Benchmark: Bitwise vs String feature flags

Script Preparation code:

var BITWISE_FEATURE_A = 1;
var BITWISE_FEATURE_B = BITWISE_FEATURE_A<<1;
var BITWISE_FEATURE_C = BITWISE_FEATURE_B<<1;
var BITWISE_ENABLED = BITWISE_FEATURE_A ^ BITWISE_FEATURE_C;

var STRING_FEATURE_A = "yellow_scrollbar";
var STRING_FEATURE_B = "green_box";
var STRING_FEATURE_C = "blue_banner";
var STRING_ENABLED = STRING_FEATURE_A + STRING_FEATURE_C;

Tests:

Bitwise - Existing
BITWISE_ENABLED & BITWISE_FEATURE_A === BITWISE_FEATURE_A
Bitwise - Non-Existing
BITWISE_ENABLED & BITWISE_FEATURE_B === BITWISE_FEATURE_B
String - Existing
STRING_ENABLED.indexOf(STRING_FEATURE_C) > 0
String - Non-Existing
STRING_ENABLED.indexOf(STRING_FEATURE_B) > 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Bitwise - Existing
Bitwise - Non-Existing
String - Existing
String - Non-Existing

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the provided Benchmark Definition json and explain what is tested, compared options, pros and cons of those approaches, and other considerations.

**Benchmark Definition**

The benchmark measures the performance difference between using bitwise operations (`BITWISE_ENABLED` and `BITWISE_FEATURE_A`) versus string manipulation (`STRING_ENABLED.indexOf(STRING_FEATURE_C)`).

There are two sets of tests:

1. **Bitwise Tests**: These test whether a specific condition is true for each feature flag (`BITWISE_FEATURE_A`, `BITWISE_FEATURE_B`, and `BITWISE_FEATURE_C`). The conditions are:
	* `BITWISE_ENABLED & BITWISE_FEATURE_A === BITWISE_FEATURE_A` (existing)
	* `BITWISE_ENABLED & BITWISE_FEATURE_B === BITWISE_FEATURE_B` (non-existing)
2. **String Tests**: These test whether a specific feature flag (`STRING_FEATURE_C`) is present in the concatenated string `STRING_ENABLED`.

**Comparison Options**

The benchmark compares two approaches:

1. **Bitwise Operations**
	* Pros:
		+ Efficient and fast
		+ Less memory usage compared to strings
	* Cons:
		+ May be less readable and maintainable for complex conditions
		+ Limited support in some older browsers or platforms
2. **String Manipulation**
	* Pros:
		+ More readable and maintainable for complex conditions
		+ Wide support across modern browsers and platforms
	* Cons:
		+ Less efficient and slower compared to bitwise operations
		+ Higher memory usage

**Library Usage**

The benchmark uses the `indexOf()` method from JavaScript's built-in String object. This method is a part of the ECMAScript standard and is widely supported across modern browsers.

**Special JS Feature or Syntax**

There are no special features or syntax used in this benchmark, apart from using bitwise operations and string manipulation.

**Other Considerations**

When choosing between bitwise operations and string manipulation, consider the following:

* **Performance**: Bitwise operations are generally faster and more efficient.
* **Readability**: String manipulation is often more readable and maintainable for complex conditions.
* **Compatibility**: Ensure that both approaches work across all supported browsers and platforms.

**Alternatives**

If you need to optimize performance or readability in a different context, consider the following alternatives:

1. **Regex**: Use regular expressions (regex) for string matching instead of `indexOf()`.
2. **Template Literals**: Use template literals for string concatenation instead of the `+` operator.
3. **Array Methods**: Consider using array methods like `includes()` or `findIndex()` for faster and more efficient string manipulation.

In conclusion, this benchmark provides a clear comparison between bitwise operations and string manipulation in JavaScript. By understanding the pros and cons of each approach, developers can make informed decisions when optimizing their code for performance or readability.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Linux

View result in a separate tab

Test name	Executions per second
Bitwise - Existing	3257238.8 Ops/sec
Bitwise - Non-Existing	3212837.5 Ops/sec
String - Existing	4919244.0 Ops/sec
String - Non-Existing	4840980.5 Ops/sec

Related benchmarks:

Bitwise vs String feature flags (version: 0)

Comparing performance of: Bitwise - Existing vs Bitwise - Non-Existing vs String - Existing vs String - Non-Existing

Created: 6 years ago by: Guest

Jump to the latest result

Bitwise - Existing

Bitwise - Non-Existing

String - Existing

String - Non-Existing

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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