Benchmark: Js Search - String StartsWith vs Includes

Tests:

Starts With
var a = 'hello#a#bc#helloa'; var b = a.startsWith('helloa');
Index Of
var a = 'hello#a#bc#helloa'; var b = a.indexOf('helloa');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Starts With
Index Of

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/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Starts With	106189552.0 Ops/sec
Index Of	232814544.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided JSON represents a benchmark test called "Js Search - String StartsWith vs Includes". This test compares the performance of two string search methods: `startsWith` and `indexOf`.

**Options Compared**

Two options are compared:

1. **`startsWith`**: A method that checks if a string starts with a specified value.
2. **`indexOf`**: A method that searches for a specified value within a string and returns its index.

**Pros and Cons of Each Approach**

*   `startsWith`:
    *   Pros: More concise, easier to read, and faster than `indexOf`.
    *   Cons: May not be as widely supported in older browsers or versions.
*   `indexOf`:
    *   Pros: Wide browser support, including older versions. However, it may be slower due to its more complex implementation.
    *   Cons: Longer code and potentially less readable.

**Library Used**

None of the provided benchmark tests uses a specific library. The `startsWith` and `indexOf` methods are built-in JavaScript functions.

**Special JS Feature or Syntax (Not Applicable)**

No special JS feature or syntax is used in these test cases.

**Other Alternatives**

In addition to `startsWith` and `indexOf`, other string search methods include:

*   `includes`: A more modern method that checks if a string includes a specified value. While not built-in, it's implemented by many browsers.
*   Regular expressions (regex): Can be used for complex pattern matching and searching.

For microbenchmarking, `startsWith` and `indexOf` are popular choices due to their simplicity, conciseness, and widespread browser support.

**Benchmark Preparation Code**

The provided JSON does not contain any script preparation code. This means that the benchmark tests start with an empty JavaScript scope and execute the test functions without any additional setup or dependencies.

**Individual Test Cases**

Each individual test case represents a single benchmark test:

1.  **"Starts With"`**:
    *   The `Benchmark Definition` specifies a string value `a` with embedded values, such as `'hello#a#bc#helloa'`. Then it creates two variables: `var b = a.startsWith('helloa');`.
    *   This test evaluates the performance of the `startsWith` method.
2.  **"Index Of"`**:
    *   The `Benchmark Definition` specifies a string value `a` with embedded values, such as `'hello#a#bc#helloa'`. Then it creates two variables: `var b = a.indexOf('helloa');`.
    *   This test evaluates the performance of the `indexOf` method.

In summary, this benchmark compares the performance of `startsWith` and `indexOf` methods for searching strings in JavaScript. The results provide insights into which method is faster and more suitable for different use cases.

Related benchmarks:

Js Search - String StartsWith vs Includes (version: 0)

Comparing performance of: Starts With vs Index Of

Created: 4 years ago by: Guest

Jump to the latest result

Starts With

Index Of

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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