Benchmark: mybencmark1121222423412

Script Preparation code:

var url = "https://normalsozluk.com/b/normal-sozluk-yazarlarindan-ingilizce-mizah-paylasimlari--262427?page=40";
var match = "https://normalsozluk.com/b/";
var startswith = 0;
var indexof = 0;
var regex = 0;

Tests:

startswith
for (let i = 0; i < 10000; ++i) { if (url.startsWith(match)) { ++startswith; } }
indexof
for (let i = 0; i < 10000; ++i) { if (url.indexOf(match) != -1) { ++indexof; } }
regex
for (let i = 0; i < 10000; ++i) { if (/^https:\/\/normalsozluk\.com\/b\//.test(match)) { ++regex; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
startswith
indexof
regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

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**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net. The benchmark compares the execution performance of three different approaches to check if a given string starts with a specific substring.

**Approaches Compared**

1. **`startsWith` method**: This approach uses the `startsWith()` method, which is a built-in JavaScript method that checks if a string starts with another string.
2. **`indexOf` method with `!= -1` condition**: This approach uses the `indexOf()` method to find the index of the first occurrence of the substring in the original string. If the index is not -1 (indicating no match), it increments the counter.
3. **Regular expression (`regex`) test**: This approach uses a regular expression to match the substring at the beginning of the string.

**Pros and Cons of Each Approach**

* **`startsWith` method**:
	+ Pros: Simple, efficient, and widely supported.
	+ Cons: May not be as flexible as other approaches for certain use cases.
* **`indexOf` method with `!= -1` condition**:
	+ Pros: Can handle substrings at any position in the string.
	+ Cons: May be slower than the `startsWith` method due to the additional lookup.
* **Regular expression (`regex`) test**:
	+ Pros: Highly flexible, can match complex patterns, and efficient for large strings.
	+ Cons: Requires knowledge of regular expressions, which can add complexity.

**Library Used**

In this benchmark, none of the approaches use a specific JavaScript library. However, it's worth noting that if you were to implement the regular expression test using a library like `regex-escape` or `regex-test`, it could provide additional features and performance optimizations.

**Special JS Feature/Syntax**

None of the approaches in this benchmark rely on any special JavaScript features or syntax beyond the standard ECMAScript syntax. The `startsWith` method is a built-in function, while the `indexOf` method with the `!= -1` condition uses the standard `indexOf()` method without any additional libraries.

**Alternative Approaches**

Other alternative approaches to check if a string starts with a specific substring could include:

* Using a lookup table or precomputed values for common substrings.
* Utilizing a library like `fast-string-starts` which provides an optimized implementation of the `startsWith` method.
* Implementing a custom solution using bitwise operations, which can be more efficient than the built-in methods.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your use case.

Related benchmarks:

mybencmark1121222423412 (version: 0)

Comparing performance of: startswith vs indexof vs regex

Created: 2 years ago by: Guest

Jump to the latest result

startswith

indexof

regex

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):