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Enum As Param Type In Jsdoc

If you've ever wondered how to use an enum as a parameter type in JSDoc, you're in the right place. This handy feature can help you better document your JavaScript functions by specifying the expected values for an argument.

To start using an enum as a param type in JSDoc, you first need to define your enum. In JavaScript, there isn't a built-in enum type like in some other programming languages, but you can create one using object literals. Here's an example of how you can define an enum:

Javascript

/**
 * @enum {string}
 */
const Fruit = {
  APPLE: 'apple',
  BANANA: 'banana',
  ORANGE: 'orange'
};

In this example, we've created an enum called `Fruit` that consists of three string values: `'apple'`, `'banana'`, and `'orange'`. The `@enum {string}` JSDoc tag indicates that `Fruit` is an enum with string values.

Next, let's see how you can use this enum as a parameter type in a JSDoc comment for a function:

Javascript

/**
 * Checks if the given fruit is a valid option.
 * @param {Fruit} fruit - The fruit to check.
 * @returns {boolean} Whether the fruit is valid.
 */
function isValidFruit(fruit) {
  return Object.values(Fruit).includes(fruit);
}

In this `isValidFruit` function, the `@param {Fruit} fruit` JSDoc tag specifies that the `fruit` parameter should be of type `Fruit`, which means it should be one of the enum values (`'apple'`, `'banana'`, or `'orange'`). The `@returns {boolean}` tag indicates that the function returns a boolean value.

By using enums as parameter types in JSDoc, you make your code more self-documenting and help IDEs and other tools provide better code intelligence and type checking. This can lead to fewer errors and improved code quality in your projects.

Remember that JSDoc is a tool to document your code, so make sure to keep your comments clear and meaningful. Enum as a param type in JSDoc is just one of the many features you can leverage to enhance the readability and maintainability of your JavaScript code.

In conclusion, using enums as parameter types in JSDoc is a powerful way to specify the allowed values for function arguments. By following the simple steps outlined in this article, you can improve the clarity and correctness of your JavaScript code. Start using enums in your JSDoc comments today and see the benefits for yourself!

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