Benchmark: indexOf vs multiple ===

Script Preparation code:

var test = 'foo';

Tests:

equals
test === 'foo' || test === 'bar';
indexOf
['foo','bar'].indexOf(test) >= 0;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
equals
indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/119.0

Browser/OS: Firefox 119 on Windows

View result in a separate tab

Test name	Executions per second
equals	1533685248.0 Ops/sec
indexOf	72026264.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the JavaScript microbenchmark you provided.

**Benchmark Overview**

The benchmark measures the performance of two different approaches for checking if a string is equal: using the `===` operator or using the `indexOf()` method with an initial value.

**Approaches Compared**

There are two test cases:

1. **equals**: This test case uses the `===` operator to check if the input string is equal to either `'foo'` or `'bar'`.
2. **indexOf**: This test case uses the `indexOf()` method with an initial value of 0 to find the index of the first occurrence of the input string in a predefined array `['foo', 'bar']`.

**Pros and Cons of Each Approach**

1. **equals (using ===)**:
	* Pros: Simple, straightforward, and easy to understand.
	* Cons: May be slower due to the overhead of comparing primitive values, especially for large inputs.
2. **indexOf**:
	* Pros: Can handle larger input sizes more efficiently, as it only needs to search a subset of the string.
	* Cons: Requires the `indexOf()` method, which may introduce additional overhead or dependencies on certain browsers.

**Other Considerations**

Both approaches have some common pitfalls:

* The `equals` test case assumes that the input string is always one of the predefined values, which might not be true for all use cases.
* The `indexOf` test case uses a hardcoded array, which may make it less representative of real-world scenarios where arrays or strings are dynamic.

**Library and Special JS Features**

In this benchmark, no libraries are used, and there are no special JavaScript features like async/await, generators, or destructuring. The code is straightforward and basic.

**Alternative Approaches**

If you want to explore other approaches, here are a few ideas:

* Using regular expressions: You could use the `test === /foo|bar/i` syntax to check if the input string matches either `/foo/` or `/bar/` with case insensitivity.
* Using `String.prototype.includes()`: This method can be used to check if the input string is included in a given array of strings. For example, `'foo'.includes('bar')`.
* Using bitwise operations: You could use bit manipulation techniques to compare strings, which might offer performance benefits for certain use cases.

Keep in mind that these alternative approaches may have different trade-offs and requirements, and their performance characteristics may vary depending on the specific use case and browser.

Related benchmarks:

indexOf vs multiple === (version: 0)

Comparing performance of: equals vs indexOf

Created: one year ago by: Guest

Jump to the latest result

equals

indexOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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