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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
Go to the latest result
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>
Run tests (2)
Previous results
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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
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<iframe src="https://measurethat.net/Embed?id=604528" width="100%" height="500px"></iframe>
slice
270.0M/s
substr
264.3M/s
View exact numbers
Test name
Executions per second
✓
slice
270,040,800 Ops/sec
substr
264,293,904 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated one year ago):
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.
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