Benchmark: IndexOf vs Includes vs Bitwise in string 2

Script Preparation code:

var string = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.'

Tests:

IndexOf
string.indexOf('tempor') != -1
Includes
string.includes('tempor')
Bitwise
~string.indexOf('tempor')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Includes
Bitwise

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 JSON and explain what is being tested.

**Benchmark Definition**

The benchmark is designed to compare three different approaches for searching a specific substring within a given string:

1. `string.indexOf('tempor') != -1`
2. `string.includes('tempor')`
3. `~string.indexOf('tempor')`

These approaches are being compared to measure their performance and execution speed.

**Approaches**

Here's a brief overview of each approach:

1. **`string.indexOf('tempor') != -1`**: This method searches for the first occurrence of `'tempor'` in the string and returns its index if found, or `-1` if not found. The `!= -1` part is used to check if the substring was actually found.
2. **`string.includes('tempor')`**: This method checks if the string includes the specified substring without searching for it from the beginning. It returns `true` if the substring is found, and `false` otherwise.
3. **`~string.indexOf('tempor')`**: The tilde (`~`) operator inverts the bits of the result returned by `indexOf()`. If `indexOf()` returns a non-negative value, ~x will be -1; if it returns -1, ~x will be 0. This approach is equivalent to `includes()` but uses bitwise operations.

**Pros and Cons**

Here's a brief analysis of each approach:

* **`string.indexOf('tempor') != -1`**: Pros: Simple, widely supported. Cons: Can return unexpected results if the substring appears multiple times.
* **`string.includes('tempor')`**: Pros: More efficient than `indexOf()`, returns immediately if found. Cons: Only checks for exact matches; may not be suitable for more complex searching scenarios.
* **`~string.indexOf('tempor')`**: Pros: Similar to `includes()` but uses bitwise operations, can be faster in some cases. Cons: Less intuitive, may not work as expected due to browser inconsistencies.

**Library Usage**

None of the provided benchmark definitions use external libraries.

**Special JS Features or Syntax**

The tilde (`~`) operator is a special JavaScript operator that is used to invert the bits of a value. It's not commonly used in everyday coding but can be useful in certain performance-critical scenarios.

**Alternatives**

Other alternatives for searching substrings in strings include:

* Using regular expressions with `RegExp.test()` or `String.match()`
* Implementing your own substring search algorithm using loops and conditional statements
* Using specialized libraries like String.prototype.startsWith(), String.prototype.endsWith()

Keep in mind that the choice of approach depends on the specific requirements of your project, such as performance considerations, code readability, and browser support.

Related benchmarks:

IndexOf vs Includes vs Bitwise in string 2 (version: 0)

Banana

Comparing performance of: IndexOf vs Includes vs Bitwise

Created: 2 years ago by: Guest

Jump to the latest result

IndexOf

Includes

Bitwise

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):