Benchmark: first upper case extended 1

Script Preparation code:

const example = 'there is no spoon'

Tests:

slice charAt
const firstUpper = (string_)=>(string_.charAt(0).toUpperCase() + string_.slice(1)); const result = firstUpper(example);
substr charAt
const firstUpper = (string_)=>(string_.charAt(0).toUpperCase() + string_.substr(1)); const result = firstUpper(example);
substring charAt
const firstUpper = (string_)=>(string_.charAt(0).toUpperCase() + string_.substring(1)); const result = firstUpper(example);
slice
const firstUpper = (string_)=>(string_[0].toUpperCase() + string_.slice(1)); const result = firstUpper(example);
substr
const firstUpper = (string_)=>(string_[0].toUpperCase() + string_.substr(1)); const result = firstUpper(example);
substring
const firstUpper = (string_)=>(string_[0].toUpperCase() + string_.substring(1)); const result = firstUpper(example);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice charAt
substr charAt
substring charAt
slice
substr
substring

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0

Browser/OS: Firefox 128 on Linux

View result in a separate tab

Test name	Executions per second
slice charAt	1413102592.0 Ops/sec
substr charAt	1414611456.0 Ops/sec
substring charAt	1577564800.0 Ops/sec
slice	1642171648.0 Ops/sec
substr	1387212416.0 Ops/sec
substring	1408095744.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 8 months ago):

LLMs can make mistakes. Check important info.

The provided benchmark focuses on comparing the performance of different JavaScript string manipulation functions: `slice`, `substr`, and `substring`. The benchmark specifically measures how these methods perform when converting the first character of a string to upper case while keeping the rest of the string intact.

### Options Compared
1. **`charAt` and `slice` Combination**:
   ```javascript
   string_.charAt(0).toUpperCase() + string_.slice(1);
   ```
   This approach grabs the first character using `charAt`, capitalizes it, and concatenates it with the remaining substring obtained using `slice`.

2. **`charAt` and `substr` Combination**:
   ```javascript
   string_.charAt(0).toUpperCase() + string_.substr(1);
   ```
   Similar to the previous case, this one uses `substr`, which retrieves a portion of the string starting from the specified index.

3. **`charAt` and `substring` Combination**:
   ```javascript
   string_.charAt(0).toUpperCase() + string_.substring(1);
   ```
   This employs the `substring` method instead of `substr`, achieving the same objective but utilizing a different string manipulation method.

4. **Using Array Indexing with `slice`**:
   ```javascript
   string_[0].toUpperCase() + string_.slice(1);
   ```
   This approach accesses the first character directly through array-like indexing, then capitalizes it and combines it with the sliced remainder.

5. **Using Array Indexing with `substr`**:
   ```javascript
   string_[0].toUpperCase() + string_.substr(1);
   ```
   Like the prior example, it uses indexing alongside `substr`.

6. **Using Array Indexing with `substring`**:
   ```javascript
   string_[0].toUpperCase() + string_.substring(1);
   ```
   This final option also utilizes indexing with `substring` to achieve the desired result.

### Pros and Cons of Each Approach

1. **`charAt` + `slice`, `substr`, or `substring`**:
   - **Pros**:
     - Clear and expressive: Using `charAt` conveys intent clearly.
     - Compatible across most browsers and JavaScript environments.
   - **Cons**:
     - Slightly slower than direct index access due to function call overhead.

2. **Array Indexing + `slice`, `substr`, or `substring`**:
   - **Pros**:
     - Generally faster because accessing a character using indexing is straightforward and does not involve a function call.
   - **Cons**:
     - Slightly less intuitive and less compatible with older JavaScript environments that may not fully support array-like string indexing.

### Other Considerations
- **Performance**: The benchmark results show varying performance, with the variant using `slice` combined with character indexing generally performing the best, indicating that function call overhead can influence speed.
- **Browser Variability**: The performance may vary across different browsers or versions, so results should be interpreted in the context of the benchmarking environment.
  
### Alternatives
- Other alternatives for converting the first character to uppercase could include using regular expressions or built-in string manipulation libraries, like Lodash or Underscore.js.
- For extensive string manipulation tasks, dedicated libraries tailored for specific performance need or feature set might be beneficial, but for simple cases like this, the native methods are usually sufficient.

In conclusion, this benchmark provides insight into the nuances of JavaScript string manipulation methods, particularly in the context of performance when combined with capitalization.

Related benchmarks:

first upper case extended 1 (version: 1)

Compares slice, substr and substring to each other when there is only a start index

Comparing performance of: slice charAt vs substr charAt vs substring charAt vs slice vs substr vs substring

Created: 8 months ago by: Guest

Jump to the latest result

slice charAt

substr charAt

substring charAt

slice

substr

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 8 months ago):