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endsWith vs slice equality
(version: 0)
Comparing performance of:
endsWith vs slice equality
Created:
one year ago
by:
Registered User
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Tests:
endsWith
'foo/bar/index'.endsWith('/index')
slice equality
'foo/bar/index'.slice(-6) === '/index'
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
endsWith
slice equality
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_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Browser/OS:
Chrome 127 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=537383" width="100%" height="500px"></iframe>
endsWith
24.5M/s
slice equality
22.5M/s
View exact numbers
Test name
Executions per second
✓
endsWith
24,545,938 Ops/sec
slice equality
22,547,412 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided JSON benchmark definitions and explain what's being tested, compared, and the pros and cons of each approach. **Benchmark Definitions:** We have two test cases: 1. `endsWith`: Tests if `'foo/bar/index'` ends with `'index'`. 2. `slice equality`: Tests if slicing `'foo/bar/index'` to the last 6 characters (`'-6'`) returns a string equal to `'/'`. **Options being compared:** In both test cases, we're comparing two approaches: 1. **endsWith**: Uses the `endsWith()` method. 2. **slice equality**: Slices the string using the `-6` index and compares it to `'/'` using the `===` operator. **Pros and Cons of each approach:** 1. **endsWith()** * Pros: + More readable and expressive code + Fewer occurrences of `==` or `===`, which can be less error-prone * Cons: + May be slower due to the overhead of a method call + Not as efficient for large strings, since it needs to traverse the entire string to find the end index 2. **Slice equality** * Pros: + Faster execution time for large strings, since only a slice of the original string is created and compared + Can be more efficient in terms of memory usage * Cons: + Less readable and expressive code, especially for complex slicing scenarios + More occurrences of `==` or `===`, which can increase errors **Library:** There is no explicit library mentioned in the provided JSON. However, the use of `endsWith()` suggests that it might be a built-in method on strings in JavaScript. **Special JS feature or syntax:** None mentioned. **Other considerations:** When choosing between these approaches, consider the trade-off between code readability and performance: * If you prioritize readability and are working with relatively small to medium-sized strings, `endsWith()` might be the better choice. * If you're dealing with large strings or need to optimize for execution time, `slice equality` could be a better option. **Other alternatives:** Some alternative approaches could include using regular expressions (e.g., `\b$` matches the end of the string) or leveraging browser-specific optimizations (e.g., in Safari). However, these approaches would likely introduce additional complexity and might not provide significant performance gains over the current `endsWith()` and `slice equality` methods.
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