The JavaScript utility package is-number provides a quick and robust check to determine if a number or a string value could be interpreted as a finite number. It's especially useful for handling and validating user inputs, regex matches, and other situations where a value might be a number in the context of your JavaScript code. Its discerning computation gives an extra layer of reliability and prevents possible bugs introduced by JavaScript's weak typing and implicit coercion behaviors, especially with edge cases.

How do you use is-number?

To start using is-number in your JavaScript project, you first need to install it using npm, the default package manager for the Node.js JavaScript runtime. Initiate the console and execute the command npm install --save is-number, which downloads the package and saves it as a dependency in your project.

Upon successful installation, you can import the function isNumber into your code by declaring the statement const isNumber = require('is-number');

To utilize isNumber, simply call it with the value you wish to check as the argument, like so: isNumber(value).

Here are some sample use-cases:

const isNumber = require('is-number');

console.log(isNumber(5e3));  // Outputs: true

console.log(isNumber('012'));  // Outputs: true

console.log(isNumber(NaN));  // Outputs: false

console.log(isNumber('foo'));  // Outputs: false

Where are the is-number docs?

You can find the detailed documentation of is-number directly on its official GitHub repository at https://github.com/jonschlinkert/is-number. The README.md file in the repository includes a comprehensive description, usage examples, performance benchmarks, and other relevant information about the package. If you're interested in contributing to the project or want to run the unit tests locally, you'll also find instructions in the README. Learn more about is-number and get involved with its development on GitHub!