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startsWith + split VS slice + indexOf
(version: 0)
Comparing performance of:
startsWith + split vs slice + indexOf
Created:
5 years ago
by:
Registered User
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Script Preparation code:
tests = ['v420', '420', 'v420.06.28', 'elonmusk']
Tests:
startsWith + split
tests.forEach((label) => { const labelWithoutV = label.startsWith('v') ? label.split('v')[1] : label console.log(labelWithoutV) })
slice + indexOf
tests.forEach((label) => { const labelWithoutV = label.slice(label.indexOf('v') + 1) console.log(labelWithoutV) })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
startsWith + split
slice + indexOf
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0
Browser/OS:
Firefox 147 on Windows
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<iframe src="https://measurethat.net/Embed?id=625379" width="100%" height="500px"></iframe>
Test name
Executions per second
startsWith + split
51847.6 Ops/sec
slice + indexOf
54704.8 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **Benchmark Definition** The provided JSON defines two test cases: `startsWith + split` and `slice + indexOf`. The benchmark aims to compare the performance of two approaches for removing the prefix "v" from strings. **Options Compared** Two options are compared: 1. **startsWith + split**: This approach uses the `startsWith()` method to check if the string starts with "v", and then splits the string using `split('v')` to remove the prefix. 2. **slice + indexOf**: This approach uses the `indexOf()` method to find the index of "v" in the string, and then slices the string from that index using `slice(index)` to remove the prefix. **Pros and Cons** **.startsWith + split** Pros: * Readable and easy to understand code * Does not rely on indexing or slicing, which can be slow for large strings Cons: * May lead to unnecessary splits if "v" is not present in the string * Can be slower than `slice + indexOf` due to the overhead of splitting **slice + indexOf** Pros: * Efficiently removes the prefix without creating a new string * Avoids unnecessary work by only slicing from the index of "v" Cons: * Requires indexing and slicing, which can be slow for large strings * Less readable than `startsWith + split` **Library Usage** There is no explicit library usage in this benchmark. However, it's worth noting that the `indexOf()` method is a built-in JavaScript method. **Special JS Features/Syntax** None mentioned in this specific benchmark. However, if you're interested in exploring other features or syntax, here are some examples: * `let` and `const` declarations (as opposed to traditional `var`) * Arrow functions (`=>`) * Template literals (`${}`) **Other Alternatives** Some alternative approaches could be: 1. **Using a regular expression**: `s.replace(/^v/, '')` 2. **Using `match()` method**: `s.match(/^v/)[0]` (then slice the remaining string) 3. **Using `substring()` method**: `s.substring(s.indexOf('v') + 1)` Keep in mind that these alternatives might have their own pros and cons, which would depend on the specific use case. In conclusion, the benchmark provides a clear comparison between two approaches for removing prefixes from strings. The choice of approach ultimately depends on readability, performance, and personal preference.
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slice vs substr vs substring vs split
slice vs substring (with end index)
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