Benchmark: slice substring trim both ends

Script Preparation code:

var example = 'there is no spoon'

Tests:

slice
var result = example.slice(1,-1)
substr
var result = example.substring(1, example.length-1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
slice	270040800.0 Ops/sec
substr	264293904.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark you are looking at compares two JavaScript string methods: `slice` and `substring`. Both methods are used for extracting a portion of a string, but they do so in slightly different ways. Here’s an overview of what’s being tested, the pros and cons of each approach, and other considerations.

### Benchmark Overview:

- **Purpose**: The benchmark aims to measure the performance of two string manipulation techniques: `slice` and `substring`. In this specific case, it trims one character from both ends of the string `'there is no spoon'`.

### Test Cases:

1. **`slice` Method**:
   - **Benchmark Definition**: `var result = example.slice(1, -1)`
   - This method extracts a section of the string starting at index 1 and ending at one character before the last character (`-1` indicates the last character). 
   - **Pros**:
     - Supports negative indices, which can be convenient.
     - Generally considered more versatile as it can accept both positive and negative indices.
   - **Cons**:
     - Slightly more complex than `substring` due to its handling of negative indices.

2. **`substring` Method**:
   - **Benchmark Definition**: `var result = example.substring(1, example.length - 1)`
   - This method extracts characters between the specified indices (from 1 to `example.length - 1`, which is the same as saying up to the last character).
   - **Pros**:
     - Simpler to understand for basic use cases, as it only accepts positive indices.
     - Might be less error-prone due to its simplified interface.
   - **Cons**:
     - Does not support negative indices; for instance, it cannot easily extract characters from the end of the string without knowing the string length beforehand.

### Performance Results:

The benchmark results show the number of executions per second for each method, which indicates their performance in this specific environment (Chrome 134 on a Windows Desktop):

- **`slice`**: 205,809,056 executions per second.
- **`substring`**: 187,596,448 executions per second.

### Conclusion:

- **Performance**: In this instance, the `slice` method is faster than the `substring` method. This may be significant for applications dealing with large strings or requiring high-efficiency operations.
  
- **Other Alternatives**: 
   - **`substr`**: Despite not being included in this benchmark, it’s another related method where you specify the start index and the length of the substring. It has been deprecated in favor of `slice` and `substring`, so it's generally recommended to use the latter two.
   - **Regular Expressions**: For more complex string manipulations, regular expressions can be a powerful alternative, albeit with complexity and potentially lower performance depending on the use case.
   - **String.prototype.trim()**: While specifically not tested here, if your goal is purely to trim whitespace from ends, string methods like `trim()` could be applicable in other contexts.

In conclusion, the choice between `slice` and `substring` may depend on specific requirements regarding negative indexing flexibility versus ease of understanding. Performance may vary based on the JavaScript engine optimizations, but in this test, `slice` demonstrates superior performance for the specific operation being benchmarked.

Related benchmarks:

slice substring trim both ends (version: 1)

Compares slice and substring to each other when trimming 1 character from both ends of a string

Comparing performance of: slice vs substr

Created: one year ago by: Guest

Jump to the latest result

slice

substr

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):