Benchmark: Performance Test: substring vs substr vs slice: 3 shuffled

Script Preparation code:

var string = "Hello, world! This is the greatest benchmark of the world!"

Tests:

slice
var substring = string.slice(3, 10);
substring
var substring = string.substr(3, 7);
substr
var substring = string.substring(3, 10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substring
substr

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The benchmark is designed to measure the performance of three different string slicing methods in JavaScript: `substring`, `substr`, and `slice`. The test case creates a fixed-length string and shuffles it, then measures the execution time of each method to extract a substring from 3 to 10 characters.

**Options Compared**

The options compared are:

1. `substring`
2. `substr`
3. `slice`

Each option has its own pros and cons:

* `substring`:
	+ Pros: widely supported, provides a clear syntax for extracting substrings.
	+ Cons: may be slower than other methods due to the overhead of creating a new string object.
* `substr`:
	+ Pros: simple and concise syntax, optimized for performance in older browsers.
	+ Cons: less readable than `substring`, may not work as expected in modern browsers.
* `slice`:
	+ Pros: highly optimized for performance, provides a fast and efficient way to extract substrings.
	+ Cons: less readable than other methods, may require additional setup (e.g., specifying the start and end indices).

**Library and Special JS Features**

In this benchmark, the test case uses the `slice` method, which is implemented in the JavaScript engine itself. There are no external libraries involved.

As for special JS features, there aren't any notable ones mentioned in the provided code. However, if we were to consider other methods that might be compared, some examples include:

* Using `Array.prototype.slice()` on a string (not recommended, as it's not designed for this purpose)
* Using a library like Lodash or Underscore.js for string manipulation
* Using modern JavaScript features like `String.prototype.at()` or `String.prototype.match()`

**Other Alternatives**

Some alternative approaches to measuring string slicing performance include:

1. **Using a different data structure**: Instead of using strings, you could test the performance of other data structures, such as arrays or buffers.
2. **Adding noise to the input**: Introducing random characters or noise to the input string can help simulate real-world scenarios and make the benchmark more representative.
3. **Testing with different browser engines**: Measuring the performance of each method across multiple browser engines (e.g., Firefox, Chrome, Safari) can provide a more comprehensive understanding of the results.
4. **Using a more modern JavaScript version**: Testing the performance of each method in a newer JavaScript version (e.g., ES6+) can help identify any regressions or improvements.

Keep in mind that these alternative approaches might require significant modifications to the benchmark code and may not be feasible for all use cases.

Related benchmarks:

Performance Test: substring vs substr vs slice: 3 shuffled (version: 0)

Comparing performance of: slice vs substring vs substr

Created: 6 years ago by: Guest

Jump to the latest result

slice

substring

substr

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):