Benchmark: str[i] before startsWith

Script Preparation code:

function get_data(){
  const res = "abc-def-ghi-\u26C6-jkl-mno"
  return res
}

Tests:

[MATCH] check str[i] before startsWith
const str = get_data() const res = str[12] === "\u26C6" && str.startsWith("abc-def-ghi-\u26C6")
[MATCH] startsWith immediatly
const str = get_data() const res = str.startsWith("abc-def-ghi-\u26C6")
[NOT MATCH] check str[i] before startsWith
const str = get_data() const res = str[14] === "\u26C6" && str.startsWith("abc-def-ghi-x-\u26C6")
[NOT MATCH] startsWith immediatly
const str = get_data() const res = str.startsWith("abc-def-ghi-x-\u26C6")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
[MATCH] check str[i] before startsWith
[MATCH] startsWith immediatly
[NOT MATCH] check str[i] before startsWith
[NOT MATCH] startsWith immediatly

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Definition**

The benchmark is defined in JSON format, which provides information about the test case. The essential fields are:

* `Name`: A unique identifier for the benchmark.
* `Description`: An optional description of the benchmark (not applicable in this case).
* `Script Preparation Code`: A JavaScript code snippet that prepares the data used in the benchmark. In this case, it returns a string containing Unicode characters.
* `Html Preparation Code`: An optional HTML code snippet to prepare the environment for the test (not applicable in this case).

**Test Cases**

The benchmark consists of four individual test cases:

1. `[MATCH] check str[i] before startsWith`
2. `[MATCH] startsWith immediatly`
3. `[NOT MATCH] check str[i] before startsWith`
4. `[NOT MATCH] startsWith immediatly`

Each test case has a unique `Benchmark Definition` and a corresponding `Test Name`.

**Options Compared**

In each test case, the following options are compared:

* Accessing a character at a specific index (`str[i]`) before checking if the string starts with a certain substring (`startsWith`).
* Checking if the string starts with a certain substring immediately (`startsWith immediatly`).

The goal of these tests is to measure the performance difference between accessing a character at a specific index and checking if the string starts with a certain substring.

**Pros and Cons of Different Approaches**

1. **Accessing `str[i]` before `startsWith`:**
	* Pros: Can be more efficient for large strings, as it avoids the overhead of the `startsWith` method.
	* Cons: May not work correctly if the character is not at the beginning of the string or if the substring is not found.
2. **`startsWith immediatly`:**
	* Pros: Always accurate and efficient, as it uses an optimized algorithm to check for the substring.
	* Cons: May be slower than accessing a specific index for large strings.

**Library and Special JS Features**

There are no libraries used in this benchmark. However, some test cases use Unicode characters (`\u26C6`), which might require special handling or interpretation by the JavaScript engine.

**Other Alternatives**

To measure the performance of string access and `startsWith` methods, alternative approaches could include:

* Using a different programming language or framework that optimizes for strings.
* Implementing a custom string processing function to compare with the built-in `startsWith` method.
* Measuring the performance of regular expressions instead of substring matching.

Keep in mind that these alternatives might not be relevant to this specific benchmark and its test cases.

Related benchmarks:

str[i] before startsWith (version: 0)

Comparing performance of: [MATCH] check str[i] before startsWith vs [MATCH] startsWith immediatly vs [NOT MATCH] check str[i] before startsWith vs [NOT MATCH] startsWith immediatly

Created: 4 years ago by: Guest

Jump to the latest result

[MATCH] check str[i] before startsWith

[MATCH] startsWith immediatly

[NOT MATCH] check str[i] before startsWith

[NOT MATCH] startsWith immediatly

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):