is-nan

Determine if a value is NaN.

Usage

    npm install @typeforce/is-nan --save   # Install package via NPM

    import { expect } from "chai";
    import isNaN from "@typeforce/is-nan";

    expect(isNaN(Math.sqrt(-1))).to.be.true;
    expect(isNaN(0 / 0)).to.be.true;
    expect(isNaN(NaN)).to.be.true;

    expect(isNaN(undefined)).to.be.false;
    expect(isNaN(null)).to.be.false;
    expect(isNaN(42).to.be.false;

This package contains TypeScript type declarations.

Content Delivery Network (CDN)

This package can be imported via unpkg as demonstrated below.

    <script src="https://unpkg.com/@typeforce/is-nan/dist/index.min.js"></script>
    <script type="application/javascript">
        var x = 0 / 0;
        if (isNaN(x)) {
            // `x` is `NaN`!
        }
    </script>

Build & Test

When building the project, a folder named dist/ will be created if it does not already exist, where the compiled code will be outputted to. Type declaration files will also be generated and outputted to the dist/ folder.

A minified Javascript version of the entire project will be generated and outputted to dist/index.min.js.

    npm install     # Installs dependencies.
    npm run build   # Build the project.

This package uses Gulp for building, and Chai and Mocha for testing.

    npm test       # Run tests.

License

Refer to the LICENSE file for license information.