (version: 0)

The "is-odd" package is weird but how much slower is it?

Comparing performance of: is-odd package vs simple function vs manually inlined

Created: one year ago by: Registered User

Jump to the latest result

is-odd package

simple function

manually inlined

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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