Benchmark: startswith vs split and equal

Tests:

Startswith
const key = 'noneofit_fbalbegl' if (key.startsWith('latest_')) { delay = 10000 } else if (key.startsWith('games-live')) { delay = 3000 } else if (key.startsWith('news_')) { delay = 10000 } else if (key.startsWith('highlight_')) { delay = 10000 } else if (key.startsWith('schedules-day_')) { delay = 10000 } else if (key.startsWith('video_')) { delay = 10000 }
Split and equal
const key = 'games-live_fbalbegl' const [type] = key.split('_') if (type === 'latest') { delay = 10000 } else if (type === 'games-live') { delay = 3000 } else if (type === 'news') { delay = 10000 } else if (type === 'highlight') { delay = 10000 } else if (type === 'schedules-day') { delay = 10000 } else if (type === 'video') { delay = 10000 }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Startswith
Split and equal

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 YaBrowser/24.7.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Windows

View result in a separate tab

Test name	Executions per second
Startswith	67590192.0 Ops/sec
Split and equal	5145027.0 Ops/sec

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 explain what's being tested.

**Benchmark Definition**

The benchmark is comparing two approaches to check if a string starts with a certain substring:

1. `startswith`
2. `split` + `equal`

**What is tested?**

In this benchmark, we're testing how efficient each approach is in checking if a given key starts with one of several predefined substrings (e.g., "latest_", "games-live", etc.). The test data consists of various keys that match these substrings.

**Options compared:**

1. **`startswith`**: This method checks if the string starts with an exact substring using the `startsWith()` method.
2. **`split` + `equal`**: This approach splits the key into parts using the `_` character as a separator and then compares each part to the predefined substrings.

**Pros and Cons:**

1. **`startswith`**:
	* Pros:
		+ Simple and straightforward implementation.
		+ Fast execution time since it only checks for an exact match.
	* Cons:
		+ May not be efficient for keys with many leading characters, as it would check each character individually.
2. **`split` + `equal`**:
	* Pros:
		+ More flexible than `startswith`, as it can handle multiple substrings and their order.
		+ Can be more efficient for keys with a specific pattern (e.g., "latest_").
	* Cons:
		+ Requires more computational resources since it needs to split the string and compare each part.

**Library usage**

There is no explicit library mentioned in the benchmark definition, but `split()` method uses the built-in JavaScript array method `String.prototype.split()`, which splits a string into an array of substrings based on a specified separator. The `equal` comparison is also a built-in JavaScript method.

**Special JS feature or syntax**

There are no special JavaScript features or syntax mentioned in this benchmark definition.

**Other alternatives**

Other approaches to check if a string starts with a certain substring might include:

* Using regular expressions (`regex`)
* Using an array of substrings and checking for each one using `includes()`
* Using a custom implementation that uses bitwise operations

However, the `startswith` and `split` + `equal` approaches are common and efficient methods for this specific use case.

In summary, this benchmark tests the efficiency of two approaches to check if a string starts with a certain substring: `startswith` (an exact match) vs. `split` + `equal` (a more flexible approach).

Related benchmarks:

startswith vs split and equal (version: 0)

Comparing performance of: Startswith vs Split and equal

Created: one year ago by: Guest

Jump to the latest result

Startswith

Split and equal

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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