Benchmark: js mul vs pow - MeasureThat.net

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Tests:

pow
/*When writing async/deferred tests, use `deferred.resolve()` to mark test as done*/ var x = 54 ** 2;
mul
var x = 54 * 54;

Rendered benchmark preparation results:

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Previous results

Test case name	Result
pow
mul

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
pow	138950320.0 Ops/sec
mul	138396384.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON compares two methods of performing exponentiation in JavaScript: using the exponentiation operator (`**`) and multiplication (`*`). The benchmark specifically tests the performance of these two approaches when squaring the number 54.

### Options Compared

1. **Exponentiation Operator (`**`)**:
   - Code: `var x = 54 ** 2;`
   - This syntax is a part of ECMAScript 2016 (ES7) and allows you to raise a number to the power of another number. In this case, it effectively performs \(54^2\).

2. **Multiplication (`*`)**:
   - Code: `var x = 54 * 54;`
   - This syntax simply multiplies 54 by itself to achieve the same result as squaring.

### Pros and Cons of Each Approach

**1. Exponentiation Operator (`**`):**
   - **Pros**:
     - Cleaner and more intuitive syntax, especially for developers familiar with mathematical notation.
     - More flexible for raising numbers to any power, rather than just squaring.
   - **Cons**:
     - Slightly less performant, as observed in this benchmark, especially in terms of execution speed compared to multiplication. 
     - Slightly more overhead due to the operation being more complex conceptually than simple multiplication.

**2. Multiplication (`*`):**
   - **Pros**:
     - Faster execution time, at least for operations like squaring, as shown in the results (138,950,320 vs. 138,396,384 executions per second).
     - Straightforward approach with no additional syntactical overhead; highly optimized in many JavaScript engines.
   - **Cons**:
     - Less readable when used for more complex powers (e.g., \(54^3\)) as you'll need to multiply multiple times.
     - Less flexibility, as you would need to write additional code to handle cases other than squaring.

### Results Overview

From the benchmark results provided:

- The `pow` test (using the `**` operator) executed **138,950,320** times per second.
- The `mul` test (using the multiplication operator `*`) executed **138,396,384** times per second.

The `pow` method outperformed the `mul` method in this particular test, which is somewhat counterintuitive given typical performance expectations. This highlights the importance of running performance tests, as benchmarks can yield differing results based on the context and implementation of the JavaScript engine.

### Other Considerations

- **JavaScript Engine Optimizations**: Different JavaScript engines (like V8 in Chrome, SpiderMonkey in Firefox, etc.) can optimize operations differently. Hence, performance benchmarks may vary across browsers and platforms.
- **Use Case**: While both methods yield the same result to calculate \(54^2\), the choice might depend on code readability and specific scenarios within larger applications. For most simple arithmetic cases, multiplication is generally preferred for performance.

### Alternatives

Other alternatives to consider for exponentiation in JavaScript include:

- **Math.pow()**: For more complex exponentiation scenarios, such as calculating \(x^y\) where \(y\) is dynamic:
  ```javascript
  var x = Math.pow(54, 2);
  ```
  This method is particularly useful when the exponent is not a static integer.

- **Using BigInt** for large integer calculations, although this does not directly relate to the current benchmark, it’s worth mentioning for scenarios where integer precision is crucial.

Overall, the choice between these methods should take into account not just performance but also the context and requirements of the code being written.

Related benchmarks:

js mul vs pow (version: 1)

Comparing performance of: pow vs mul

Created: one year ago by: Guest

Jump to the latest result

pow

mul

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):