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Capitalize
(version: 0)
Comparing performance of:
1 vs 2 vs 3
Created:
9 years ago
by:
Guest
Go to the latest result
Tests:
1
function capitalizeFirstLetter(string) { return string[0].toUpperCase() + string.slice(1); } capitalizeFirstLetter('string');
2
function capitalizeFirstLetter(s) { return s[0].toUpperCase() + s.substr(1); } capitalizeFirstLetter('string');
3
function capitalizeFirstLetter(s) { s.replace(s[0], s[0].toUpperCase()); } capitalizeFirstLetter('string');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
1
2
3
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
7 months ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.127 Safari/537.36 OPR/60.3.3004.55692
Browser/OS:
Opera 60 on Linux
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<iframe src="https://measurethat.net/Embed?id=622973" width="100%" height="500px"></iframe>
2
7.1M/s
1
6.7M/s
3
296K/s
View exact numbers
Test name
Executions per second
✓
2
7,144,399 Ops/sec
1
6,713,478 Ops/sec
3
295,866 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript benchmarking on MeasureThat.net. **Benchmark Definition JSON** The provided Benchmark Definition JSON represents a simple JavaScript function that capitalizes the first letter of a given string. The definition includes three different implementations: 1. `capitalizeFirstLetter(string) { return string[0].toUpperCase() + string.slice(1); }` 2. `capitalizeFirstLetter(s) { return s[0].toUpperCase() + s.substr(1); }` 3. `capitalizeFirstLetter(s) { s.replace(s[0], s[0].toUpperCase()); }` These implementations differ in their approach to capitalizing the first letter of the input string. **Options Comparison** The three implementations compared are: 1. **String slicing**: The first implementation uses `string.slice(1)` to extract the substring starting from the second character, and then concatenates it with the uppercase first character using `toUpperCase()`. 2. **String substr**: The second implementation uses `s.substr(1)` to achieve the same result as string slicing. 3. **String replacement**: The third implementation uses the `replace()` method to replace the first character of the input string with its uppercase equivalent. **Pros and Cons** Here's a brief summary of the pros and cons of each approach: * **String Slicing (1)**: + Pros: Simple, efficient, and concise. + Cons: May not work as expected for non-ASCII characters or strings containing newline characters. * **String Substr (2)**: + Pros: Similar to string slicing, but with a slightly different syntax. + Cons: May not be as efficient due to the use of `substr()` method, which can lead to slower execution times. * **String Replacement (3)**: + Pros: Works well for all types of strings, including non-ASCII characters and newline characters. + Cons: Can be less efficient than string slicing or substr due to the overhead of the `replace()` method. **Library Usage** None of the implementations use any external libraries. However, it's worth noting that some JavaScript engines may provide additional optimizations or features for certain strings, such as Unicode support. **Special JS Feature/Syntax** There are no special JavaScript features or syntax used in these examples. The focus is on simple string manipulation and optimization techniques. **Other Alternatives** If you're interested in exploring alternative approaches, here are a few options: * **Regex**: You could use regular expressions to capitalize the first letter of the input string. * **String method**: Some JavaScript engines provide additional string methods that can be used for this purpose, such as `toUpperCase()` and `slice()`. * **Built-in functions**: Modern JavaScript provides built-in functions like `String.prototype.charAt()` and `String.prototype.toUpperCase()` that can be used to achieve similar results. Keep in mind that the choice of approach ultimately depends on your specific use case, performance requirements, and personal preference.
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