Benchmark: Array split vs string substring-1

Script Preparation code:

var s1 = "wefe.foo.bar";
var s2 = "foo";

Tests:

Array.split
var n1 = s1.split(".")[0]; var n2 = s2.split(".")[0];
Substring
var n1 = s1.substring(0, s1.indexOf(".")); var n2 = s2.substring(0, s2.indexOf("."));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.split
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):

LLMs can make mistakes. Check important info.

Let's dive into explaining the provided benchmark.

**Benchmark Overview**

The benchmark compares the performance of two approaches to extract a substring from a string: using `Array.prototype.split()` and using the `substring()` method with `indexOf()`. The test uses JavaScript, specifically a JavaScript version that allows for some features like async functions (not used in this case) but also some older syntax.

**Options Compared**

The benchmark tests two options:

1. **`Array.prototype.split()`**: This method splits a string into an array of substrings based on a specified separator. In this case, the separator is `.`.
2. **`substring()` with `indexOf()`**: This method extracts a substring from a string, starting from a specified start index and ending at a specified end index.

**Pros and Cons**

1. **`Array.prototype.split()`**:
	* Pros: Can handle multiple separators in a single call, can be used for array-like operations.
	* Cons: Creates an array of substrings, which might not be efficient for very large strings or exact substring matching.
2. **`substring()` with `indexOf()`**:
	* Pros: More control over the extracted substring (start and end indices), potentially more efficient for exact substring matching.
	* Cons: Requires a separate call to find the start index using `indexOf()`, which might incur additional overhead.

**Library and Special JS Features**

There is no explicit library mentioned in the benchmark. However, it's worth noting that JavaScript is a widely used language with many libraries and frameworks, so some tests might use external dependencies.

As for special JS features, there are none explicitly mentioned or required for this benchmark.

**Alternative Approaches**

Other approaches to extract a substring from a string could include:

1. **Using regular expressions**: `RegExp.prototype.exec()` can be used to find the first match of a pattern in a string.
2. **Using `String.prototype.includes()` and `String.prototype.indexOf()` separately**: This approach would require two separate calls, one for finding the start index and another for checking if the substring is present.

**Other Considerations**

When writing performance benchmarks like this one, it's essential to consider factors such as:

1. **Input size and complexity**: Varying input sizes and complexities can help ensure that the results are representative of real-world scenarios.
2. **Device and browser support**: Test on different devices and browsers to account for variations in JavaScript engine optimization and performance.
3. **Number of executions per second**: Measuring executions per second (like in this benchmark) provides insight into the overall performance of each approach.

By considering these factors and testing multiple approaches, you can gain a better understanding of the trade-offs involved when choosing a substring extraction method.

Related benchmarks:

Array split vs string substring-1 (version: 0)

Comparing performance of: Array.split vs Substring

Created: 5 years ago by: Guest

Jump to the latest result

Array.split

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):