Benchmark: slice vs substr vs substring (with no end index, and start index 1)

Script Preparation code:

var example = '#laksjdlaj sldkjasl djalsjd alskjd laj'

Tests:

slice
var result = example.slice(1)
substr
var result = example.substr(1)
substring
var result = example.substring(1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
substring

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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**Overview of the Benchmark**

The provided benchmark compares the performance of three JavaScript methods: `slice()`, `substr()`, and `substring()` when used to extract a substring from a given string, starting from an index of 1 and stripping the first character.

**Methods Comparison**

The benchmark tests the three methods by calling each one with the same input:

```javascript
var example = '#laksjdlaj sldkjasl djalsjd alskjd laj';
```

Each method is called with a different starting index, which only affects the `substring()` and `substr()` methods. The `slice()` method always starts from the first character.

**Options Compared**

The benchmark compares the following options:

1. **`slice(start, end)`**: This method extracts a substring from the original string, starting from the specified `start` index and ending at the `end` index (exclusive). Since only `start=1`, it effectively extracts the substring starting from the second character.
2. **`substr(start)`**: This method extracts a substring from the original string, starting from the specified `start` index. The length of the extracted substring is determined by the next available whitespace character in the string (if found) or until the end of the string. In this case, it only needs to start from the second character.
3. **`substring(start)`**: This method extracts a substring from the original string, starting from the specified `start` index and ending at the end of the string.

**Pros and Cons**

*   **`slice()`**: Pros:
    *   It is generally faster because it avoids searching for the next whitespace character.
    *   It has better performance in non-ASCII characters.
*   **`substr()`**: Pros:
    *   It's simpler to implement, as it only needs to find the next whitespace character.
    *   However, its performance can be slower due to the extra search.
*   **`substring()`**: Pros:
    *   It's simple and intuitive.
    *   However, its performance is generally lower than `slice()`, especially in non-ASCII characters.

**Library Usage**

There are no libraries used in this benchmark. The three methods are native JavaScript functions.

**Special JS Feature or Syntax**

None mentioned.

**Other Considerations**

To further improve the accuracy of the results:

*   **Input Size**: Using larger input strings can help to better represent real-world scenarios.
*   **Multiple Browsers**: Testing multiple browsers, such as Chrome, Safari, and Edge, can provide a more comprehensive understanding of browser performance differences.
*   **Additional Features**: Additional features like null/undefined checks or handling edge cases (e.g., strings with no whitespace characters) could further add complexity to the benchmark.

**Alternatives**

Some possible alternatives for similar benchmarks:

*   Measure the performance of different string manipulation methods, such as `indexOf()`, `lastIndexOf()`, and `split()`.
*   Compare the performance of various regular expression patterns or methods like `match()` and `replace()`.
*   Test the performance of JavaScript's built-in date and time functions, like `Date.now()` and `Date.parse()`.

Related benchmarks:

slice vs substr vs substring (with no end index, and start index 1) (version: 0)

Compares slice, substr and substring to each other when there is only a start=1 index. Strip first character from the string.

Comparing performance of: slice vs substr vs substring

Created: 5 years ago by: Guest

Jump to the latest result

slice

substr

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):