Benchmark: Performance Test: substring vs substr vs slice 5

Script Preparation code:

var string = "I am the god of hellfire, and I bring you..."

Tests:

slice
var substring = string.trim().slice(0, -1);
substring
var substring = string.substring(0, string.length-1);
...
var substring = [...string].slice(0,string.length-1).join('')

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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Let's dive into the benchmarking test.

**Benchmark Test**

The test measures the performance of three different approaches to extract the last character from a string:

1. `substring` method
2. `slice` method
3. A custom implementation using the spread operator (`...`) and `join()` method.

**Comparison Options**

The options being compared are:

* `substring`: This is a built-in JavaScript method that returns a new string containing the characters before or at the specified index.
* `slice`: This is another built-in JavaScript method that creates a new array with a subset of characters from an existing array (or string).
* Custom implementation using `...` and `join('')`.

**Pros and Cons**

Here's a brief summary of each approach:

* `substring`: Pros: Simple, widely supported. Cons: Creates a new string object, which can lead to performance issues with large strings.
* `slice`: Pros: Creates an array, which is optimized for performance. Cons: Requires converting the result back to a string using `join('')`.
* Custom implementation using `...` and `join('')`: Pros: Efficient, avoids creating new objects. Cons: May not be as readable or maintainable due to the use of spread operator and `join()` method.

**Library Usage**

None of the test cases use any external libraries.

**Special JavaScript Features/Syntax**

The custom implementation uses the spread operator (`...`), which is a relatively recent feature introduced in ECMAScript 2015 (ES6). It allows for concise creation of arrays by spreading elements from an existing array or object. The `join('')` method is also a part of ES6.

**Other Considerations**

The test focuses on the performance difference between these three approaches, which is likely due to the overhead of creating new objects versus using optimized built-in methods like `slice`.

If you're looking for alternatives, some other options to consider are:

* Using a different string manipulation method, such as `indexOf()` and `substr()`, which might be more suitable for certain use cases.
* Investigating other JavaScript engines or browsers that may exhibit different performance characteristics due to their specific optimizations or implementations of these methods.

Overall, this benchmark test provides valuable insights into the performance differences between various string manipulation approaches in JavaScript.

Related benchmarks:

Performance Test: substring vs substr vs slice 5 (version: 0)

Comparing performance of: slice vs substring vs ...

Created: 3 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):