Benchmark: isString Test - MeasureThat.net

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

function isString(input) {
    if (input === '') return true;

    if (input && typeof input.valueOf() === 'string') {
        return true;
    }

    return false;
}

var emptyString = '';
var nullString = null;
var normalString = 'hello';
var array = ['hello'];
var otherObject = {};
var objectString = new String('hello');

Tests:

lodash
for (let i = 0; i < 1000; i++) { _.isString(emptyString); _.isString(nullString); _.isString(normalString); _.isString(array); _.isString(otherObject); _.isString(objectString); }
replacement
for (let i = 0; i < 1000; i++) { isString(emptyString); isString(nullString); isString(normalString); isString(array); isString(otherObject); isString(objectString); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
replacement

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash	12070.0 Ops/sec
replacement	43333.5 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark tests the performance of two different approaches to determining if a given value is a string in JavaScript:

**1. Using Lodash's `_.isString()` function:** This approach relies on the Lodash library, a popular collection of utility functions for JavaScript.  The `_.isString()` function efficiently checks if a value is a string and returns `true` or `false`.

* **Pros:** Lodash is well-maintained, widely used, and provides optimized implementations of many common JavaScript operations. Using existing libraries like Lodash can save development time and potentially improve performance.
   * **Cons:**  Adding an external dependency like Lodash might increase the size of your project and introduce potential compatibility issues.

**2. Implementing a custom `isString()` function:** This approach defines a simple JavaScript function to check if a value is a string. It iterates through various input types (`emptyString`, `nullString`, `normalString`, an array, an object, and a String object) and determines whether each one represents a string using type checking and the `valueOf()` method.

* **Pros:**  Complete control over the implementation and no external dependencies. You can tailor the function to your specific needs and potentially optimize it further.
   * **Cons:** Requires more manual coding effort compared to using an existing library. The performance might not be as optimized as Lodash's `_.isString()` function, depending on its implementation.

**Other Considerations:**

* **Benchmarking Environment:**  The results of this benchmark are influenced by the hardware and software environment in which it is run. Different browsers, operating systems, and CPU architectures can affect performance.

Let me know if you have any other questions!

Related benchmarks:

isString Test (version: 0)

Comparing performance of: lodash vs replacement

Created: 5 years ago by: Registered User

Jump to the latest result

lodash

replacement

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):