Benchmark: Check first character 2

Tests:

charAt
const alphabet = 'abcdefghijklmnopqrstuvwxyz'; alphabet.charAt(0) === 'a';
startsWith
const alphabet = 'abcdefghijklmnopqrstuvwxyz'; alphabet.startsWith('a');
string index
const alphabet = 'abcdefghijklmnopqrstuvwxyz'; alphabet[0] === 'a';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
charAt
startsWith
string index

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The provided JSON represents a benchmark test case on MeasureThat.net, which measures the performance of three different string comparison methods: `charAt`, `startsWith`, and indexing (`[0]`) in JavaScript.

**Comparison options**

The three comparison options are:

1. **`charAt()`**: This method returns the character at a specified index in the string.
2. **`startsWith()`**: This method checks if a string starts with another string.
3. **Indexing (`[0]`)**: This is simply accessing the first element of an array (or the first character of a string).

**Pros and cons**

Here's a brief overview of each option:

* `charAt()`: Pros: simple, efficient for small strings; Cons: slow for large strings due to indexing overhead.
* `startsWith()`: Pros: efficient for large strings with matching prefixes; Cons: slower than direct indexing for short strings.
* Indexing (`[0]`): Pros: fast and memory-efficient; Cons: not directly applicable to all string types (e.g., arrays of objects).

**Library usage**

There is no explicit library mentioned in the benchmark definition. However, `startsWith()` likely relies on some internal implementation details or library optimizations.

**Special JavaScript features**

None are explicitly mentioned in this benchmark.

**Benchmark preparation code**

The provided script preparation code is empty, which means the test case starts with an empty string: `"const alphabet = 'abcdefghijklmnopqrstuvwxyz';\r\nalphabet.charAt(0) === 'a';"` and variations of it. This allows MeasureThat.net to start fresh for each execution.

**Other alternatives**

Some alternative comparison methods that could be included in a benchmark might include:

* `includes()`: checks if a string includes another substring
* `match()`: returns an array of matches for a regular expression pattern in the string
* Direct comparison (`"abc" === "abc"`): simple but not as efficient as other methods for large strings.

In summary, this benchmark measures the performance of three different string comparison methods: `charAt`, `startsWith`, and indexing. The pros and cons of each method are considered, and there is no explicit library usage mentioned.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser/OS: Chrome 115 on Linux

View result in a separate tab

Test name	Executions per second
charAt	1446127104.0 Ops/sec
startsWith	1467688576.0 Ops/sec
string index	1450727424.0 Ops/sec

Related benchmarks:

Check first character 2 (version: 0)

Comparing performance of: charAt vs startsWith vs string index

Created: 2 years ago by: Guest

Jump to the latest result

charAt

startsWith

string index

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):