Benchmark: Performance Test: substring vs substr vs slicey

Script Preparation code:

var string = "Iam the god of hellfire, and I bring you...";
var search = "Iam";

function startsWith(haystack, needle) {
        return haystack.slice(0, needle.length) === needle;
    }

Tests:

slice
var poly = startsWith(string, search);
substring
var natiiv = string.startsWith(search);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substring

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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I'll break down the benchmark definition and test cases for you.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that compares the performance of three different string manipulation functions: `startsWith`, `substring`, and "slicey" (which is likely a custom implementation).

Here's what each function does:

* `startsWith(str, needle)`: Returns true if the string `str` starts with the substring `needle`.
* `string.startsWith(search)`: This method is part of the JavaScript String prototype and returns true if the string starts with the specified value.
* "slicey" (custom implementation): Not shown in the JSON, but presumably a custom function that performs slicing on strings.

**Options Compared**

The benchmark compares two options:

1. `string.startsWith(search)`: This is the native JavaScript method for checking if a string starts with a certain value.
2. `slice()` followed by a conditional statement: This approach involves calling the `slice()` method to extract a substring from the original string and then comparing it with the search value using a conditional statement.

**Pros and Cons**

1. **Native JavaScript Method (`string.startsWith(search)`)**:
	* Pros: Fast, efficient, and widely supported.
	* Cons: May not be as flexible or customizable as other approaches.
2. **Slicey (Custom Implementation)**:
	* Pros: Can be highly optimized for specific use cases or hardware architectures.
	* Cons: Requires custom implementation, which can add complexity and overhead.

**Other Considerations**

* The benchmark does not consider the impact of regular expressions on performance.
* It also doesn't account for string length, which could affect the performance of `startsWith` or "slicey".

**Library Used (if any)**

None mentioned in the provided JSON. However, some libraries like Lodash might provide similar functionality (`_.startsWith()`).

**Special JS Feature/Syntax**

The benchmark uses a JavaScript feature called "arrow functions" (e.g., `returns haystack.slice(0, needle.length) === needle;`) and modern syntax features like template literals (`var search = \"Iam\";`).

Overall, the benchmark provides a useful comparison of different string manipulation approaches in JavaScript, allowing users to evaluate performance and choose the best option for their specific use case.

Related benchmarks:

Performance Test: substring vs substr vs slicey (version: 0)

Comparing performance of: slice vs substring

Created: 2 years ago by: Guest

Jump to the latest result

slice

substring

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):