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Split Pop vs Slice lastIndexOf
(version: 0)
Comparing performance of:
Split Pop vs Slice LastIndexOf
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
for (var i = 0; i < 1000 * 10; i++) { name = name + '.' + i; }
Tests:
Split Pop
name.split('.').pop();
Slice LastIndexOf
name.slice(name.lastIndexOf('.'), name.length);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Split Pop
Slice LastIndexOf
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser/OS:
Chrome 134 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=594281" width="100%" height="500px"></iframe>
Slice LastIndexOf
2.4M/s
Split Pop
3K/s
View exact numbers
Test name
Executions per second
✓
Slice LastIndexOf
2,391,152 Ops/sec
Split Pop
2,697 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark and explain what's being tested, compared, and other considerations. **Benchmark Definition** The provided JSON defines two benchmarks: `Split Pop` and `Slice LastIndexOf`. The benchmark aims to compare the performance of two different approaches to extract the last part of a string that contains a specified separator (`.`). **Options Compared** Two options are compared: 1. **`name.split('.').pop()`**: This approach uses the `split()` method, which splits a string into an array of substrings based on a specified separator. The `pop()` method is then used to extract the last element from the resulting array. 2. **`name.slice(name.lastIndexOf('.'), name.length)`**: This approach uses the `slice()` method, which extracts a section of a string. In this case, it starts at the index of the last occurrence of the separator (`.`) and extracts the substring up to the end of the original string. **Pros and Cons** 1. **`name.split('.').pop()`**: * Pros: This approach is concise and easy to read. * Cons: It may have poor performance due to creating an intermediate array, which can be slow for large strings. 2. **`name.slice(name.lastIndexOf('.'), name.length)`**: * Pros: This approach avoids creating an intermediate array, making it potentially faster. * Cons: The code is slightly more complex and harder to read. **Library Used** The `split()` and `slice()` methods are built-in JavaScript functions, which means they don't rely on any external libraries. **Special JS Feature or Syntax** There's no specific JavaScript feature or syntax being tested in this benchmark. However, the use of template literals (`name = name + '.' + i;`) is a relatively modern JavaScript feature introduced in ECMAScript 2015 (ES6). **Other Considerations** When writing benchmarks like this, it's essential to consider factors such as: * **Input size**: The benchmark uses strings with varying lengths, which can affect performance. * **Browser and environment variations**: The test is run on Firefox 113, but other browsers or environments might behave differently. * **Optimization opportunities**: Depending on the specific use case, there may be opportunities to optimize one approach over the other. **Other Alternatives** If you're interested in exploring alternative approaches, here are a few options: 1. Use `String.prototype.substring` instead of `slice()`. 2. Implement a custom separator function that can handle more complex cases. 3. Consider using a different data structure, such as an array or object, to store the string parts. Keep in mind that these alternatives might not necessarily outperform the existing approaches, but they could provide new insights into performance characteristics.
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