Benchmark: IndexOf boolean vs Includes

Script Preparation code:

var array = ["mat", "then", "social", "service", "forest", "demand", "limb", "chief", "pan", "over", "resign", "help", "wise", "ride", "sun", "further", "woman", "quantity", "widow", "stuff", "check", "limb", "become", "often", "animal", "control", "spend", "new", "wheat", "bare", "perform", "thread", "world", "inward", "handle", "creep", "student", "chair", "during", "visit", "measure", "wrap", "anyone", "confess", "somebody", "faith", "show", "somebody", "universe", "aim"]

Tests:

IndexOf
array.indexOf('resign') > -1
Includes
array.includes('resign')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Includes

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmarking data and explain what's being tested, compared, and some pros and cons of each approach.

**What is being tested?**

The benchmark measures the performance difference between two JavaScript methods: `indexOf` and `includes`. Specifically, it tests whether these methods can find a word ("resign") within an array of 50 elements.

**Options compared**

There are two options being compared:

1. **`array.indexOf('resign') > -1`**: This uses the traditional `indexOf` method, which returns the index of the first occurrence of the specified element, or `-1` if it's not found.
2. **`array.includes('resign')`**: This uses the `includes` method, which returns a boolean value indicating whether the array contains the specified element.

**Pros and cons of each approach**

1. **`indexOf` method**
	* Pros:
		+ Can be used to get an index if found (useful for indexing or slicing arrays).
		+ Has been available in JavaScript since its inception.
	* Cons:
		+ Returns `-1` on false positives (e.g., empty strings), which can lead to unexpected behavior.
		+ May perform worse than `includes` due to additional checks and potential overflows.
2. **`includes` method**
	* Pros:
		+ Returns a boolean value, making it easier to handle results in a consistent way.
		+ More efficient than `indexOf` since it avoids unnecessary index calculations.
	* Cons:
		+ Only available in ECMAScript 2019 and later versions (not supported in older browsers).
		+ May have slower performance compared to `indexOf` for very large arrays.

**Library usage**

None of the provided benchmarking data mentions any external libraries, but it's worth noting that modern JavaScript engines often rely on internal optimizations and caching for common methods like `includes`. If you were to use a library or framework that provides optimized implementations of these methods (e.g., Lodash), your results might vary.

**Special JS features or syntax**

There are no special features or syntax mentioned in the provided data, but it's worth noting that modern JavaScript engines support various advanced features like async/await, Promises, and Web APIs. If you were to add these features to your benchmarking code, it could affect the results.

**Alternatives**

Other alternatives for measuring performance differences between `indexOf` and `includes` methods include:

1. **Using a testing framework**: Libraries like Jest or Mocha can provide more advanced testing capabilities, including parallel execution of tests.
2. **Writing custom benchmarking tools**: You can create your own benchmarking tool using JavaScript and the `performance.now()` function to measure performance.
3. **Utilizing online benchmarking platforms**: Websites like jsperf (now deprecated) or Benchmark.js offer pre-built benchmarking frameworks for testing JavaScript code.

Keep in mind that each alternative has its own strengths and weaknesses, and choosing the right one depends on your specific needs and requirements.

Related benchmarks:

IndexOf boolean vs Includes (version: 0)

if 50 elements array contains some word

Comparing performance of: IndexOf vs Includes

Created: 5 years ago by: Guest

Jump to the latest result

IndexOf

Includes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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