Benchmark: CUSTOM substring vs slice

Script Preparation code:

var inputText = "THIS IS A TEST OF PIECES OF STRING";
var indexOf = inputText.indexOf("PIECES");
var length = indexOf + 6;

Tests:

substring
var t_substring = inputText.substring(indexOf,length);
slice
var t_substring = inputText.slice(indexOf,length);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
slice

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 break down what's being tested in this benchmark.

**What is being tested?**

The benchmark is testing two different ways to extract a substring from a string: using the `substring()` method and using the `slice()` method.

**Options compared**

Two options are being compared:

1. **`substring(indexOf, length)`**: This method creates a new string by extracting a section of the original string, starting at the specified `indexOf` index and ending at the specified `length` index.
2. **`inputText.slice(indexOf, length)`**: The `slice()` method also extracts a section of the string, but it returns a new array (or string in older browsers) instead of a new string object.

**Pros and Cons**

Here are some pros and cons of each approach:

**`substring()`**

Pros:

* Can be more readable and easier to understand for simple substring extraction cases.
* Some older browsers may not support `slice()`, so it's a fallback option.

Cons:

* Can create intermediate strings or arrays, which can lead to performance issues in certain situations.
* May not be as efficient as `slice()` in modern browsers.

**`slice()`**

Pros:

* Returns an array (or string) without creating intermediate objects, making it more efficient.
* Is the recommended method for substring extraction in modern JavaScript.

Cons:

* Can be less readable and more difficult to understand for simple cases.
* Some older browsers may not support `slice()`, so it's a fallback option.

**Library**

None of these options use a library specifically. They are built-in methods of the String prototype in JavaScript.

**Special JS feature or syntax**

There is no special feature or syntax being used here, just standard JavaScript methods.

Now, let's consider some other alternatives:

* **`substr()`**: This method also extracts a section of a string, but it returns an array (or string) instead of creating intermediate objects. It's similar to `slice()`, but has some differences in behavior and syntax.
* **Regular expressions**: You could use regular expressions to extract a substring, but this would likely be slower and more complex than using the built-in methods.

It's worth noting that the choice between `substring()` and `slice()` ultimately depends on your specific requirements and performance needs. If you need simple substring extraction with minimal overhead, `substring()` might be sufficient. However, if you need efficient substring extraction or plan to use these methods in a performance-critical section of code, `slice()` is likely the better choice.

Related benchmarks:

CUSTOM substring vs slice (version: 0)

Comparing performance of: substring vs slice

Created: 2 years ago by: Guest

Jump to the latest result

substring

slice

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):