how to use the isnull function from the underscore library in javascript

To use the isnull function from the Underscore library, you first need to include Underscore in your project. You can download it from the Underscore website or use a package manager like NPM or Yarn.

Once Underscore is included in your project, you can call the _.isnull function to determine if a value is null or not. Here's an example:

index.tsx
const value = null;
const result = _.isnull(value); // Returns true
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In this example, value is set to null and _.isnull is called with that value as its parameter. The function returns true because null is considered a "nullish" value.

You can also use _.isNull if you prefer camelCase naming conventions:

index.tsx
const value = null;
const result = _.isNull(value); // Returns true
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Either way, the function checks if the value is strictly equal to null and returns a boolean value indicating whether it is null or not.