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(version: 0)
Compare methods for testing string's beggining character.
Comparing performance of:
sw vs slice vs shortx
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
const str = 'hey can i be in '; const shortx = 'hey c'; const noop = Function.prototype;
Tests:
sw
const str = 'hey can i be in ';const shortx = 'hey c';const noop = Function.prototype;if (str.startsWith(`hey can i be in `)) noop();
slice
const str = 'hey can i be in ';const shortx = 'hey c';const noop = Function.prototype;if (str.slice(16) === `hey can i be in `) noop();
shortx
const str = 'hey can i be in ';const shortx = 'hey c';const noop = Function.prototype;if (shortx.slice(16) === `hey can i be in `) noop();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
sw
slice
shortx
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares three different ways to check if the beginning of a string matches a specific substring: **1. `startsWith()` Method:** - **Description:** The `startsWith()` method directly checks if a string starts with a specified prefix. It returns `true` if it does, and `false` otherwise. - **Pros:** Concise, readable, and designed specifically for this purpose. **2. `slice()` Method:** - **Description:** This method extracts a portion of a string starting from a specific index. In this case, we're extracting the substring starting from index 16 (assuming it's the intended position) and comparing it to our target prefix. - **Pros:** Works for more complex string manipulations, potentially adaptable to different lengths of prefixes. **3. Comparing `shortx` with the Entire String:** - **Description:** This approach appears flawed. It compares a substring (`shortx`) with the entire original string, which is unlikely to be accurate or efficient. **Considerations:** * **Efficiency:** For simple prefix checks, `startsWith()` is generally the most performant. `slice()` can be slower if used repeatedly for similar comparisons. * **Readability:** `startsWith()` is by far the most readable and expresses the intent clearly. **Alternatives:** * Regular Expressions: While powerful, they are often more complex to write and may not be as efficient for simple prefix checks. Let me know if you have any other questions about this benchmark or want to explore other benchmarking scenarios!
Related benchmarks:
char index vs charAt()
char index vs charAt() for non-zero index
char index vs charAt() vs slice() with Object
char index vs charAt() for the first character
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