Benchmark: startsWith vs string array

Script Preparation code:

var text = ':Benchmark name and description';

Tests:

startsWith
if (text.startsWith(':')) { }
string array
if (text[0] === ':') { }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
startsWith
string array

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

**Benchmark Overview**

The provided benchmark, named "startsWith vs string array", measures the performance difference between two approaches to check if a given string starts with a specific character or an array of characters. The test consists of two individual test cases: "startsWith" and "string array".

**Script Preparation Code**

The script preparation code is `var text = ':Benchmark name and description';`, which sets up a variable `text` containing the benchmark's name and description.

**Html Preparation Code**

There is no HTML preparation code, so we'll assume that the HTML for displaying the benchmark results will be provided separately.

**Test Cases**

The two test cases are:

1. **startsWith**: This test case checks if the string `text` starts with a colon (`:`) using the `startsWith()` method.
2. **string array**: This test case checks if the first character of the string `text` is equal to a colon (`:`) using array indexing (`text[0] === ':')`.

**Libraries and Features**

The "string array" test case uses JavaScript's array indexing feature, which allows accessing individual elements in an array.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in the provided benchmark definition. Both `startsWith()` and array indexing are standard JavaScript constructs.

**Pros and Cons of Approaches**

1. **.startsWith()**: This approach is more readable and concise, but it may incur a performance penalty due to its regular expression-based implementation.
2. **string array**: This approach uses array indexing, which can be slower than `startsWith()` because it involves accessing memory locations. However, it provides more control over the character being checked.

**Other Considerations**

When choosing between these approaches, consider the trade-off between performance and readability. If readability is a top priority, use `startsWith()`. If performance is critical, use array indexing.

**Alternatives**

Other alternatives for checking if a string starts with a specific character or an array of characters include:

* Using a regular expression object (`new RegExp(':')`)
* Using the `indexOf()` method (`text.indexOf(':') === 0`)
* Using a library like Lodash's `startsWith()` function

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the approaches used in the provided benchmark.

In summary, the "startsWith vs string array" benchmark measures the performance difference between two approaches to check if a given string starts with a specific character or an array of characters. The test cases use standard JavaScript constructs, and users should consider factors like readability and performance when choosing between these approaches.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Browser/OS: Firefox 65 on Windows 7

View result in a separate tab

Test name	Executions per second
startsWith	7558175.0 Ops/sec
string array	49086928.0 Ops/sec

Related benchmarks:

startsWith vs string array (version: 0)

Comparing performance of: startsWith vs string array

Created: 5 years ago by: Guest

Jump to the latest result

startsWith

string array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):