@primitive/is-null
v1.1.0
Published
Determine if a value is `null`
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4
Readme
is-null
Determine if a value is null
.
Usage
npm install @primitive/is-null --save # Install package via NPM
yarn add @primitive/is-null # Install package via Yarn
import { expect } from "chai";
import isNull from "@primitive/is-null";
expect(isNull(null)).to.be.true;
expect(isNull(undefined)).to.be.false;
expect(isNull(42)).to.be.false;
This package contains TypeScript type declarations. Furthermore, the package uses TypeScript type guards to allow type inference to influence intellisense.
if (isNull(x)) {
// IntelliSense now knows `x` is `null`.
let y: null = x;
}
Content Delivery Network (CDN)
This package can be imported via unpkg as demonstrated below.
<script src="https://unpkg.com/@primitive/is-null/dist/index.min.js">
<script type="application/javascript">
var x = null;
if (isNull(x)) {
// `x` is `null`!
}
</script>
Build & Test
This package uses Gulp for building, and Chai and Mocha for testing.
npm install # Installs dependencies.
npm run build # Build the project.
npm test # Run tests.
License
Refer to the LICENSE
file for license information.