Benchmark: lodash isnubmer vs typeof

HTML Preparation code:

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

Script Preparation code:

var x = 10000

Tests:

lodash
var y = _.isNumber(x)
typeof
var y = (typeof(x) === 'number')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
typeof

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark data and explain what is being tested.

**Benchmark Definition**

The first line, `var x = 10000`, creates a JavaScript variable `x` with an initial value of `10000`. This code snippet is used to prepare the environment for the benchmark tests.

The second line, `<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>`, includes the Lodash library in the HTML file. Lodash is a popular JavaScript utility library that provides functions for various tasks such as array manipulation, object manipulation, and more.

**Test Cases**

The benchmark has two test cases:

1. `var y = _.isNumber(x)`: This test case uses the Lodash `_.isNumber` function to check if the value of `x` is a number.
2. `var y = (typeof(x) === 'number')`: This test case uses the built-in JavaScript `typeof` operator to check if the value of `x` is a number.

**What is being tested?**

In essence, these two test cases are comparing the performance of:

1. Lodash's `_.isNumber` function
2. The built-in JavaScript `typeof` operator

The goal is to determine which approach is faster and more efficient for checking if a value is a number.

**Pros and Cons of each approach**

**Lodash's `_.isNumber` function:**

Pros:

* Convenient and readable syntax
* Can handle complex data types, including arrays and objects
* May be faster than a simple `typeof` check for certain inputs

Cons:

* Requires Lodash library to be included, which may add overhead
* May not be as efficient as a simple `typeof` check for numeric values

**Built-in JavaScript `typeof` operator:**

Pros:

* Lightweight and efficient
* Does not require any additional libraries or imports
* Works well for basic numeric checks

Cons:

* May return incorrect results for certain complex data types (e.g., arrays, objects)
* Can be slower than Lodash's `_.isNumber` function for very large inputs

**Other considerations**

* The test cases are comparing the execution speed of each approach. However, it's worth noting that this comparison may not reflect real-world usage scenarios.
* The Lodash library is included in the HTML file using a script tag, which may add overhead to the benchmark.

**Alternatives**

If you wanted to rewrite these test cases without using Lodash or the `typeof` operator, here are some alternatives:

1. Use the `Number.isInteger` function (available in modern browsers and Node.js) to check if a value is an integer.
2. Use a simple JavaScript implementation of a type-checking function, such as:
```javascript
function isNumber(x) {
  return typeof x === 'number' && !isNaN(x);
}
```
Keep in mind that these alternatives may not be as efficient or convenient as using Lodash's `_.isNumber` function or the built-in `typeof` operator.

Related benchmarks:

lodash isnubmer vs typeof (version: 0)

Comparing performance of: lodash vs typeof

Created: 3 years ago by: Guest

Jump to the latest result

lodash

typeof

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):